Spring Network Model Implementation
See this page for the documentation of this contact model.
contactmodelrbsn.h
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// contactmodelrbsn.h
#include "contactmodel/src/contactmodelmechanical.h"
#ifdef RBSN_LIB
# define RBSN_EXPORT EXPORT_TAG
#elif defined(NO_MODEL_IMPORT)
# define RBSN_EXPORT
#else
# define RBSN_EXPORT IMPORT_TAG
#endif
namespace cmodelsxd {
using namespace itasca;
class ContactModelRBSN : public ContactModelMechanical {
public:
// Constructor: Set default values for contact model properties.
RBSN_EXPORT ContactModelRBSN();
// Destructor, called when contact is deleted: free allocated memory, etc.
RBSN_EXPORT virtual ~ContactModelRBSN();
// Contact model name (used as keyword for commands and FISH).
virtual QString getName() const { return "springnetwork"; }
// The index provides a quick way to determine the type of contact model.
// Each type of contact model in PFC must have a unique index; this is assigned
// by PFC when the contact model is loaded. This index should be set to -1
virtual void setIndex(int i) { index_=i;}
virtual int getIndex() const {return index_;}
// Contact model version number (e.g., MyModel05_1). The version number can be
// accessed during the save-restore operation (within the archive method,
// testing {stream.getRestoreVersion() == getMinorVersion()} to allow for
// future modifications to the contact model data structure.
virtual uint getMinorVersion() const;
// Copy the state information to a newly created contact model.
// Provide access to state information, for use by copy method.
virtual void copy(const ContactModel *c) override;
// Provide save-restore capability for the state information.
virtual void archive(ArchiveStream &);
// Enumerator for the properties.
enum PropertyKeys {
kwKn=1
, kwKs
, kwKrot
, kwFric
, kwBMul
, kwTMul
, kwSNMode
, kwSNF
, kwSNM
, kwSNS
, kwSNBS
, kwSNTS
, kwSNRMul
, kwSNRadius
, kwEmod
, kwKRatio
, kwDpNRatio
, kwDpSRatio
, kwDpMode
, kwDpF
, kwSNState
, kwSNTStr
, kwSNSStr
, kwSNCoh
, kwSNFa
, kwSNMCF
, kwSNSig
, kwSNTau
, kwSNArea
, kwUserArea
, kwRGap
, kwPForce
, kwPois
, kwPoisDiag
, kwSnCohRes
, kwSnDil
, kwSnDilZ
, kwSnNormDisp
, kwSnShearDisp
, kwSnCohDc
, kwSnHeal
, kwSnTenDc
, kwTenTable
, kwCohTable
, kwTablePos
, kwPorP
, kwStressNorm
};
// Contact model property names in a comma separated list. The order corresponds with
// the order of the PropertyKeys enumerator above. One can visualize any of these
// properties in PFC automatically.
virtual QString getProperties() const {
return "kn"
",ks"
",krot"
",fric"
",sn_bmul"
",sn_tmul"
",sn_mode"
",sn_force"
",sn_moment"
",sn_slip"
",sn_slipb"
",sn_slipt"
",sn_rmul"
",sn_radius"
",emod"
",kratio"
",dp_nratio"
",dp_sratio"
",dp_mode"
",dp_force"
",sn_state"
",sn_ten"
",sn_shear"
",sn_coh"
",sn_fa"
",sn_mcf"
",sn_sigma"
",sn_tau"
",sn_area"
",user_area"
",rgap"
",sn_pois_force"
",sn_pois"
",sn_non_diag"
",sn_cohres"
",sn_dil"
",sn_dilzero"
",sn_ndisp"
",sn_sdisp"
",sn_cohdc"
",sn_heal"
",sn_tendc"
",sn_tentab"
",sn_cohtab"
",sn_tabpos"
",sn_porp"
",sn_esigma"
;
}
// Enumerator for the energies.
enum EnergyKeys {
kwEStrain=1
, kwESlip
, kwEDashpot
};
// Contact model energy names in a comma separated list. The order corresponds with
// the order of the EnergyKeys enumerator above.
virtual QString getEnergies() const {
return "energy-strain"
",energy-slip"
",energy-dashpot";
}
// Returns the value of the energy (base 1 - getEnergy(1) returns the estrain energy).
virtual double getEnergy(uint i) const;
// Returns whether or not each energy is accumulated (base 1 - getEnergyAccumulate(1)
// returns wther or not the estrain energy is accumulated which is false).
virtual bool getEnergyAccumulate(uint i) const;
// Set an energy value (base 1 - setEnergy(1) sets the estrain energy).
virtual void setEnergy(uint i,const double &d); // Base 1
// Activate the energy. This is only called if the energy tracking is enabled.
virtual void activateEnergy() { if (energies_) return; energies_ = NEWC(Energies());}
// Returns whether or not the energy tracking has been enabled for this contact.
virtual bool getEnergyActivated() const {return (energies_ != 0);}
// Enumerator for contact model related FISH callback events.
enum FishCallEvents {
fActivated=0
,fSlipChange
,fBondBreak
};
// Contact model FISH callback event names in a comma separated list. The order corresponds with
// the order of the FishCallEvents enumerator above.
virtual QString getFishCallEvents() const {
return
"contact_activated"
",slip_change"
",bond_break";
}
// Return the specified contact model property.
virtual QVariant getProperty(uint i,const IContact *) const;
// The return value denotes whether or not the property corresponds to the global
// or local coordinate system (TRUE: global system, FALSE: local system). The
// local system is the contact-plane system (nst) defined as follows.
// If a vector V is expressed in the local system as (Vn, Vs, Vt), then V is
// expressed in the global system as {Vn*nc + Vs*sc + Vt*tc} where where nc, sc
// and tc are unit vectors in directions of the nst axes.
// This is used when rendering contact model properties that are vectors.
virtual bool getPropertyGlobal(uint i) const;
// Set the specified contact model property, ensuring that it is of the correct type
// and within the correct range --- if not, then throw an exception.
// The return value denotes whether or not the update has affected the timestep
// computation (by having modified the translational or rotational tangent stiffnesses).
// If true is returned, then the timestep will be recomputed.
virtual bool setProperty(uint i,const QVariant &v,IContact *);
// The return value denotes whether or not the property is read-only
// (TRUE: read-only, FALSE: read-write).
virtual bool getPropertyReadOnly(uint i) const;
// The return value denotes whether or not the property is inheritable
// (TRUE: inheritable, FALSE: not inheritable). Inheritance is provided by
// the endPropertyUpdated method.
virtual bool supportsInheritance(uint i) const;
// Return whether or not inheritance is enabled for the specified property.
virtual bool getInheritance(uint i) const { assert(i<32); quint32 mask = to<quint32>(1 << i); return (inheritanceField_ & mask) ? true : false; }
// Set the inheritance flag for the specified property.
virtual void setInheritance(uint i,bool b) { assert(i<32); quint32 mask = to<quint32>(1 << i); if (b) inheritanceField_ |= mask; else inheritanceField_ &= ~mask; }
// Enumerator for contact model methods.
enum MethodKeys { kwAssignStiffness=1, kwStiffness, kwBond, kwUnbond, kwArea, kwResetDisp};
// Contact model methoid names in a comma separated list. The order corresponds with
// the order of the MethodKeys enumerator above.
virtual QString getMethods() const { return "assign-stiffness,compute-stiffness,bond,unbond,area,reset-disp";}
// Return a comma seprated list of the contact model method arguments (base 1).
virtual QString getMethodArguments(uint i) const;
// Set contact model method arguments (base 1).
// The return value denotes whether or not the update has affected the timestep
// computation (by having modified the translational or rotational tangent stiffnesses).
// If true is returned, then the timestep will be recomputed.
virtual bool setMethod(uint i,const QVector<QVariant> &vl,IContact *con=0);
// Prepare for entry into ForceDispLaw. The validate function is called when:
// (1) the contact is created, (2) a property of the contact that returns a true via
// the setProperty method has been modified and (3) when a set of cycles is executed
// via the {cycle N} command.
// Return value indicates contact activity (TRUE: active, FALSE: inactive).
virtual bool validate(ContactModelMechanicalState *state,const double ×tep);
// The endPropertyUpdated method is called whenever a surface property (with a name
// that matches an inheritable contact model property name) of one of the contacting
// pieces is modified. This allows the contact model to update its associated
// properties. The return value denotes whether or not the update has affected
// the time step computation (by having modified the translational or rotational
// tangent stiffnesses). If true is returned, then the time step will be recomputed.
virtual bool endPropertyUpdated(const QString &name,const IContactMechanical *c);
// The forceDisplacementLaw function is called during each cycle. Given the relative
// motion of the two contacting pieces (via
// state->relativeTranslationalIncrement_ (Ddn, Ddss, Ddst)
// state->relativeAngularIncrement_ (Dtt, Dtbs, Dtbt)
// Ddn : relative normal-displacement increment, Ddn > 0 is opening
// Ddss : relative shear-displacement increment (s-axis component)
// Ddst : relative shear-displacement increment (t-axis component)
// Dtt : relative twist-rotation increment
// Dtbs : relative bend-rotation increment (s-axis component)
// Dtbt : relative bend-rotation increment (t-axis component)
// The relative displacement and rotation increments:
// Dd = Ddn*nc + Ddss*sc + Ddst*tc
// Dt = Dtt*nc + Dtbs*sc + Dtbt*tc
// where nc, sc and tc are unit vectors in direc. of the nst axes, respectively.
// [see {Table 1: Contact State Variables} in PFC Model Components:
// Contacts and Contact Models: Contact Resolution]
// ) and the contact properties, this function must update the contact force and
// moment.
// The force_ is acting on piece 2, and is expressed in the local coordinate system
// (defined in getPropertyGlobal) such that the first component positive denotes
// compression. If we define the moment acting on piece 2 by Mc, and Mc is expressed
// in the local coordinate system (defined in getPropertyGlobal), then we must use the getMechanicalContact()->updateResultingTorquesLocal(...) method to
// get the total moment.
// The return value indicates the contact activity status (TRUE: active, FALSE:
// inactive) during the next cycle.
// Additional information:
// * If state->activated() is true, then the contact has just become active (it was
// inactive during the previous time step).
// * Fully elastic behavior is enforced during the SOLVE ELASTIC command by having
// the forceDispLaw handle the case of {state->canFail_ == true}.
virtual bool forceDisplacementLaw(ContactModelMechanicalState *state,const double ×tep);
virtual bool thermalCoupling(ContactModelMechanicalState*, ContactModelThermalState* ts, IContactThermal*, const double&);
// The getEffectiveXStiffness functions return the translational and rotational
// tangent stiffnesses used to compute a stable time step. When a contact is sliding,
// the translational tangent shear stiffness is zero (but this stiffness reduction
// is typically ignored when computing a stable time step). If the contact model
// includes a dashpot, then the translational stiffnesses must be increased (see
// Potyondy (2009)).
// [Potyondy, D. 'Stiffness Matrix at a Contact Between Two Clumps,' Itasca
// Consulting Group, Inc., Minneapolis, MN, Technical Memorandum ICG6863-L,
// December 7, 2009.]
virtual DVect2 getEffectiveTranslationalStiffness() const { return effectiveTranslationalStiffness_; }
virtual DAVect getEffectiveRotationalStiffness() const { return effectiveRotationalStiffness_;}
// Return a new instance of the contact model. This is used in the CMAT
// when a new contact is created.
virtual ContactModelRBSN *clone() const override { return NEWC(ContactModelRBSN()); }
// The getActivityDistance function is called by the contact-resolution logic when
// the CMAT is modified. Return value is the activity distance used by the
// checkActivity function.
virtual double getActivityDistance() const {return rgap_;}
// The isOKToDelete function is called by the contact-resolution logic when...
// Return value indicates whether or not the contact may be deleted.
// If TRUE, then the contact may be deleted when it is inactive.
