Soft-Bond Model Implementation
See this page for the documentation of this contact model.
contactmodelsoftbond.h
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// contactmodelsoftbond.h
#include "contactmodel/src/contactmodelmechanical.h"
#ifdef SOFTBOND_LIB
# define SOFTBOND_EXPORT EXPORT_TAG
#elif defined(NO_MODEL_IMPORT)
# define SOFTBOND_EXPORT
#else
# define SOFTBOND_EXPORT IMPORT_TAG
#endif
namespace cmodelsxd {
using namespace itasca;
class ContactModelSoftBond : public ContactModelMechanical {
public:
// Constructor: Set default values for contact model properties.
SOFTBOND_EXPORT ContactModelSoftBond();
// Destructor, called when contact is deleted: free allocated memory, etc.
SOFTBOND_EXPORT virtual ~ContactModelSoftBond();
// Contact model name (used as keyword for commands and FISH).
virtual QString getName() const { return "softbond"; }
// 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
, kwFric
, kwBMul
, kwTMul
, kwSBMode
, kwSBF
, kwSBM
, kwSBS
, kwSBBS
, kwSBTS
, kwSBRMul
, kwSBRadius
, kwEmod
, kwKRatio
, kwDpNRatio
, kwDpSRatio
, kwDpMode
, kwDpF
, kwSBState
, kwSBTStr
, kwSBSStr
, kwSBCoh
, kwSBFa
, kwSBMCF
, kwSBSig
, kwSBTau
, kwSBSoft
, kwSBCut
, kwSBArea
, kwUserArea
, kwRGap
};
// 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"
",fric"
",sb_bmul"
",sb_tmul"
",sb_mode"
",sb_force"
",sb_moment"
",sb_slip"
",sb_slipb"
",sb_slipt"
",sb_rmul"
",sb_radius"
",emod"
",kratio"
",dp_nratio"
",dp_sratio"
",dp_mode"
",dp_force"
",sb_state"
",sb_ten"
",sb_shear"
",sb_coh"
",sb_fa"
",sb_mcf"
",sb_sigma"
",sb_tau"
",sb_soft"
",sb_cut"
",sb_area"
",user_area"
",rgap"
;
}
// 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 { kwDeformability=1, kwBond, kwUnbond, kwArea};
// 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 "deformability,bond,unbond,area";}
// 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);
// Perform thermal coupling
virtual bool thermalCoupling(ContactModelMechanicalState*, ContactModelThermalState*, 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 ContactModelSoftBond *clone() const override { return NEWC(ContactModelSoftBond()); }
// 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() {
sb_F(DVect(0.0));
dp_F(DVect(0.0));
sb_M(DAVect(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 sb_S_; }
// Returns the bonding state (FALSE is returned if not implemented).
virtual bool isBonded() const { return bProps_ ? (bProps_->sb_state_ >= 3) : false; }
virtual void unbond() { if (bProps_) bProps_->sb_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.