// If FALSE, then the contact may not be deleted (under any condition).
virtual bool isOKToDelete() const { return !isBonded(); }
// Zero the forces and moments stored in the contact model. This function is called
// when the contact becomes inactive.
virtual void resetForcesAndMoments() {
sn_F_ = DVect(0.0);
fictForce_ = DVect(0.0);
sn_M_ = DAVect(0.0);
dp_F(DVect(0.0));
if (energies_) {
energies_->estrain_ = 0.0;
}
}
virtual void setForce(const DVect &v,IContact *c);
virtual void setArea(const double &d) { userArea_ = d; }
virtual double getArea() const { return userArea_; }
// The checkActivity function is called by the contact-resolution logic when...
// Return value indicates contact activity (TRUE: active, FALSE: inactive).
virtual bool checkActivity(const double &gap) { return gap <= rgap_ || isBonded();}
// Returns the sliding state (FALSE is returned if not implemented).
virtual bool isSliding() const { return sn_S_; }
// Returns the bonding state (FALSE is returned if not implemented).
virtual bool isBonded() const { return sn_state_ >= 3; }
virtual void unbond() { sn_state_ = 0; }
// Both of these methods are called only for contacts with facets where the wall
// resolution scheme is set the full. In such cases one might wish to propagate
// contact state information (e.g., shear force) from one active contact to another.
// See the Faceted Wall section in the documentation.
virtual void propagateStateInformation(IContactModelMechanical* oldCm,const CAxes &oldSystem=CAxes(),const CAxes &newSystem=CAxes());
virtual void setNonForcePropsFrom(IContactModel *oldCM);
/// Return the total force that the contact model holds.
virtual DVect getForce(const IContactMechanical *) const;
/// Return the total moment on 1 that the contact model holds
virtual DAVect getMomentOn1(const IContactMechanical *) const;
/// Return the total moment on 1 that the contact model holds
virtual DAVect getMomentOn2(const IContactMechanical *) const;
// Methods to get and set properties.
double sn_Ten() const { return tenTable_[0].x(); }
void sn_Ten(const double &d) { tenTable_[0].rx() = d; }
double sn_Coh() const { return cohTable_[0].x(); }
void sn_Coh(const double &d) { cohTable_[0].rx() = d; }
void sn_MCF(const double &d) { sn_mcf_=d;}
double sn_cohdc() const {return cohTable_.back().y(); }
double sn_tendc() const {return tenTable_.back().y(); }
bool hasDamping() const {return dpProps_ ? true : false;}
double dp_nratio() const {return (hasDamping() ? (dpProps_->dp_nratio_) : 0.0);}
void dp_nratio(const double &d) { if(!hasDamping()) return; dpProps_->dp_nratio_=d;}
double dp_sratio() const {return hasDamping() ? dpProps_->dp_sratio_: 0.0;}
void dp_sratio(const double &d) { if(!hasDamping()) return; dpProps_->dp_sratio_=d;}
int dp_mode() const {return hasDamping() ? dpProps_->dp_mode_: -1;}
void dp_mode(int i) { if(!hasDamping()) return; dpProps_->dp_mode_=i;}
DVect dp_F() const {return hasDamping() ? dpProps_->dp_F_: DVect(0.0);}
void dp_F(const DVect &f) { if(!hasDamping()) return; dpProps_->dp_F_=f;}
bool hasEnergies() const {return energies_ ? true:false;}
double estrain() const {return hasEnergies() ? energies_->estrain_: 0.0;}
void estrain(const double &d) { if(!hasEnergies()) return; energies_->estrain_=d;}
double eslip() const {return hasEnergies() ? energies_->eslip_: 0.0;}
void eslip(const double &d) { if(!hasEnergies()) return; energies_->eslip_=d;}
double edashpot() const {return hasEnergies() ? energies_->edashpot_: 0.0;}
void edashpot(const double &d) { if(!hasEnergies()) return; energies_->edashpot_=d;}
uint inheritanceField() const {return inheritanceField_;}
void inheritanceField(uint i) {inheritanceField_ = i;}
const DVect2 & effectiveTranslationalStiffness() const {return effectiveTranslationalStiffness_;}
void effectiveTranslationalStiffness(const DVect2 &v ) {effectiveTranslationalStiffness_=v;}
const DAVect & effectiveRotationalStiffness() const {return effectiveRotationalStiffness_;}
void effectiveRotationalStiffness(const DAVect &v ) {effectiveRotationalStiffness_=v;}
private:
// Index - used internally by PFC. Should be set to -1 in the cpp file.
static int index_;
bool FDLawBonded(ContactModelMechanicalState *state, const double ×tep);
bool FDLawUnBonded(ContactModelMechanicalState *state, const double ×tep);
// Structure to compute stiffness
struct StiffData {
DVect2 trans_ = DVect2(0.0);
DAVect ang_ = DAVect(0.0);
double reff_ = 0.0;
};
// Structure to store the energies.
struct Energies {
double estrain_ = 0.0; // elastic energy
double eslip_ = 0.0; // work dissipated by friction
double edashpot_ = 0.0; // work dissipated by dashpots
};
// Structure to store dashpot quantities.
struct dpProps {
double dp_nratio_ = 0.0; // normal viscous critical damping ratio
double dp_sratio_ = 0.0; // shear viscous critical damping ratio
int dp_mode_ = 0; // for viscous mode (0-4) 0 = dashpots, 1 = tensile limit, 2 = shear limit, 3 = limit both
DVect dp_F_ = DVect(0.0); // Force in the dashpots
};
bool updateKn(const IContactMechanical *con);
bool updateKs(const IContactMechanical *con);
bool updateFric(const IContactMechanical *con);
StiffData computeStiffData(ContactModelMechanicalState *state) const;
DVect3 computeGeomData(const IContactMechanical *c) const;
DVect2 SMax(const IContactMechanical *con) const; // Maximum stress (tensile,shear) at bond periphery
double shearStrength(const double &pbArea) const; // Bond shear strength
double strainEnergy(double kn, double ks, double kb, double kt) const;
void updateStiffness(ContactModelMechanicalState *state);
// Contact model inheritance fields.
quint32 inheritanceField_;
// Effective translational stiffness.
DVect2 effectiveTranslationalStiffness_ = DVect2(0.0);
DAVect effectiveRotationalStiffness_ = DAVect(0.0); // (Twisting,Bending,Bending) Rotational stiffness (twisting always 0)
// linear model properties
DVect fictForce_ = DVect(0.0);// Ficticous force to be added
DVect sn_F_ = DVect(0.0); // Force carried in the model
DVect2 sn_sdisp_ = DVect2(0.0); // Accumulated total shear displacement
// The x component holds the current slip
DAVect sn_M_ = DAVect(0.0); // moment (bending + twisting in 3D)
DAVect kRot_ = DAVect(0.0); // Translational degrees of freedom
double kTran_ = 0.0; // Translational degrees of freedom
double kRatio_ = 1.0; // Ratio of normal to shear stiffness
double E_ = 0.0; // Young's modulus
double poisson_ = 0.0; // Poisson ratio
double fric_ = 0.0; // Coulomb friction coefficient
double sn_bmul_ = 1.0; // Bending friction multiplier
double sn_tmul_ = 1.0; // Twisting friction multiplier
double sn_rmul_ = 1.0; // Radius multiplier
double userArea_ = 0.0; // Area as specified by the user
double rgap_ = 0.0; // Reference gap
double sn_fa_ = 0.0; // friction angle (stored as tan(dDegrad*fa))
double sn_mcf_ = 1.0; // moment contribution factor
double sn_dil_ = 0.0; // Dilation (stored as tan(dDegrad*dil))
double sn_dilzero_ = 0.0; // Dilation zero
double transTen_ = 0.0; // Force for transition from tensile to compression
double sn_elong_ = 0.0; // Elongation (or normal displacement since softening)
double sn_ndisp_ = 0.0; // Accumulated normal displacement
double sn_cohres_ = 0.0; // Residual cohesion
double sn_por_ = 0.0; // Pore Pressure
uint sn_mode_ = 0; // specifies absolute (0) or incremental (1) behavior for the the normal force
uint sn_state_ = 0; // bond mode - 0 (NBNF), 1 (NBFT), 2 (NBFS), 3 (B)
int sn_tabPos_ = 0; // Position in the table for query
bool poisOffDiag_ = false; // Add the off diagonal terms
bool sn_S_ = false; // The current slip state
bool sn_BS_ = false; // The bending slip state
bool sn_TS_ = false; // The twisting slip state
bool forceSet_ = false; // About setting the force
bool sn_heal_ = false; // Healing behavior
std::vector<DVect2> tenTable_ = { DVect2(0) };
std::vector<DVect2> cohTable_ = { DVect2(0) };
dpProps * dpProps_ = nullptr; // The viscous properties
Energies * energies_ = nullptr; // The energies
};
} // namespace cmodelsxd
// EoF
|
contactmodelrbsn.cpp
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2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 | // contactmodelrbsn.cpp
#include "contactmodelrbsn.h"
#include "module/interface/icontactmechanical.h"
#include "module/interface/icontact.h"
#include "module/interface/ipiece.h"
#include "module/interface/ibody.h"
#include "module/interface/ifishcalllist.h"
#include "utility/src/tptr.h"
#include "shared/src/mathutil.h"
#include "kernel/interface/iprogram.h"
#include "module/interface/icontactthermal.h"
#include "contactmodel/src/contactmodelthermal.h"
#include "../version.txt"
#include "fish/src/parameter.h"
#ifdef RBSN_LIB
int __stdcall DllMain(void *,unsigned, void *) {
return 1;
}
extern "C" EXPORT_TAG const char *getName() {
#if DIM==3
return "contactmodelmechanical3drbsn";
#else
return "contactmodelmechanical2drbsn";
#endif
}
extern "C" EXPORT_TAG unsigned getMajorVersion() {
return MAJOR_VERSION;
}
extern "C" EXPORT_TAG unsigned getMinorVersion() {
return MINOR_VERSION;
}
extern "C" EXPORT_TAG void *createInstance() {
cmodelsxd::ContactModelRBSN *m = NEWC(cmodelsxd::ContactModelRBSN());
return (void *)m;
}
#endif
namespace cmodelsxd {
static const quint32 KnMask = 0x00000002; // Base 1!
static const quint32 KsMask = 0x00000004;
static const quint32 FricMask = 0x00000008;
using namespace itasca;
int ContactModelRBSN::index_ = -1;
UInt ContactModelRBSN::getMinorVersion() const { return MINOR_VERSION; }
ContactModelRBSN::ContactModelRBSN() : inheritanceField_(KnMask|KsMask|FricMask) {
}
ContactModelRBSN::~ContactModelRBSN() {
// Make sure to clean up after yourself!
if (dpProps_)
delete dpProps_;
if (energies_)
delete energies_;
}
void ContactModelRBSN::archive(ArchiveStream &stream) {
if (stream.getRestoreVersion() > 4) {
// New version
stream & fictForce_;
stream & sn_F_;
stream & sn_sdisp_;
stream & sn_M_;
stream & kRot_;
stream & kTran_;
stream & kRatio_;
stream & E_;
stream & poisson_;
stream & fric_;
stream & sn_bmul_;
stream & sn_tmul_;
stream & sn_rmul_;
stream & userArea_;
stream & rgap_;
stream & sn_fa_;
stream & sn_mcf_;
stream & sn_dil_;
stream & sn_dilzero_;
stream & transTen_;
stream & sn_elong_;
stream & sn_ndisp_;
stream & sn_mode_;
stream & sn_state_;
stream & poisOffDiag_;
stream & sn_S_;
stream & sn_BS_;
stream & sn_TS_;
stream & forceSet_;
stream & sn_heal_;
stream & tenTable_;
stream & cohTable_;
stream & inheritanceField_;
stream & effectiveTranslationalStiffness_;
stream & effectiveRotationalStiffness_;
if (stream.getArchiveState()==ArchiveStream::Save) {
bool b = false;
if (dpProps_) {
b = true;
stream & b;
stream & dpProps_->dp_nratio_;
stream & dpProps_->dp_sratio_;
stream & dpProps_->dp_mode_;
stream & dpProps_->dp_F_;
}
else
stream & b;
b = false;
if (energies_) {
b = true;
stream & b;
stream & energies_->estrain_;
stream & energies_->eslip_;
stream & energies_->edashpot_;
}
else
stream & b;
} else {
bool b(false);
stream & b;
if (b) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
stream & dpProps_->dp_nratio_;
stream & dpProps_->dp_sratio_;
stream & dpProps_->dp_mode_;
stream & dpProps_->dp_F_;
}
stream & b;
if (b) {
if (!energies_)
energies_ = NEWC(Energies());
stream & energies_->estrain_;
stream & energies_->eslip_;
stream & energies_->edashpot_;
}
}
if (stream.getArchiveState() == ArchiveStream::Save || stream.getRestoreVersion() > 5) {
stream & sn_tabPos_;
stream & sn_cohres_;
}
if (stream.getArchiveState() == ArchiveStream::Save || stream.getRestoreVersion() > 6)
stream & sn_por_;
} else {
// Backward compatibility
stream & kTran_;
stream & E_;
stream & kRot_;
stream & fictForce_;
stream & poisson_;
stream & fric_;
stream & sn_mode_;
stream & sn_F_;
stream & sn_M_;
stream & sn_S_;
stream & sn_BS_;
stream & sn_TS_;
stream & sn_rmul_;
bool b(false);
stream & b;
if (b) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
stream & dpProps_->dp_nratio_;
stream & dpProps_->dp_sratio_;
stream & dpProps_->dp_mode_;
stream & dpProps_->dp_F_;
}
stream & b;
if (b) {
if (!energies_)
energies_ = NEWC(Energies());
stream & energies_->estrain_;
stream & energies_->eslip_;
stream & energies_->edashpot_;
}
stream & b;
if (b) {
int vi = 0;
stream & vi;
sn_state_ = abs(vi);
double val = 0.0;
stream & val;
tenTable_[0].rx() = val;
val = 0.0;
stream & val;
cohTable_[0].rx() = val;
stream & sn_fa_;
stream & sn_mcf_;
stream & val;
stream & val;
stream & val;
stream & val;
Quat q;
stream & q;
stream & val;
stream & val;
}
stream & inheritanceField_;
stream & effectiveTranslationalStiffness_;
stream & effectiveRotationalStiffness_;
stream & sn_bmul_;
stream & sn_tmul_;
stream & userArea_;
stream & rgap_;
if (stream.getRestoreVersion() > 1)
stream & kRatio_;
if (stream.getRestoreVersion() > 2) {
uint v;
stream & v;
poisOffDiag_ = v == 0 ? false : true;
}
if (stream.getArchiveState() == ArchiveStream::Save || stream.getRestoreVersion() > 3)
stream & forceSet_;
}
}
void ContactModelRBSN::copy(const ContactModel *cm) {
// Copy all of the contact model properties. Used in the CMAT
// when a new contact is created.
ContactModelMechanical::copy(cm);
const ContactModelRBSN *in = dynamic_cast<const ContactModelRBSN*>(cm);
if (!in) throw std::runtime_error("Internal error: contact model dynamic cast failed.");
fictForce_ = in->fictForce_;
sn_F_ = in->sn_F_;
sn_sdisp_ = in->sn_sdisp_;
sn_M_ = in->sn_M_;
kRot_ = in->kRot_;
kTran_ = in->kTran_;
kRatio_ = in->kRatio_;
E_ = in->E_;
poisson_ = in->poisson_;
fric_ = in->fric_;
sn_bmul_ = in->sn_bmul_;
sn_tmul_ = in->sn_tmul_;
sn_rmul_ = in->sn_rmul_;
userArea_ = in->userArea_;
rgap_ = in->rgap_;
sn_fa_ = in->sn_fa_;
sn_mcf_ = in->sn_mcf_;
sn_dil_ = in->sn_dil_;
sn_dilzero_ = in->sn_dilzero_;
transTen_ = in->transTen_;
sn_elong_ = in->sn_elong_;
sn_ndisp_ = in->sn_ndisp_;
sn_mode_ = in->sn_mode_;
sn_state_ = in->sn_state_;
poisOffDiag_ = in->poisOffDiag_;
sn_S_ = in->sn_S_;
sn_BS_ = in->sn_BS_;
sn_TS_ = in->sn_TS_;
forceSet_ = in->forceSet_;
sn_heal_ = in->sn_heal_;
tenTable_ = in->tenTable_;
cohTable_ = in->cohTable_;
sn_por_ = in->sn_por_;
if (in->hasDamping()) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dp_nratio(in->dp_nratio());
dp_sratio(in->dp_sratio());
dp_mode(in->dp_mode());
dp_F(in->dp_F());
}
if (in->hasEnergies()) {
if (!energies_)
energies_ = NEWC(Energies());
estrain(in->estrain());
eslip(in->eslip());
edashpot(in->edashpot());
}
inheritanceField(in->inheritanceField());
effectiveTranslationalStiffness(in->effectiveTranslationalStiffness());
effectiveRotationalStiffness(in->effectiveRotationalStiffness());
}
QVariant ContactModelRBSN::getProperty(uint i,const IContact *con) const {
// Return the property. The IContact pointer is provided so that
// more complicated properties, depending on contact characteristics,
// can be calcualted.
QVariant var;
switch (i) {
case kwKn: return kTran_;
case kwKs: return kTran_ / kRatio_;
case kwKrot: var.setValue(kRot_); return var;
case kwFric: return fric_;
case kwBMul: return sn_bmul_;
case kwTMul: return sn_tmul_;
case kwSNMode: return sn_mode_;
case kwSNF: var.setValue(sn_F_); return var;
case kwSNM: var.setValue(sn_M_); return var;
case kwSNS: return sn_S_;
case kwSNBS: return sn_BS_;
case kwSNTS: return sn_TS_;
case kwPoisDiag: return poisOffDiag_ == false ? 0 : 1;
case kwSNRMul: return sn_rmul_;
case kwSNRadius: {
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (!c) return 0.0;
double Cmax1 = c->getEnd1Curvature().y();
double Cmax2 = c->getEnd2Curvature().y();
if (!userArea_)
return sn_rmul_ * 1.0 / std::max(Cmax1, Cmax2);
else {
#ifdef THREED
double rad = std::sqrt(userArea_ / dPi);
#else
double rad = userArea_ / 2.0;
#endif
return rad;
}
}
case kwEmod: return E_;
case kwKRatio: return 1.0;
case kwDpNRatio: return dpProps_ ? dpProps_->dp_nratio_ : 0;
case kwDpSRatio: return dpProps_ ? dpProps_->dp_sratio_ : 0;
case kwDpMode: return dpProps_ ? dpProps_->dp_mode_ : 0;
case kwDpF: {
dpProps_ ? var.setValue(dpProps_->dp_F_) : var.setValue(DVect(0.0));
return var;
}
case kwSNState: return sn_state_;
case kwSNTStr: return sn_Ten();
case kwSNSStr: {
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (!c) return 0.0;
double area = computeGeomData(c).x();
return shearStrength(area);
}
case kwSNCoh: return cohTable_[0].x();
case kwSNFa: return std::atan(sn_fa_)/dDegrad;
case kwSNMCF: return sn_mcf_;
case kwSNSig: {
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (!c) return 0.0;
return SMax(c).x();
}
case kwSNTau: {
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (!c) return 0.0;
return SMax(c).y();
}
case kwSNArea: {
if (userArea_) return userArea_;
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (!c)
return 0.0;
return computeGeomData(c).x();
}
case kwUserArea:
return userArea_;
case kwRGap:
return rgap_;
case kwPForce: var.setValue(fictForce_); return var;
case kwPois: return poisson_;
case kwSnCohRes : return sn_cohres_;
//case kwSnTenRes : return sn_tenres();
case kwSnDil : return std::atan(sn_dil_)/dDegrad;
case kwSnDilZ : return sn_dilzero_;
case kwSnNormDisp: return sn_ndisp_;
case kwSnShearDisp: var.setValue(sn_sdisp_); return var;
case kwSnCohDc : return sn_cohdc();
case kwSnTenDc : return sn_tendc();
case kwSnHeal : return sn_heal_;
case kwTenTable:
if (sn_tabPos_ < tenTable_.size())
if (sn_tabPos_ == 0)
var.setValue(DVect2(1,0));
else
var.setValue(tenTable_[sn_tabPos_]);
else
var.setValue(DVect2(0,0));
return var;
case kwCohTable:
if (sn_tabPos_ < cohTable_.size())
if (sn_tabPos_ == 0)
var.setValue(DVect2(1,0));
else
var.setValue(cohTable_[sn_tabPos_]);
else
var.setValue(DVect2(0,0));
return var;
case kwTablePos: return sn_tabPos_+1;
case kwPorP: return sn_por_;
case kwStressNorm: {
const IContactMechanical* c(convert_getcast<IContactMechanical>(con));
if (!c)
return 0.0;
return SMax(c).x() + sn_por_;
}
}
assert(0);
return QVariant();
}
bool ContactModelRBSN::getPropertyGlobal(uint i) const {
// Returns whether or not a property is held in the global axis system (TRUE)
// or the local system (FALSE). Used by the plotting logic.
switch (i) {
case kwSNF:
case kwSNM:
case kwDpF:
return false;
}
return true;
}
bool ContactModelRBSN::setProperty(uint i,const QVariant &v,IContact *) {
// Set a contact model property. Return value indicates that the timestep
// should be recalculated.