const double & kn() const {return kn_;}
void kn(const double &d) {kn_=d;}
const double & ks() const {return ks_;}
void ks(const double &d) {ks_=d;}
const double & fric() const {return fric_;}
void fric(const double &d) {fric_=d;}
const double & sb_bmul() const { return sb_bmul_; }
void sb_bmul(const double &d) { sb_bmul_ = d; }
const double & sb_tmul() const { return sb_tmul_; }
void sb_tmul(const double &d) { sb_tmul_ = d; }
const DVect & sb_F() const {return sb_F_;}
void sb_F(const DVect &f) { sb_F_=f;}
const DAVect & sb_M() const { return sb_M_; }
void sb_M(const DAVect &f) { sb_M_ = f; }
bool sb_S() const {return sb_S_;}
void sb_S(bool b) { sb_S_=b;}
bool sb_BS() const { return sb_BS_; }
void sb_BS(bool b) { sb_BS_ = b; }
bool sb_TS() const { return sb_TS_; }
void sb_TS(bool b) { sb_TS_ = b; }
const double & sb_rmul() const { return sb_rmul_; }
void sb_rmul(const double &d) { sb_rmul_ = d; }
uint sb_mode() const {return sb_mode_;}
void sb_mode(uint i) { sb_mode_=i;}
bool hasBond() const { return bProps_ ? true : false; }
int sb_state() const { return (hasBond() ? bProps_->sb_state_ : 0); }
void sb_state(int i) { if (!hasBond()) return; bProps_->sb_state_ = i; }
double sb_Ten() const { return (hasBond() ? (bProps_->sb_ten_) : 0.0); }
void sb_Ten(const double &d) { if (!hasBond()) return; bProps_->sb_ten_ = d; }
double sb_Coh() const { return (hasBond() ? (bProps_->sb_coh_) : 0.0); }
void sb_Coh(const double &d) { if (!hasBond()) return; bProps_->sb_coh_ = d; }
double sb_FA() const { return (hasBond() ? (bProps_->sb_fa_) : 0.0); }
void sb_FA(const double &d) { if (!hasBond()) return; bProps_->sb_fa_ = d; }
double sb_MCF() const {return (hasBond() ? (bProps_->sb_mcf_) : 0.0);}
void sb_MCF(const double &d) { if(!hasBond()) return; bProps_->sb_mcf_=d;}
double sb_soft() const { return (hasBond() ? (bProps_->sb_soft_) : 0.0); }
void sb_soft(const double &d) { if (!hasBond()) return; bProps_->sb_soft_ = d; }
double sb_cut() const { return (hasBond() ? (bProps_->sb_cut_) : 0.0); }
void sb_cut(const double &d) { if (!hasBond()) return; bProps_->sb_cut_ = d; }
double sb_maxTen() const { return (hasBond() ? (bProps_->sb_maxTen_) : 0.0); }
void sb_maxTen(const double &d) { if (!hasBond()) return; bProps_->sb_maxTen_ = d; }
double sb_delu() const { return (hasBond() ? (bProps_->sb_delu_) : 0.0); }
void sb_delu(const double &d) { if (!hasBond()) return; bProps_->sb_delu_ = d; }
Quat sb_delo() const { return (hasBond() ? (bProps_->sb_delo_) : Quat::identity()); }
void sb_delo(const Quat &d) { if (!hasBond()) return; bProps_->sb_delo_ = d; }
double sb_maxu() const { return (hasBond() ? (bProps_->sb_maxu_) : 0.0); }
void sb_maxu(const double &d) { if (!hasBond()) return; bProps_->sb_maxu_ = d; }
double sb_critu() const { return (hasBond() ? (bProps_->sb_critu_) : 0.0); }
void sb_critu(const double &d) { if (!hasBond()) return; bProps_->sb_critu_ = d; }
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
};
// Structure to store bond-related quantities.
struct bProps {
int sb_state_ = 0; // bond mode - 0 (NBNF), 1 (NBFT), 2 (NBFS), 3 (B), 4 (B-Softening), 5 (B-Compression from Softening)
double sb_ten_ = 0.0; // normal strength
double sb_coh_ = 0.0; // cohesion
double sb_fa_ = 0.0; // friction angle
double sb_mcf_ = 1.0; // moment contribution factor
double sb_soft_ = 0.0; // softening factor
double sb_cut_ = 1.0; // critical bond length
double sb_maxTen_ = 0.0; // tensile strength one needs to reach for softening
double sb_delu_ = 0.0; // incremental elongation in softening
Quat sb_delo_ = Quat::identity(); // incremental orientation in softening