dpProps dp;
switch (i) {
case kwKn: {
if (!v.canConvert<double>())
throw Exception("kn must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative kn not allowed.");
kTran_ = val;
return true;
}
case kwKs: {
if (!v.canConvert<double>())
throw Exception("ks must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative ks not allowed.");
if (!kTran_)
kTran_ = val;
else
kRatio_ = kTran_ / val;
return true;
}
case kwKrot: {
DAVect val(0.0);
#ifdef TWOD
if (!v.canConvert<DAVect>() && !v.canConvert<double>())
throw Exception("krot must be an angular vector.");
if (v.canConvert<DAVect>())
val = DAVect(v.value<DAVect>());
else
val = DAVect(v.toDouble());
#else
if (!v.canConvert<DAVect>() && !v.canConvert<DVect>())
throw Exception("krot must be an angular vector.");
if (v.canConvert<DAVect>())
val = DAVect(v.value<DAVect>());
else
val = DAVect(v.value<DVect>());
#endif
kRot_ = val;
return false;
}
case kwFric: {
if (!v.canConvert<double>())
throw Exception("fric must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative fric not allowed.");
fric_ = val;
//if (!sn_fa_)
// sn_fa_ = fric_;
return false;
}
case kwBMul: {
if (!v.canConvert<double>())
throw Exception("sn_bmul must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative sn_bmul not allowed.");
sn_bmul_ = val;
return false;
}
case kwTMul: {
if (!v.canConvert<double>())
throw Exception("sn_tmul must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative st_bmul not allowed.");
sn_tmul_ = val;
return false;
}
case kwSNMode: {
if (!v.canConvert<uint>())
throw Exception("sn_mode must be 0 (absolute) or 1 (incremental).");
double val(v.toUInt());
if (val>1)
throw Exception("sn_mode must be 0 (absolute) or 1 (incremental).");
sn_mode_ = val;
return false;
}
case kwSNRMul: {
if (!v.canConvert<double>())
throw Exception("rmul must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative rmul not allowed.");
sn_rmul_ = val;
return false;
}
case kwSNF: {
if (!v.canConvert<DVect>())
throw Exception("sn_force must be a vector.");
DVect val(v.value<DVect>());
sn_F_ = val;
return false;
}
case kwSNM: {
DAVect val(0.0);
#ifdef TWOD
if (!v.canConvert<DAVect>() && !v.canConvert<double>())
throw Exception("res_moment must be an angular vector.");
if (v.canConvert<DAVect>())
val = DAVect(v.value<DAVect>());
else
val = DAVect(v.toDouble());
#else
if (!v.canConvert<DAVect>() && !v.canConvert<DVect>())
throw Exception("res_moment must be an angular vector.");
if (v.canConvert<DAVect>())
val = DAVect(v.value<DAVect>());
else
val = DAVect(v.value<DVect>());
#endif
sn_M_ = val;
return false;
}
case kwDpNRatio: {
if (!v.canConvert<double>())
throw Exception("dp_nratio must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative dp_nratio not allowed.");
if (val == 0.0 && !dpProps_)
return false;
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_nratio_ = val;
return true;
}
case kwDpSRatio: {
if (!v.canConvert<double>())
throw Exception("dp_sratio must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative dp_sratio not allowed.");
if (val == 0.0 && !dpProps_)
return false;
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_sratio_ = val;
return true;
}
case kwDpMode: {
if (!v.canConvert<int>())
throw Exception("The viscous mode dp_mode must be 0, 1, 2, or 3.");
int val(v.toInt());
if (val == 0 && !dpProps_)
return false;
if (val < 0 || val > 3)
throw Exception("The viscous mode dp_mode must be 0, 1, 2, or 3.");
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_mode_ = val;
return false;
}
case kwDpF: {
if (!v.canConvert<DVect>())
throw Exception("dp_force must be a vector.");
DVect val(v.value<DVect>());
if (val.fsum() == 0.0 && !dpProps_)
return false;
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_F_ = val;
return false;
}
case kwSNTStr: {
if (!v.canConvert<double>())
throw Exception("sn_ten must be a double.");
double val(v.toDouble());
if (val < 0.0)
throw Exception("Negative sn_ten not allowed.");
tenTable_[0].rx() = val;
return false;
}
case kwSNCoh: {
if (!v.canConvert<double>())
throw Exception("sn_coh must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative pb_coh not allowed.");
cohTable_[0].rx() = val;
return false;
}
case kwSNFa: {
if (!v.canConvert<double>())
throw Exception("sn_fa must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative sn_fa not allowed.");
if (val >= 90.0)
throw Exception("sn_fa must be lower than 90.0 degrees.");
sn_fa_ = std::tan(val*dDegrad);
if (!fric_)
fric_ = sn_fa_;
return false;
}
case kwSNMCF: {
if (!v.canConvert<double>())
throw Exception("sn_mcf must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative sn_mcf not allowed.");
if (val > 1.0)
throw Exception("sn_mcf must be lower or equal to 1.0.");
sn_mcf_ = val;
return false;
}
case kwSNArea:
case kwUserArea: {
if (!v.canConvert<double>())
throw Exception("area must be a double.");
double val(v.toDouble());
if (val < 0.0)
throw Exception("Negative area not allowed.");
if (userArea_ && val) {
double rat = userArea_ / val;
kTran_ *= rat;
kRot_ *= rat;
}
userArea_ = val;
return true;
}
case kwRGap: {
if (!v.canConvert<double>())
throw Exception("Reference gap must be a double.");
double val(v.toDouble());
rgap_ = val;
return false;
}
case kwPois: {
if (!v.canConvert<double>())
throw Exception("Reference poisson must be a double.");
double val(v.toDouble());
poisson_ = val;
return false;
}
case kwPoisDiag: {
if (!v.canConvert<uint>())
throw Exception("Reference diagonal must be an integer.");
uint b(v.toUInt());
if (b > 1)
throw Exception("diagonal must be 0 (diagonal terms only) or 1 (all terms).");
poisOffDiag_ = b == 0 ? false : true;
return false;
}
case kwSnCohRes: {
bool ok;
double val(v.toDouble(&ok));
if (!ok || val<0.0)
throw Exception("sn_cohres must be a positive double.");
sn_cohres_ = val;
return false;
}
case kwSnDil: {
bool ok;
double val(v.toDouble(&ok));
if (!ok || val<0.0)
throw Exception("sn_dil must be a positive double.");
sn_dil_ = std::tan(val*dDegrad);
return false;
}
case kwSnDilZ: {
bool ok;
double val(v.toDouble(&ok));
if (!ok || val<0.0)
throw Exception("sn_dil_zero must be a positive double.");
sn_dilzero_ = val;
return false;
}
case kwSnNormDisp: {
bool ok;
double val(v.toDouble(&ok));
if (!ok)
throw Exception("sn_ndisp must be a positive double.");
sn_ndisp_ = val;
return false;
}
case kwSnShearDisp: {
if (!v.canConvert<DVect2>())
throw Exception("sn_sdisp must be a vector.");
DVect2 val(v.value<DVect2>());
sn_sdisp_ = val;
return false;
}
case kwSnCohDc: {
bool ok;
double val(v.toDouble(&ok));
if (!ok || val<0.0)
throw Exception("sn_cohdc must be a positive double.");
if (cohTable_.size() == 1)
cohTable_.push_back(DVect2(0,val));
else {
cohTable_.back().ry() = val;
std::sort(cohTable_.begin(),cohTable_.end(), [](const DVect2& a, const DVect2& b) { return a.y() < b.y(); } );
while (cohTable_.back().y() > val)
cohTable_.pop_back();
}
if (sn_state_ == 0)
sn_state_ = 6;
return false;
}
case kwSnTenDc: {
bool ok;
double val(v.toDouble(&ok));
if (!ok || val<0.0)
throw Exception("sn_tendc must be a positive double.");
if (tenTable_.size() == 1)
tenTable_.push_back(DVect2(0,val));
else {
tenTable_.back().ry() = val;
std::sort(tenTable_.begin(),tenTable_.end(), [](const DVect2& a, const DVect2& b) { return a.y() < b.y(); } );
while (tenTable_.back().y() > val)
tenTable_.pop_back();
}
return false;
}
case kwSnHeal: {
bool ok;
int val(v.toInt(&ok));
if (!ok || (val != 0 && val != 1))
throw Exception("sn_heal must be 0 or 1.");
sn_heal_ = val == 0 ? false : true;
return false;
}
case kwTenTable: {
if (!v.canConvert<DVect2>())
throw Exception("sn_tentab entry must be a strength and distance.");
DVect2 vl(v.value<DVect2>());
if (vl.x() < 0 || vl.y() < 0)
throw Exception("The sn_tentab entries must be positive.");
if (vl.y() == 0)
throw Exception("Use sn_ten to set the tensile strength at 0 elongation.");
tenTable_.push_back(vl);
std::sort(tenTable_.begin(),tenTable_.end(), [](const DVect2& a, const DVect2& b) { return a.y() < b.y(); } );
}
return false;
case kwCohTable: {
if (!v.canConvert<DVect2>())
throw Exception("sn_cohtab entry must be a strength and distance.");
DVect2 vl(v.value<DVect2>());
if (vl.x() < 0 || vl.y() < 0)
throw Exception("The sn_cohtab entries must be positive.");
if (vl.y() == 0)
throw Exception("Use sn_coh to set the cohesive strength at 0 elongation.");
cohTable_.push_back(vl);
std::sort(cohTable_.begin(),cohTable_.end(), [](const DVect2& a, const DVect2& b) { return a.y() < b.y(); } );
}
return false;
case kwTablePos: {
bool ok;
int val(v.toInt(&ok));
if (!ok || val < 1)
throw Exception("sn_tabpos must be 1 or greater.");
sn_tabPos_ = val - 1;
return false;
}
case kwPorP: {
if (!v.canConvert<double>())
throw Exception("sn_porp must be a double.");
double val = v.toDouble();
sn_por_ = val;
return true;
}
}
return false;
}
bool ContactModelRBSN::getPropertyReadOnly(uint i) const {
// Returns TRUE if a property is read only or FALSE otherwise.
switch (i) {
case kwDpF:
case kwSNS:
case kwSNBS:
case kwSNTS:
case kwEmod:
case kwKRatio:
case kwSNState:
case kwSNRadius:
case kwSNSStr:
case kwSNSig:
case kwSNTau:
case kwPForce:
case kwStressNorm:
return true;
default:
break;
}
return false;
}
bool ContactModelRBSN::supportsInheritance(uint i) const {
// Returns TRUE if a property supports inheritance or FALSE otherwise.
switch (i) {
case kwKn:
case kwKs:
case kwFric:
return true;
default:
break;
}
return false;
}
QString ContactModelRBSN::getMethodArguments(uint i) const {
// Return a list of contact model method argument names.
switch (i) {
case kwAssignStiffness:
return "kn,kratio";
case kwStiffness:
return "emod,poisson";
case kwBond:
return "gap";
case kwUnbond:
return "gap";
case kwArea:
case kwResetDisp:
return QString();
}
assert(0);
return QString();
}
bool ContactModelRBSN::setMethod(uint i,const QVector<QVariant> &vl,IContact *con) {
// Apply the specified method.
IContactMechanical *c(convert_getcast<IContactMechanical>(con));
switch (i) {
case kwAssignStiffness: {
poisson_ = 0.0;
if (vl.at(0).isNull())
throw Exception("Argument kn must be specified with method assign-stiffness in contact model %1.",getName());
double knpa = vl.at(0).toDouble();
if (knpa<=0.0)
throw Exception("Negative or zero kn not allowed in contact model %1.",getName());
if (vl.at(1).isNull())
throw Exception("Argument kratio must be specified with method assign-stiffness in contact model %1.",getName());
kRatio_ = vl.at(1).toDouble();
if (kRatio_<0.0) {
kRatio_ = 0.0;
throw Exception("Negative kratio not allowed in contact model %1.",getName());
}
const IContactMechanical *mc = convert_getcast<IContactMechanical>(con);
assert(mc);
std::vector<DVect> pts;
mc->getJointGeometry(&pts);
double area = 0.0;
#ifdef THREED
// Step 1: get centroid and area
for (int i=1; i<pts.size()-1; ++i) {
double a = (pts[0] - pts[i]).mag();
double b = (pts[0] - pts[i+1]).mag();
double c = (pts[i] - pts[i+1]).mag();
double la = 0.0;
if (b > a)
std::swap(a,b);
if (c > a)
std::swap(a,c);
if (c > b)
std::swap(b,c);
if (c - (a - b) >= 0)
la = 0.25 * sqrt((a+(b+c))*(c-(a-b))*(c+(a-b))*(a+(b-c)));
area += la;
}
#else
// Assume unit thickness in the out of plane direction
area = (pts[1] - pts[0]).mag();
#endif
userArea_ = area;
kTran_ = knpa * area;
E_ = kTran_ / area;
kRot_ = DAVect(0.0);
setInheritance(1,false);
setInheritance(2,false);
sn_mode_ = 1.0;
return true;
}
case kwStiffness: {
FP_S;
poisson_ = 0.0;
if (vl.at(0).isNull())
throw Exception("Argument emod must be specified with method compute-stiffness in contact model %1.",getName());
E_ = vl.at(0).toDouble();
if (E_<=0.0)
throw Exception("Negative or zero emod not allowed in contact model %1.",getName());
if (vl.at(1).isNull())
throw Exception("Argument poisson must be specified with method compute-stiffness in contact model %1.",getName());
poisson_ = vl.at(1).toDouble();
if (poisson_ < 0.0) {
poisson_ = 0.0;
throw Exception("Negative poisson not allowed in contact model %1.",getName());
}
const IBody *b1 = con->getEnd1()->getIBody();
const IBody *b2 = con->getEnd2()->getIBody();
//double vol1 = b1->getVolume();
//double vol2 = b2->getVolume();
//if (std::max(vol1,vol2) > 10.*std::min(vol1,vol2))
// poisson_ = 0.0;
DVect pos1 = toDVect(b1->getIThing()->getLocation());
DVect pos2 = toDVect(b2->getIThing()->getLocation()) + con->getOffSet();
double dist = (pos1-pos2).mag();
if (con->withWall())
dist = (pos1 - con->getPosition()).mag();
double tol = std::max(pos1.abs().maxComp(),pos2.abs().maxComp())*limits<double>::epsilon()*1000;
if (dist < tol) {
poisson_ = 0;
userArea_ = 0;
kTran_ = 0;
kRot_.fill(0);
return true;
}
const IContactMechanical *mc = convert_getcast<IContactMechanical>(con);
assert(mc);
std::vector<DVect> pts;
FP_S;
mc->getJointGeometry(&pts);
FP_S;
double area = 0.0;
DAVect inertia(0.0);
#ifdef THREED
// Step 1: get centroid and area
DVect cm(0.0);
for (int i=1; i<pts.size()-1; ++i) {
DVect lcm = (pts[0] + pts[i] + pts[i+1])/3.0;
double a = (pts[0] - pts[i]).mag();
double b = (pts[0] - pts[i+1]).mag();
double c = (pts[i] - pts[i+1]).mag();
double la = 0.0;
if (b > a)
std::swap(a,b);
if (c > a)
std::swap(a,c);
if (c > b)
std::swap(b,c);
if (c - (a - b) >= 0)
la = 0.25 * sqrt((a+(b+c))*(c-(a-b))*(c+(a-b))*(a+(b-c)));
cm += lcm * la;
area += la;
}
FP_S;
if (area == 0.0) {
poisson_ = 0;
userArea_ = 0;
kTran_ = 0;
kRot_.fill(0);
return true;
}
cm /= area;
FP_S;
// Step 2 - center it and put in the local system
for (int i=0; i<pts.size(); ++i) {
pts[i] -= cm;
pts[i] = con->getLocalSystem().toLocal(pts[i]);
}
// Step 3: compute the polar inertia
for (int i=0; i<pts.size(); ++i) {
int j = i < pts.size()-1 ? i+1 : 0;
double xi = pts[i].y();
double xip1 = pts[j].y();
double yi = pts[i].z();
double yip1 = pts[j].z();
double frnt = (xi*yip1-xip1*yi);
inertia.ry() += frnt*(xi*xi+xi*xip1+xip1*xip1);
inertia.rz() += frnt*(yi*yi+yi*yip1+yip1*yip1);
}
inertia.ry() = std::abs(inertia.y() / 12.);
inertia.rz() = std::abs(inertia.z() / 12.);
inertia.rx() = inertia.y() + inertia.z();
#else
// Assume unit thickness in the out of plane direction
area = (pts[1] - pts[0]).mag();
inertia.rz() = area*area*area/12.;
#endif
userArea_ = area;
kTran_ = E_ * area / dist;
kRot_ = inertia *E_ / dist;
setInheritance(1,false);
setInheritance(2,false);
sn_mode_ = 1.0;
return true;
}
case kwBond: {
if (sn_state_ == 3) return false;
double mingap = -1.0 * limits<double>::max();
double maxgap = 0;
if (vl.at(0).canConvert<Double>())
maxgap = vl.at(0).toDouble();
else if (vl.at(0).canConvert<DVect2>()) {
DVect2 value = vl.at(0).value<DVect2>();
mingap = value.minComp();
maxgap = value.maxComp();
}
else if (!vl.at(0).isNull())
throw Exception("gap value %1 not recognized in method bond in contact model %2.", vl.at(1), getName());
double gap = c->getGap();
if (gap >= mingap && gap <= maxgap) {
sn_state_ = 3;
sn_mode_ = 1;
return true;
}
return false;
}
case kwUnbond: {
if (sn_state_ == 0) return false;
double mingap = -1.0 * limits<double>::max();
double maxgap = 0;
if (vl.at(0).canConvert<double>())
maxgap = vl.at(0).toDouble();
else if (vl.at(0).canConvert<DVect2>()) {
DVect2 value = vl.at(0).value<DVect2>();
mingap = value.minComp();
maxgap = value.maxComp();
}
else if (!vl.at(0).isNull())
throw Exception("gap value %1 not recognized in method unbond in contact model %2.", vl.at(0), getName());
double gap = c->getGap();
if (gap >= mingap && gap <= maxgap) {
sn_state_ = 0;
return true;
}
return false;
}
case kwArea: {
if (!userArea_) {
double rsq(1./std::max(c->getEnd1Curvature().y(),c->getEnd2Curvature().y()));
#ifdef THREED
userArea_ = rsq * rsq * dPi;
#else
userArea_ = rsq * 2.0;
#endif
}
return true;
}
case kwResetDisp:
sn_ndisp_ = 0.0;
for (int i=1; i<dim; ++i)
sn_sdisp_.rdof(i) = 0;
break;
}
return false;
}
double ContactModelRBSN::getEnergy(uint i) const {
// Return an energy value.
double ret(0.0);
if (!energies_)
return ret;
switch (i) {
case kwEStrain: return energies_->estrain_;
case kwESlip: return energies_->eslip_;
case kwEDashpot: return energies_->edashpot_;
}
assert(0);
return ret;
}
bool ContactModelRBSN::getEnergyAccumulate(uint i) const {
// Returns TRUE if the corresponding energy is accumulated or FALSE otherwise.
switch (i) {
case kwEStrain: return false;
case kwESlip: return true;
case kwEDashpot: return true;
}
assert(0);
return false;
}
void ContactModelRBSN::setEnergy(uint i,const double &d) {
// Set an energy value.
if (!energies_) return;
switch (i) {
case kwEStrain: energies_->estrain_ = d; return;
case kwESlip: energies_->eslip_ = d; return;
case kwEDashpot: energies_->edashpot_= d; return;
}
assert(0);
return;
}
bool ContactModelRBSN::validate(ContactModelMechanicalState *state,const double &) {
// Validate the / Prepare for entry into ForceDispLaw. The validate function is called when:
// (1) the contact is created, (2) a property of the contact that returns a true via
// the setProperty method has been modified and (3) when a set of cycles is executed
// via the {cycle N} command.
// Return value indicates contact activity (TRUE: active, FALSE: inactive).
assert(state);
const IContactMechanical *c = state->getMechanicalContact();
assert(c);
if (state->trackEnergy_)
activateEnergy();
if (inheritanceField_ & KnMask)
updateKn(c);
if (inheritanceField_ & KsMask)
updateKs(c);
if (inheritanceField_ & FricMask)
updateFric(c);
updateStiffness(state);
return checkActivity(state->gap_);
}
static const QString knstr("kn");
bool ContactModelRBSN::updateKn(const IContactMechanical *con) {
assert(con);
QVariant v1 = con->getEnd1()->getProperty(knstr);
QVariant v2 = con->getEnd2()->getProperty(knstr);
if (!v1.isValid() || !v2.isValid())
return false;
double kn1 = v1.toDouble();
double kn2 = v2.toDouble();
double val = kTran_;
if (kn1 && kn2)
kTran_ = kn1*kn2/(kn1+kn2);
else if (kn1)
kTran_ = kn1;
else if (kn2)
kTran_ = kn2;
return ( (kTran_ != val) );
}
static const QString ksstr("ks");
bool ContactModelRBSN::updateKs(const IContactMechanical *con) {
assert(con);
QVariant v1 = con->getEnd1()->getProperty(ksstr);
QVariant v2 = con->getEnd2()->getProperty(ksstr);
if (!v1.isValid() || !v2.isValid())
return false;
double ks1 = v1.toDouble();
double ks2 = v2.toDouble();
double val = kTran_;
if (ks1 && ks2)
kTran_ = ks1*ks2/(ks1+ks2);
else if (ks1)
kTran_ = ks1;
else if (ks2)
kTran_ = ks2;
return ( (kTran_ != val) );
}
static const QString fricstr("fric");
bool ContactModelRBSN::updateFric(const IContactMechanical *con) {
assert(con);
QVariant v1 = con->getEnd1()->getProperty(fricstr);
QVariant v2 = con->getEnd2()->getProperty(fricstr);
if (!v1.isValid() || !v2.isValid())
return false;
double fric1 = std::max(0.0,v1.toDouble());
double fric2 = std::max(0.0,v2.toDouble());
double val = fric_;
fric_ = std::min(fric1,fric2);
return ( (fric_ != val) );
}
bool ContactModelRBSN::endPropertyUpdated(const QString &name,const IContactMechanical *c) {
// The endPropertyUpdated method is called whenever a surface property (with a name
// that matches an inheritable contact model property name) of one of the contacting
// pieces is modified. This allows the contact model to update its associated
// properties. The return value denotes whether or not the update has affected
// the time step computation (by having modified the translational or rotational
// tangent stiffnesses). If true is returned, then the time step will be recomputed.
assert(c);
QStringList availableProperties = getProperties().simplified().replace(" ","").split(",",QString::SkipEmptyParts);
QRegExp rx(name,Qt::CaseInsensitive);
int idx = availableProperties.indexOf(rx)+1;
bool ret=false;
if (idx<=0)
return ret;
switch(idx) {
case kwKn: { //kn
if (inheritanceField_ & KnMask)
ret = updateKn(c);
break;
}
case kwKs: { //ks
if (inheritanceField_ & KsMask)
ret =updateKs(c);
break;
}
case kwFric: { //fric
if (inheritanceField_ & FricMask)
updateFric(c);
break;
}
}
return ret;
}
ContactModelRBSN::StiffData ContactModelRBSN::computeStiffData(ContactModelMechanicalState *state) const {
// Update contact data
//double Cmin1 = state->end1Curvature_.x();
double Cmax1 = state->end1Curvature_.y();
double Cmax2 = state->end2Curvature_.y();
double br = sn_rmul_ * 1.0 / std::max(Cmax1, Cmax2);
if (userArea_)
#ifdef THREED
br = std::sqrt(userArea_ / dPi);
#else
br = userArea_ / 2.0;
#endif
StiffData ret;
ret.reff_ = br;
ret.trans_ = DVect2(kTran_,kTran_/kRatio_);
ret.ang_ = kRot_;
return ret;
}
void ContactModelRBSN::updateStiffness(ContactModelMechanicalState *state) {
// first compute stiffness data
StiffData stiff = computeStiffData(state);
// Now calculate effective stiffness
DVect2 retT = stiff.trans_;
// correction if viscous damping active
if (dpProps_) {
DVect2 correct(1.0);
if (dpProps_->dp_nratio_)
correct.rx() = sqrt(1.0+dpProps_->dp_nratio_*dpProps_->dp_nratio_) - dpProps_->dp_nratio_;
if (dpProps_->dp_sratio_)
correct.ry() = sqrt(1.0+dpProps_->dp_sratio_*dpProps_->dp_sratio_) - dpProps_->dp_sratio_;
retT /= (correct*correct);
}
effectiveTranslationalStiffness_ = retT;
// Effective rotational stiffness (bending and twisting)
effectiveRotationalStiffness_ = stiff.ang_;
}
bool ContactModelRBSN::forceDisplacementLaw(ContactModelMechanicalState *state,const double ×tep) {
assert(state);
if (state->activated()) {
// The contact was just activated from an inactive state
// Trigger the FISH callback if one is hooked up to the
// contact_activated event.