double sb_maxu_ = 0.0; // max elongation for softening
double sb_critu_ = 0.0; // critical elongation for softening
};
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_;
DAVect effectiveRotationalStiffness_; // (Twisting,Bending,Bending) Rotational stiffness (twisting always 0)
// linear model properties
double kn_; // Normal stiffness
double ks_; // Shear stiffness
double fric_; // Coulomb friction coefficient
double sb_bmul_; // Bending friction multiplier
double sb_tmul_; // Twisting friction multiplier
uint sb_mode_; // specifies absolute (0) or incremental (1) behavior for the the normal force
DVect sb_F_; // Force carried in the model
DAVect sb_M_; // moment (bending + twisting in 3D)
bool sb_S_; // The current slip state
bool sb_BS_; // The bending slip state
bool sb_TS_; // The twisting slip state
double sb_rmul_; // Radius multiplier
double userArea_; // Area as specified by the user
double rgap_; // Reference gap
dpProps * dpProps_; // The viscous properties
bProps * bProps_; // The bond properties
Energies * energies_; // The energies
};
} // namespace cmodelsxd
// EoF
|
contactmodelsoftbond.cpp
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1822 1823 1824 1825 1826 | // contactmodelsoftbond.cpp
#include "contactmodelsoftbond.h"
#include "module/interface/icontactmechanical.h"
#include "module/interface/icontact.h"
#include "module/interface/ipiecemechanical.h"
#include "module/interface/ipiece.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 SOFTBOND_LIB
#ifdef _WIN32
int __stdcall DllMain(void *,unsigned, void *) {
return 1;
}
#endif
extern "C" EXPORT_TAG const char *getName() {
#if DIM==3
return "contactmodelmechanical3dsoftbond";
#else
return "contactmodelmechanical2dsoftbond";
#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::ContactModelSoftBond *m = NEWC(cmodelsxd::ContactModelSoftBond());
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 ContactModelSoftBond::index_ = -1;
UInt ContactModelSoftBond::getMinorVersion() const { return MINOR_VERSION; }
ContactModelSoftBond::ContactModelSoftBond() : inheritanceField_(KnMask|KsMask|FricMask)
, effectiveTranslationalStiffness_(DVect2(0.0))
, effectiveRotationalStiffness_(DAVect(0.0))
, kn_(0.0)
, ks_(0.0)
, fric_(0.0)
, sb_bmul_(1.0)
, sb_tmul_(1.0)
, sb_mode_(0)
, sb_F_(DVect(0.0))
, sb_M_(DAVect(0.0))
, sb_S_(false)
, sb_BS_(false)
, sb_TS_(false)
, sb_rmul_(1.0)
, userArea_(0.0)
, rgap_(0.0)
, dpProps_(nullptr)
, bProps_(nullptr)
, energies_(nullptr) {
}
ContactModelSoftBond::~ContactModelSoftBond() {
// Make sure to clean up after yourself!
if (dpProps_)
delete dpProps_;
if (bProps_)
delete bProps_;
if (energies_)
delete energies_;
}
void ContactModelSoftBond::archive(ArchiveStream &stream) {
// The stream allows one to archive the values of the contact model
// so that it can be saved and restored. The minor version can be
// used here to allow for incremental changes to the contact model too.
stream & kn_;
stream & ks_;
stream & fric_;
stream & sb_mode_;
stream & sb_F_;
stream & sb_M_;
stream & sb_S_;
stream & sb_BS_;
stream & sb_TS_;
stream & sb_rmul_;
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;
b = false;
if (bProps_) {
b = true;
stream & b;
stream & bProps_->sb_state_;
stream & bProps_->sb_ten_;
stream & bProps_->sb_coh_;
stream & bProps_->sb_fa_;
stream & bProps_->sb_mcf_;
stream & bProps_->sb_soft_;
stream & bProps_->sb_cut_;
stream & bProps_->sb_maxTen_;
stream & bProps_->sb_delu_;
stream & bProps_->sb_delo_;
stream & bProps_->sb_maxu_;
stream & bProps_->sb_critu_;
}
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_;
}
stream & b;
if (b) {