if (cmEvents_[fActivated] >= 0) {
auto c = state->getContact();
std::vector<fish::Parameter> arg = { fish::Parameter(c->getIThing()) };
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fActivated]);
}
}
updateStiffness(state);
// accumulate shear displacement for dilation
sn_ndisp_ += state->relativeTranslationalIncrement_.x();
DVect shearInc = state->relativeTranslationalIncrement_;
shearInc.rx() = 0;
sn_sdisp_.ry() += shearInc.mag();
if (isBonded()) return FDLawBonded(state, timestep);
else return FDLawUnBonded(state, timestep);
}
bool ContactModelRBSN::thermalCoupling(ContactModelMechanicalState*, ContactModelThermalState* ts, IContactThermal*, const double&) {
// Account for thermal expansion in incremental mode
if (sn_mode_ == 0 || ts->gapInc_ == 0.0) return false;
DVect finc(0.0);
finc.rx() = kTran_ * ts->gapInc_;
sn_F_ -= finc;
return true;
}
bool ContactModelRBSN::FDLawBonded(ContactModelMechanicalState *state, const double ×tep) {
// initialize ... get the geometry information
DVect3 geom = computeGeomData(state->getMechanicalContact());
double area = geom.x();
double bi = geom.y();
double br = geom.z();
double kn = kTran_;
double ks = kn / kRatio_;
double kb = kRot_.z();
#if DIM==3
kb = std::sqrt(kb*kb + kRot_.y()*kRot_.y());
double kt = kRot_.x();
#else
double kt = 0.0;
#endif
DVect totalForce = sn_F_ + fictForce_;
//double nsmax0 = -(totalForce.x() / area) + sn_mcf_* sqrt(sn_M_.y()*sn_M_.y() + sn_M_.z()*sn_M_.z()) * br / bi;
// Relative translational/rotational displacement increments
DVect trans = state->relativeTranslationalIncrement_;
DAVect ang = state->relativeAngularIncrement_;
// Store previous force and moment
DVect sn_F_old = totalForce;
sn_F_old.rx() -= sn_por_ * area;
DAVect sn_M_old = sn_M_;
DVect theStiff(ks);
theStiff.rx() = kn;
sn_F_ -= trans * theStiff;
sn_M_ -= ang * kRot_;
if (poisson_ != 0.0) {
const IContact *con = state->getContact();
const IBody *b1 = con->getEnd1()->getIBody();
const IBody *b2 = con->getEnd2()->getIBody();
#ifdef THREED
std::array<double,6> stress11 = {0,0,0,0,0,0};
std::array<double,6> stress22 = {0,0,0,0,0,0};
#else
std::array<double,3> stress11 = {0,0,0};
std::array<double,3> stress22 = {0,0,0};
#endif
double vol1 = b1->getVolume();
double vol2 = b2->getVolume();
b1->getOldStress(stress11);
b2->getOldStress(stress22);
double ms = 0.0;
for (int i=0; i<stress11.size(); ++i) {
stress11[i] = (stress11[i]*vol1 + stress22[i]*vol2)/(vol1 + vol2);
ms = std::max(ms,abs(stress11[i]));
}
DMatrix<dim,dim> stresst(0.0);
#ifdef THREED
stresst.get(0,0) = -poisson_*stress11[1] - poisson_*stress11[2];
stresst.get(1,1) = -poisson_*stress11[0] - poisson_*stress11[2];
#else
stresst.get(0,0) = -poisson_*stress11[1];
stresst.get(1,1) = -poisson_*stress11[0];
#endif
#ifdef THREED
stresst.get(2,2) = -poisson_*stress11[0] - poisson_*stress11[1];
#endif
if (poisOffDiag_) {
#ifdef THREED
double sxy = stress11[3];
double szx = stress11[4];
double syz = stress11[5];
stresst.get(0,1) = poisson_ * sxy;
stresst.get(1,0) = stresst.get(0,1);
stresst.get(0,2) = poisson_ * szx;
stresst.get(2,0) = stresst.get(0,2);
stresst.get(1,2) = poisson_ * syz;
stresst.get(2,1) = stresst.get(1,2);
#else
double sxy = stress11[2];
stresst.get(0,1) = poisson_ * sxy;
stresst.get(1,0) = stresst.get(0,1);
#endif
}
DVect norm = toVect(con->getNormal());
DVect traction = stresst * norm * userArea_;
DVect shear(0.0);
shear.ry() = 1.0;
shear = con->getLocalSystem().toGlobal(shear);
#ifdef THREED
DVect ns = con->getLocalSystem().toGlobal(DVect(0.,0.,1.));
fictForce_ = DVect(norm|traction,shear|traction,ns|traction);
#else
fictForce_ = DVect(norm|traction,shear|traction);
#endif
if (forceSet_ && ms) {
forceSet_ = false;
sn_F_ -= fictForce_;
}
}
FP_S;
double porForce = sn_por_ * area;
sn_F_.rx() -= porForce;
totalForce = sn_F_ + fictForce_;
if (state->canFail_) {
double dbend = sqrt(sn_M_.y()*sn_M_.y() + sn_M_.z()*sn_M_.z());
double nsmax = -(totalForce.x() / area) + sn_mcf_*dbend * br / bi;
bool failed = false;
if (sn_state_ == 3 || sn_state_ == 5) {
double compVal = sn_state_ == 3 ? tenTable_[0].x() : transTen_;
if (nsmax >= compVal ) {
if (tenTable_.back().y() < limits<double>::epsilon()*100)
failed = true;
else {
if (sn_state_ == 3)
sn_elong_ = 0;
transTen_ = compVal;
sn_state_ = 4;
}
}
}
FP_S;
if (sn_state_ == 4) {
sn_elong_ += trans.x();
sn_elong_ = std::max(0.0,sn_elong_);
int ww = -1;
if (sn_elong_ <= tenTable_.back().y()) {
for (int i=0; i<tenTable_.size(); ++i) {
if (tenTable_[i].y() >= sn_elong_) {
ww = i;
break;
}
}
} else
ww = tenTable_.size() - 1;
if (ww > 0) {
//double factor = std::min(1.0, sn_elong_ / tenTable_[ww].y());
double prevVal = ww == 1 ? 1 : tenTable_[ww-1].x();
double curVal = tenTable_[ww].x();
double prevElong = tenTable_[ww-1].y();
double curElong = tenTable_[ww].y();
double slope = (curVal - prevVal)/(curElong - prevElong);
FP_S;
//y-y0 = m(x-x0)
double nstren = slope * (sn_elong_ - prevElong) + prevVal;
if (nstren <= 0)
failed = true;
else {
nstren *= tenTable_[0].x();
if (nsmax >= nstren || slope > 0) {
double fac = nstren / nsmax;
sn_F_.rx() *= fac;
#if DIM==3
sn_M_.ry() *= fac;
#endif
sn_M_.rz() *= fac;
fictForce_.rx() *= fac;
} else {
sn_state_ = 5;
transTen_ = -(sn_F_old.x() / area) + sn_mcf_* sqrt(sn_M_old.y()*sn_M_old.y() + sn_M_old.z()*sn_M_old.z()) * br / bi;
}
}
}
}
if (sn_state_ == 6 && nsmax >= 0)
failed = true;
FP_S;
if (failed) {
// Failed in tension
double se = strainEnergy(kn, ks, kb, kt); // bond strain energy at the onset of failure
sn_state_ = 1;
sn_F_.fill(0.0);
sn_M_.fill(0.0);
failed = true;
fictForce_ = DVect(0.0);
//sn_F_.rx() = -sn_tenres_ * area;
if (cmEvents_[fBondBreak] >= 0) {
auto c = state->getContact();
std::vector<fish::Parameter> arg = { fish::Parameter(c->getIThing()),
fish::Parameter((qint64)sn_state_),
fish::Parameter(nsmax),
fish::Parameter(se)
};
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fBondBreak]);
}
}
FP_S;
if (!failed) {
/* check for shear failure */
double dtwist = sn_M_.x();
DVect bfs(totalForce);
bfs.rx() = 0.0;
double dbfs = bfs.mag();
double ssmax = dbfs / area + sn_mcf_*std::abs(dtwist) * 0.5* br / bi;
double ss = shearStrength(area);
FP_S;
if (ss < 0)
ss = 0;
if (ss <= ssmax) {
// strength when it breaks for
// Failed in shear
double se = strainEnergy(kn, ks, kb, kt); // bond strain energy at the onset of failure
sn_state_ = 2;
fictForce_ = DVect(0.0);
FP_S;
sn_F_ = totalForce;
if (cmEvents_[fBondBreak] >= 0) {
auto c = state->getContact();
std::vector<fish::Parameter> arg = { fish::Parameter(c->getIThing()),
fish::Parameter((qint64)sn_state_),
fish::Parameter(ss),
fish::Parameter(se)
};
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fBondBreak]);
}
double mm = 0.0;
for (int i=1; i<dim; ++i)
mm += trans[i]*trans[i];
sn_sdisp_.rx() = std::sqrt(mm);
double crit = sn_F_.x() * fric_ + sn_cohres_ * area;
if (sn_cohdc() > std::numeric_limits<double>::epsilon()) {
int ww = -1;
if (sn_sdisp_.x() <= sn_cohdc()) {
for (int i=0; i<cohTable_.size(); ++i) {
if (cohTable_[i].y() >= sn_sdisp_.x()) {
ww = i;
break;
}
}
} else
ww = cohTable_.size() - 1;
if (ww > 0) {
double prevVal = ww == 1 ? 1: cohTable_[ww-1].x() ;//critBreak_ : cohTable_[ww-1].x() + sn_F_.x() * fric_;
double curVal = cohTable_[ww].x();//cohTable_[ww].x() + sn_F_.x() * fric_;
double prevShear = cohTable_[ww-1].y();
double curShear = cohTable_[ww].y();
double slope = (curVal - prevVal)/(curShear - prevShear);
// should go from 0 to 1
double mval = slope * (sn_sdisp_.x() - prevShear) + prevVal;
double fact = std::max(0.,std::min(1.0,1.0 - mval));
assert(fact >= 0 && fact <= 1.0);
double theFric = fric_;
if (sn_fa_)
theFric = sn_fa_ + (fric_ - sn_fa_)*fact;
double theCoh = sn_Coh();
if (theCoh)
theCoh = sn_Coh() + (sn_cohres_ - sn_Coh())*fact;
crit = sn_F_.x() * theFric + theCoh * geom.x();
}
}
// Resolve sliding.
FP_S;
if (crit < 0)
crit = 0;
DVect sforce = sn_F_; sforce.rx() = 0.0;
// The is the magnitude of the shear force.
double sfmag = sforce.mag();
// Sliding occurs when the magnitude of the shear force is greater than the
// critical value.
if (sfmag > crit) {
// Lower the shear force to the critical value for sliding.
double rat = crit / sfmag;
sforce *= rat;
sforce.rx() = sn_F_.x();
sn_F_ = sforce;
sn_S_ = true;
}
if (sn_S_) {
if (sn_dil_ > 0) {
double zdd = sn_dilzero_ != 0 ? sn_dilzero_ : limits<double>::max();
double usm = sn_sdisp_.y();
if (usm < zdd) {
double sInc = 0.0;
for (int i=1; i<dim; ++i)
sInc += trans.dof(i)*trans.dof(i);
sInc = std::sqrt(sInc);
sn_F_.rx() += kTran_ * sn_dil_ * sInc;
}
}
}
// Resolve bending
crit = sn_bmul_*2.1*0.25*br*std::abs(sn_F_.x()); // Jiang 2015
FP_S;
DAVect test = sn_M_;
#if DIM==3
test.rx() = 0.0;
#endif
double tmag = test.mag();
if (tmag > crit) {
// Lower the bending moment to the critical value for sliding.
double rat = crit / tmag;
test *= rat;
sn_BS_ = true;
}
sn_M_.rz() = test.z();
#if DIM==3
sn_M_.ry() = test.y();
// Resolve twisting
crit = sn_tmul_ * 0.65*fric_* br*std::abs(sn_F_.x()) ; // Jiang 2015
tmag = std::abs(sn_M_.x());
if (tmag > crit) {
// Lower the shear force to the critical value for sliding.
double rat = crit / tmag;
tmag = sn_M_.x() * rat;
sn_TS_ = true;
}
sn_M_.rx() = tmag;
FP_S;
#endif
}
}
}
sn_F_old.rx() += porForce;
sn_F_.rx() += porForce;
totalForce = sn_F_ + fictForce_;
FP_S;
// Account for dashpot forces if the dashpot structure has been defined.
if (dpProps_) {
dpProps_->dp_F_.fill(0.0);
double vcn(0.0), vcs(0.0);
// Calculate the damping coefficients.
vcn = dpProps_->dp_nratio_ * 2.0 * sqrt((state->inertialMass_*(kn)));
vcs = dpProps_->dp_sratio_ * 2.0 * sqrt((state->inertialMass_*(ks)));
// First damp the shear components
for (int i = 1; i<dim; ++i)
dpProps_->dp_F_.rdof(i) = trans.dof(i) * (-1.0* vcs) / timestep;
// Damp the normal component
dpProps_->dp_F_.rx() -= trans.x() * vcn / timestep;
// Need to change behavior based on the dp_mode.
if ((dpProps_->dp_mode_ == 1 || dpProps_->dp_mode_ == 3)) {
// Limit in tension if not bonded.
if (sn_state_ < 3 && (dpProps_->dp_F_.x() + totalForce.x() < 0))
dpProps_->dp_F_.rx() = -totalForce.rx();
}
if (sn_S_ && dpProps_->dp_mode_ > 1) {
// Limit in shear if sliding.
double dfn = dpProps_->dp_F_.rx();
dpProps_->dp_F_.fill(0.0);
dpProps_->dp_F_.rx() = dfn;
}
}
FP_S;
//Compute energies if energy tracking has been enabled.
if (state->trackEnergy_) {
assert(energies_);
energies_->estrain_ = 0.0;
if (kn)
// Calculate the strain energy.
energies_->estrain_ = 0.5*totalForce.x()*totalForce.x() / kn;
if (ks) {
DVect s = totalForce;
s.rx() = 0.0;
double smag2 = s.mag2();
// Add the shear component of the strain energy.
energies_->estrain_ += 0.5*smag2 / ks;
if (sn_S_) {
// If sliding calculate the slip energy and accumulate it.
sn_F_old.rx() = 0.0;
DVect avg_F_s = (s + sn_F_old)*0.5;
DVect u_s_el = (s - sn_F_old) / ks;
DVect u_s(0.0);
for (int i = 1; i < dim; ++i)
u_s.rdof(i) = trans.dof(i);
energies_->eslip_ -= std::min(0.0, (avg_F_s | (u_s + u_s_el)));
}
}
// Add the bending/twisting resistance energy contributions.
if (kb) {
DAVect tmp = sn_M_;
#ifdef THREED
tmp.rx() = 0.0;
#endif
energies_->estrain_ += 0.5*tmp.mag2() / kb;
if (sn_BS_) {
// accumulate bending slip energy.
DAVect tmp_old = sn_M_old;
#ifdef THREED
tmp_old.rx() = 0.0;
#endif
DAVect avg_M = (tmp + tmp_old)*0.5;
DAVect t_s_el = (tmp - tmp_old) / kb;
energies_->eslip_ -= std::min(0.0, (avg_M | (ang + t_s_el)));
}
}
#ifdef THREED
if (kt) {
double mt = std::abs(sn_M_.x());
energies_->estrain_ += 0.5*mt*mt / kt;
if (sn_TS_) {
// accumulate twisting slip energy.
DAVect tmp(0.0);
DAVect tmp_old(0.0);
tmp.rx() = sn_M_.x();
tmp_old.rx() = sn_M_old.x();
DAVect avg_M = (tmp + tmp_old)*0.5;
DAVect t_s_el = (tmp - tmp_old) / kt;
energies_->eslip_ -= std::min(0.0, (avg_M | (ang + t_s_el)));
}
}
#endif
if (dpProps_) {
// Calculate damping energy (accumulated) if the dashpots are active.
energies_->edashpot_ -= dpProps_->dp_F_ | trans;
}
}
// This is just a sanity check to ensure, in debug mode, that the force/moment aren't wonky.
assert(sn_F_ == sn_F_);
assert(sn_M_ == sn_M_);
assert(fictForce_ == fictForce_);
FP_S;
return true;
}
bool ContactModelRBSN::FDLawUnBonded(ContactModelMechanicalState *state, const double ×tep) {
DVect3 geom = computeGeomData(state->getMechanicalContact());
double br = geom.z();
// Relative translational/rotational displacement increments
DVect trans = state->relativeTranslationalIncrement_;
DAVect ang = state->relativeAngularIncrement_;
double overlap = rgap_ - state->gap_;
double correction = 1.0;
if (state->activated() && sn_mode_ == 0 && trans.x()) {
correction = -1.0*overlap / trans.x();
if (correction < 0)
correction = 1.0;
}
// Store previous force and moment
DVect sn_F_old = sn_F_;
double porForce = sn_por_ * geom.x();
sn_F_old.rx() -= porForce;
DAVect sn_M_old = sn_M_;
double kb = kRot_.z();
#if DIM==3
double kt = kRot_.x();
//kb = std::sqrt(kb * kb + kRot_.y() * kRot_.y());
#endif
// absolute/incremental normal force calculation
DVect theStiff(kTran_/kRatio_);
theStiff.rx() = kTran_;
if (sn_mode_==0)
sn_F_.rx() = overlap * theStiff.x();
else
sn_F_.rx() -= trans.x() * theStiff.x();
// Normal force can only be positive if unbonded
sn_F_.rx() = std::max(0.0, sn_F_.x()) - porForce;
// Calculate the trial shear force.
DVect sforce(0.0);
// dim holds the dimension (e.g., 2 for 2D and 3 for 3D)
// Loop over the shear components (note: the 0 component is the normal component)
// and calculate the shear force.
for (int i = 1; i<dim; ++i)
sforce.rdof(i) = sn_F_.dof(i) - trans.dof(i) * theStiff.dof(i);
// Calculate the trial moment.
DAVect mom = sn_M_ - ang*kRot_;
// If the SOLVE ELASTIC command is given then the
// canFail state is set to FALSE. Otherwise it is always TRUE.
if (state->canFail_) {
bool changed = false;
// Resolve sliding. This is the normal force multiplied by the coefficient of friction.
bool slip_changed = false;
double crit = sn_F_.x() * fric_ + sn_cohres_ * geom.x();
if (sn_state_ != 0) {
if (!sn_S_) {
if (sn_heal_) {
sn_sdisp_.rx() = 0;
crit = sn_F_.x() * sn_fa_ + cohTable_[0].x() * geom.x();
}
} else {
double mm = 0.0;
for (int i=1; i<dim; ++i)
mm += trans[i]*trans[i];
sn_sdisp_.rx() += std::sqrt(mm);
if (sn_cohdc() > std::numeric_limits<double>::epsilon()) {
int ww = -1;
if (sn_sdisp_.x() <= sn_cohdc()) {
for (int i=0; i<cohTable_.size(); ++i) {
if (cohTable_[i].y() >= sn_sdisp_.x()) {
ww = i;
break;
}
}
} else
ww = cohTable_.size() - 1;
if (ww > 0) {
double prevVal = ww == 1 ? 1: cohTable_[ww-1].x() ;//critBreak_ : cohTable_[ww-1].x() + sn_F_.x() * fric_;
double curVal = cohTable_[ww].x();//cohTable_[ww].x() + sn_F_.x() * fric_;
double prevShear = cohTable_[ww-1].y();
double curShear = cohTable_[ww].y();
double slope = (curVal - prevVal)/(curShear - prevShear);
// should go from 0 to 1
double mval = slope * (sn_sdisp_.x() - prevShear) + prevVal;
double fact = std::max(0.,std::min(1.0,1.0 - mval));
assert(fact >= 0 && fact <= 1.0);
double theFric = fric_;
if (sn_fa_)
theFric = sn_fa_ + (fric_ - sn_fa_)*fact;
double theCoh = sn_Coh();
if (theCoh)
theCoh = sn_Coh() + (sn_cohres_ - sn_Coh())*fact;
crit = sn_F_.x() * theFric + theCoh * geom.x();
}
}
}
}
// Resolve sliding.
if (crit < 0)
crit = 0.0;
// The is the magnitude of the shear force.
double sfmag = sforce.mag();
if (sfmag > crit) {
// Lower the shear force to the critical value for sliding.
double rat = crit / sfmag;
sforce *= rat;
if (!sn_S_) {
slip_changed = true;
changed = true;
}
sn_S_ = true;
} else {
if (sn_S_) {
slip_changed = true;
changed = true;
}
sn_S_ = false;
}
if (sn_S_) {
if (sn_dil_ > 0) {
double zdd = sn_dilzero_ != 0 ? sn_dilzero_ : limits<double>::max();
double usm = sn_sdisp_.y();
if (usm < zdd) {
double sInc = 0.0;
for (int i=1; i<dim; ++i)
sInc += trans.dof(i)*trans.dof(i);
sInc = std::sqrt(sInc);
sn_F_.rx() += kTran_ * sn_dil_ * sInc;
}
}
} else {
if (sn_heal_) {
if (shearStrength(geom.x()))
sn_state_ = 6;
}
}
// Resolve bending
bool bslip_changed = false;
crit = sn_bmul_ * 2.1*0.25*sn_F_.x() * br; // Jiang 2015
DAVect test = mom;
#if DIM==3
test.rx() = 0.0;
#endif
double tmag = test.mag();
if (tmag > crit) {
// Lower the bending moment to the critical value for sliding.
double rat = crit / tmag;
test *= rat;
if (!sn_BS_) {
bslip_changed = true;
changed = true;
}
sn_BS_ = true;
}
else {
if (sn_BS_) {
bslip_changed = true;
changed = true;
}
sn_BS_ = false;
}
mom.rz() = test.z();
#if DIM==3
mom.ry() = test.y();
// Resolve twisting
bool tslip_changed = false;
crit = sn_tmul_ * 0.65*fric_*sn_F_.x() * br; // Jiang 2015
tmag = std::abs(mom.x());
if (tmag > crit) {
// Lower the twisting moment to the critical value for sliding.
double rat = crit / tmag;
mom.rx() *= rat;
if (!sn_TS_) {
tslip_changed = true;
changed = true;
}
sn_TS_ = true;
}
else {
if (sn_TS_) {
tslip_changed = true;
changed = true;
}
sn_TS_ = false;
}
#endif
if (changed && cmEvents_[fSlipChange] >= 0) {
qint64 code = 0;
if (slip_changed) {
code = 1;
if (bslip_changed) {
code = 4;
#if DIM==3
if (tslip_changed)
code = 7;
#endif
}
}
else if (bslip_changed) {
code = 2;
#if DIM==3
if (tslip_changed)
code = 6;
#endif
}
#if DIM==3
else if (tslip_changed) {
code = 3;
if (slip_changed)
code = 5;
}
#endif
auto c = state->getContact();
std::vector<fish::Parameter> arg = { fish::Parameter(c->getIThing()),
fish::Parameter(code),
fish::Parameter(sn_S_),
fish::Parameter(sn_BS_)
#ifdef THREED
,fish::Parameter(sn_TS_)
#endif
};
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fSlipChange]);
}
}
sn_F_.rx() += porForce;
sn_F_old.rx() += porForce;
// Set the shear components of the total force.
for (int i = 1; i<dim; ++i)
sn_F_.rdof(i) = sforce.dof(i);
// Set the moment.
sn_M_ = mom;
// Account for dashpot forces if the dashpot structure has been defined.
if (dpProps_) {
dpProps_->dp_F_.fill(0.0);
double vcn(0.0), vcs(0.0);
// Calculate the damping coefficients.
vcn = dpProps_->dp_nratio_ * 2.0 * sqrt((state->inertialMass_*(kTran_)));
vcs = dpProps_->dp_sratio_ * 2.0 * sqrt((state->inertialMass_*(kTran_/kRatio_)));
// First damp the shear components
for (int i = 1; i<dim; ++i)
dpProps_->dp_F_.rdof(i) = trans.dof(i) * (-1.0* vcs) / timestep;
// Damp the normal component
dpProps_->dp_F_.rx() -= trans.x() * vcn / timestep;
// Need to change behavior based on the dp_mode.
if ((dpProps_->dp_mode_ == 1 || dpProps_->dp_mode_ == 3)) {
// Limit in tension if not bonded.
if (dpProps_->dp_F_.x() + sn_F_.x() < 0)
dpProps_->dp_F_.rx() = -sn_F_.rx();
}
if (sn_S_ && dpProps_->dp_mode_ > 1) {
// Limit in shear if not sliding.
double dfn = dpProps_->dp_F_.rx();
dpProps_->dp_F_.fill(0.0);
dpProps_->dp_F_.rx() = dfn;
}
}
//Compute energies if energy tracking has been enabled.
if (state->trackEnergy_) {
assert(energies_);
energies_->estrain_ = 0.0;
if (kTran_)
// Calculate the strain energy.
energies_->estrain_ = 0.5*sn_F_.x()*sn_F_.x() / kTran_;
if (kTran_) {
DVect s = sn_F_;
s.rx() = 0.0;
double smag2 = s.mag2();
// Add the shear component of the strain energy.
energies_->estrain_ += 0.5*smag2 / (kTran_/kRatio_);
if (sn_S_) {
// If sliding calculate the slip energy and accumulate it.
sn_F_old.rx() = 0.0;
DVect avg_F_s = (s + sn_F_old)*0.5;
DVect u_s_el = (s - sn_F_old) / (kTran_/kRatio_);
DVect u_s(0.0);
for (int i = 1; i < dim; ++i)
u_s.rdof(i) = trans.dof(i);
energies_->eslip_ -= std::min(0.0, (avg_F_s | (u_s + u_s_el)));
}
}
// Add the bending/twisting resistance energy contributions.
if (kb) {
DAVect tmp = sn_M_;
#ifdef THREED
tmp.rx() = 0.0;
#endif
energies_->estrain_ += 0.5*tmp.mag2() / kb;
if (sn_BS_) {
// accumulate bending slip energy.
DAVect tmp_old = sn_M_old;
#ifdef THREED
tmp_old.rx() = 0.0;
#endif
DAVect avg_M = (tmp + tmp_old)*0.5;
DAVect t_s_el = (tmp - tmp_old) / kb;
energies_->eslip_ -= std::min(0.0, (avg_M | (ang + t_s_el)));
}
}
#ifdef THREED
if (kt) {
double mt = std::abs(sn_M_.x());
energies_->estrain_ += 0.5*mt*mt / kt;
if (sn_TS_) {
// accumulate twisting slip energy.
DAVect tmp(0.0);
DAVect tmp_old(0.0);
tmp.rx() = sn_M_.x();
tmp_old.rx() = sn_M_old.x();
DAVect avg_M = (tmp + tmp_old)*0.5;
DAVect t_s_el = (tmp - tmp_old) / kt;
energies_->eslip_ -= std::min(0.0, (avg_M | (ang + t_s_el)));
}
}
#endif
if (dpProps_) {
// Calculate damping energy (accumulated) if the dashpots are active.
energies_->edashpot_ -= dpProps_->dp_F_ | trans;
}
}
// This is just a sanity check to ensure, in debug mode, that the force/moment aren't wonky.
assert(sn_F_ == sn_F_);
assert(fictForce_ == fictForce_);
assert(sn_M_ == sn_M_);
return true;
}
void ContactModelRBSN::setForce(const DVect &v,IContact *c) {
sn_F_ = v;
fictForce_ = DVect(0.0);
forceSet_ = true;
if (v.x() > 0)
rgap_ = c->getGap() + v.x() / kTran_;
}
void ContactModelRBSN::propagateStateInformation(IContactModelMechanical* old,const CAxes &oldSystem,const CAxes &newSystem) {
// Only called for contacts with wall facets when the wall resolution scheme
// is set to full!
// Only do something if the contact model is of the same type
if (old->getContactModel()->getName().compare("springnetwork",Qt::CaseInsensitive) == 0 && !isBonded()) {
ContactModelRBSN *oldCm = (ContactModelRBSN *)old;
#ifdef THREED
// Need to rotate just the shear component from oldSystem to newSystem
// Step 1 - rotate oldSystem so that the normal is the same as the normal of newSystem
DVect axis = oldSystem.e1() & newSystem.e1();
double c, ang, s;
DVect re2;
if (!checktol(axis.abs().maxComp(),0.0,1.0,1000)) {
axis = axis.unit();
c = oldSystem.e1()|newSystem.e1();
if (c > 0)
c = std::min(c,1.0);
else
c = std::max(c,-1.0);
ang = acos(c);
s = sin(ang);
double t = 1. - c;
DMatrix<3,3> rm;
rm.get(0,0) = t*axis.x()*axis.x() + c;
rm.get(0,1) = t*axis.x()*axis.y() - axis.z()*s;
rm.get(0,2) = t*axis.x()*axis.z() + axis.y()*s;
rm.get(1,0) = t*axis.x()*axis.y() + axis.z()*s;
rm.get(1,1) = t*axis.y()*axis.y() + c;
rm.get(1,2) = t*axis.y()*axis.z() - axis.x()*s;
rm.get(2,0) = t*axis.x()*axis.z() - axis.y()*s;
rm.get(2,1) = t*axis.y()*axis.z() + axis.x()*s;
rm.get(2,2) = t*axis.z()*axis.z() + c;
re2 = rm*oldSystem.e2();
}
else
re2 = oldSystem.e2();
// Step 2 - get the angle between the oldSystem rotated shear and newSystem shear
axis = re2 & newSystem.e2();
DVect2 tpf;
DVect2 tpm;
DMatrix<2,2> m;
if (!checktol(axis.abs().maxComp(),0.0,1.0,1000)) {
axis = axis.unit();
c = re2|newSystem.e2();
if (c > 0)
c = std::min(c,1.0);
else
c = std::max(c,-1.0);
ang = acos(c);
if (!checktol(axis.x(),newSystem.e1().x(),1.0,100))
ang *= -1;
s = sin(ang);
m.get(0,0) = c;
m.get(1,0) = s;
m.get(0,1) = -m.get(1,0);
m.get(1,1) = m.get(0,0);
tpf = m*DVect2(oldCm->sn_F_.y(),oldCm->sn_F_.z());
tpm = m*DVect2(oldCm->sn_M_.y(),oldCm->sn_M_.z());
} else {
m.get(0,0) = 1.;
m.get(0,1) = 0.;
m.get(1,0) = 0.;
m.get(1,1) = 1.;
tpf = DVect2(oldCm->sn_F_.y(),oldCm->sn_F_.z());
tpm = DVect2(oldCm->sn_M_.y(),oldCm->sn_M_.z());
}
DVect pforce = DVect(0,tpf.x(),tpf.y());
DVect pm = DVect(0,tpm.x(),tpm.y());
#else
oldSystem;
newSystem;
DVect pforce = DVect(0,oldCm->sn_F_.y());
DVect pm = DVect(0,oldCm->sn_M_.y());
#endif
for (int i=1; i<dim; ++i)
sn_F_.rdof(i) += pforce.dof(i);
if (sn_mode_ && oldCm->sn_mode_)
sn_F_.rx() = oldCm->sn_F_.x();
oldCm->sn_F_ = DVect(0.0);
oldCm->sn_M_ = DAVect(0.0);
if (dpProps_ && oldCm->dpProps_) {
#ifdef THREED
tpf = m*DVect2(oldCm->dpProps_->dp_F_.y(),oldCm->dpProps_->dp_F_.z());
pforce = DVect(oldCm->dpProps_->dp_F_.x(),tpf.x(),tpf.y());
#else
pforce = oldCm->dpProps_->dp_F_;
#endif
dpProps_->dp_F_ += pforce;
oldCm->dpProps_->dp_F_ = DVect(0.0);
}
if(oldCm->getEnergyActivated()) {
activateEnergy();
energies_->estrain_ = oldCm->energies_->estrain_;
energies_->edashpot_ = oldCm->energies_->edashpot_;
energies_->eslip_ = oldCm->energies_->eslip_;
oldCm->energies_->estrain_ = 0.0;
oldCm->energies_->edashpot_ = 0.0;
oldCm->energies_->eslip_ = 0.0;
}
rgap_ = oldCm->rgap_;
}
assert(sn_F_ == sn_F_);
}
void ContactModelRBSN::setNonForcePropsFrom(IContactModel *old) {
// Only called for contacts with wall facets when the wall resolution scheme
// is set to full!
// Only do something if the contact model is of the same type
if (old->getName().compare("springnetwork",Qt::CaseInsensitive) == 0 && !isBonded()) {
ContactModelRBSN *oldCm = (ContactModelRBSN *)old;
fictForce_ = oldCm->fictForce_;
sn_F_ = oldCm->sn_F_;
sn_sdisp_ = oldCm->sn_sdisp_;
sn_M_ = oldCm->sn_M_;
kRot_ = oldCm->kRot_;
kTran_ = oldCm->kTran_;
kRatio_ = oldCm->kRatio_;
E_ = oldCm->E_;
poisson_ = oldCm->poisson_;
fric_ = oldCm->fric_;
sn_bmul_ = oldCm->sn_bmul_;
sn_tmul_ = oldCm->sn_tmul_;
sn_rmul_ = oldCm->sn_rmul_;
userArea_ = oldCm->userArea_;
rgap_ = oldCm->rgap_;
sn_fa_ = oldCm->sn_fa_;
sn_mcf_ = oldCm->sn_mcf_;
sn_dil_ = oldCm->sn_dil_;
sn_dilzero_ = oldCm->sn_dilzero_;
transTen_ = oldCm->transTen_;
sn_elong_ = oldCm->sn_elong_;
sn_ndisp_ = oldCm->sn_ndisp_;
sn_mode_ = oldCm->sn_mode_;
sn_state_ = oldCm->sn_state_;
poisOffDiag_ = oldCm->poisOffDiag_;
sn_S_ = oldCm->sn_S_;
sn_BS_ = oldCm->sn_BS_;
sn_TS_ = oldCm->sn_TS_;
forceSet_ = oldCm->forceSet_;
sn_heal_ = oldCm->sn_heal_;
tenTable_ = oldCm->tenTable_;
cohTable_ = oldCm->cohTable_;
if (oldCm->hasDamping()) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dp_nratio(oldCm->dp_nratio());
dp_sratio(oldCm->dp_sratio());
dp_mode(oldCm->dp_mode());
dp_F(oldCm->dp_F());
}
}
}
DVect ContactModelRBSN::getForce(const IContactMechanical *) const {
DVect ret(sn_F_);
ret += fictForce_;
if (dpProps_)
ret += dpProps_->dp_F_;
return ret;
}
DAVect ContactModelRBSN::getMomentOn1(const IContactMechanical *c) const {
DVect force = getForce(c);
DAVect ret(sn_M_);
c->updateResultingTorqueOn1Local(force,&ret);
return ret;
}
DAVect ContactModelRBSN::getMomentOn2(const IContactMechanical *c) const {
DVect force = getForce(c);
DAVect ret(sn_M_);
c->updateResultingTorqueOn2Local(force,&ret);
return ret;
}
DVect3 ContactModelRBSN::computeGeomData(const IContactMechanical *c) const {
double Cmax1 = c->getEnd1Curvature().y();
double Cmax2 = c->getEnd2Curvature().y();
double br = sn_rmul_ * 1.0 / std::max(Cmax1, Cmax2);
if (userArea_)
#ifdef THREED
br = std::sqrt(userArea_ / dPi);
#else
br = userArea_ / 2.0;
#endif
double br2 = br * br;
#ifdef THREED
double area = dPi * br2;
double bi = 0.25*area*br2;
#else
double area = 2.0*br;
double bi = 2.0*br*br2 / 3.0;
#endif
return DVect3(area, bi, br);
}
DVect2 ContactModelRBSN::SMax(const IContactMechanical *c) const {
DVect3 data = computeGeomData(c);
double area = data.x();
double bi = data.y();
double br = data.z();
/* maximum stresses */
//double nsmax0 = -(totalForce.x() / area) + sn_mcf_* sqrt(sn_M_.y()*sn_M_.y() + sn_M_.z()*sn_M_.z()) * br / bi;
double dbend = sqrt(sn_M_.y()*sn_M_.y() + sn_M_.z()*sn_M_.z());
dbend *= sn_mcf_;
double dtwist = sn_M_.x();
DVect bfs(sn_F_);
bfs.rx() = 0.0;
double dbfs = bfs.mag();
double nsmax = -((sn_F_.x()+fictForce_.x()) / area) + dbend * br / bi;
double ssmax = dbfs / area + std::abs(dtwist) * 0.5* br / bi;
return DVect2(nsmax, ssmax);
}
double ContactModelRBSN::shearStrength(const double &area) const {
double sig = -1.0*(sn_F_.x() + fictForce_.x()) / area;
double nstr = (sn_state_ > 2 && sn_state_ != 6) ? tenTable_[0].x() : 0.0;
return sig <= nstr ? cohTable_[0].x() - sn_fa_*sig
: cohTable_[0].x() - sn_fa_*nstr;
}
double ContactModelRBSN::strainEnergy(double kn,double ks,double kb,double kt) const {
double ret(0.0);
if (kn)
ret = 0.5 * (sn_F_.x()+fictForce_.x()) * (sn_F_.x()+fictForce_.x()) / kn;
if (ks) {
DVect tmp = sn_F_ + fictForce_;
tmp.rx() = 0.0;
double smag2 = tmp.mag2();
ret += 0.5 * smag2 / ks;
}
if (kt)
ret += 0.5 * sn_M_.x() * sn_M_.x() / kt;
if (kb) {
DAVect tmp = sn_M_;
#ifdef THREED
tmp.rx() = 0.0;
double smag2 = tmp.mag2();
#else
double smag2 = tmp.z() * tmp.z();
#endif
ret += 0.5 * smag2 / kb;
}
return ret;
}
} // namespace cmodelsxd
// EoF
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