if (!bProps_)
bProps_ = NEWC(bProps());
stream & bProps_->sb_state_;
stream & bProps_->sb_ten_;
stream & bProps_->sb_coh_;
stream & bProps_->sb_fa_;
stream & bProps_->sb_mcf_;
stream & bProps_->sb_soft_;
stream & bProps_->sb_cut_;
stream & bProps_->sb_maxTen_;
stream & bProps_->sb_delu_;
stream & bProps_->sb_delo_;
stream & bProps_->sb_maxu_;
stream & bProps_->sb_critu_;
}
}
stream & inheritanceField_;
stream & effectiveTranslationalStiffness_;
stream & effectiveRotationalStiffness_;
if (stream.getArchiveState() == ArchiveStream::Save || stream.getRestoreVersion() > 1) {
stream & sb_bmul_;
stream & sb_tmul_;
}
if (stream.getArchiveState() == ArchiveStream::Save || stream.getRestoreVersion() > 2)
stream & userArea_;
if (stream.getArchiveState() == ArchiveStream::Save || stream.getRestoreVersion() > 3)
stream & rgap_;
}
void ContactModelSoftBond::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 ContactModelSoftBond *in = dynamic_cast<const ContactModelSoftBond*>(cm);
if (!in) throw std::runtime_error("Internal error: contact model dynamic cast failed.");
kn(in->kn());
ks(in->ks());
fric(in->fric());
sb_bmul(in->sb_bmul());
sb_tmul(in->sb_tmul());
sb_mode(in->sb_mode());
sb_F(in->sb_F());
sb_S(in->sb_S());
sb_BS(in->sb_BS());
sb_TS(in->sb_TS());
sb_rmul(in->sb_rmul());
sb_M(in->sb_M());
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());
}
if (in->hasBond()) {
if (!bProps_)
bProps_ = NEWC(bProps());
sb_state(in->sb_state());
sb_Ten(in->sb_Ten());
sb_Coh(in->sb_Coh());
sb_FA(in->sb_FA());
sb_MCF(in->sb_MCF());
sb_soft(in->sb_soft());
sb_cut(in->sb_cut());
sb_maxTen(in->sb_maxTen());
sb_delu(in->sb_delu());
sb_delo(in->sb_delo());
sb_maxu(in->sb_maxu());
sb_critu(in->sb_critu());
}
userArea_ = in->userArea_;
rgap_ = in->rgap_;
inheritanceField(in->inheritanceField());
effectiveTranslationalStiffness(in->effectiveTranslationalStiffness());
effectiveRotationalStiffness(in->effectiveRotationalStiffness());
}
QVariant ContactModelSoftBond::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 kn_;
case kwKs: return ks_;
case kwFric: return fric_;
case kwBMul: return sb_bmul_;
case kwTMul: return sb_tmul_;
case kwSBMode: return sb_mode_;
case kwSBF: var.setValue(sb_F_); return var;
case kwSBM: var.setValue(sb_M_); return var;
case kwSBS: return sb_S_;
case kwSBBS: return sb_BS_;
case kwSBTS: return sb_TS_;
case kwSBRMul: return sb_rmul_;
case kwSBRadius: {
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 sb_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: {
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (!c) return 0.0;
double rsum(0.0);
if (c->getEnd1Curvature().y())
rsum += 1.0/c->getEnd1Curvature().y();
if (c->getEnd2Curvature().y())
rsum += 1.0/c->getEnd2Curvature().y();
if (userArea_)
#ifdef THREED
rsum = 2.0 * std::sqrt(userArea_ / dPi);
#else
rsum = userArea_;
#endif
return kn_ * rsum;
}
case kwKRatio: return (ks_ == 0.0) ? 0.0 : (kn_/ks_);
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 kwSBState: return bProps_ ? bProps_->sb_state_ : 0;
case kwSBTStr: return bProps_ ? bProps_->sb_ten_ : 0.0;
case kwSBSStr: {
if (!bProps_) return 0.0;
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
double area = computeGeomData(c).x();
return shearStrength(area);
}
case kwSBCoh: return bProps_ ? bProps_->sb_coh_ : 0;
case kwSBFa: return bProps_ ? bProps_->sb_fa_ : 0;
case kwSBMCF: return bProps_ ? bProps_->sb_mcf_ : 0;
case kwSBSig: {
if (!bProps_ || bProps_->sb_state_ < 3) return 0.0;
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
return SMax(c).x();
}
case kwSBTau: {
if (!bProps_ || bProps_->sb_state_ < 3) return 0.0;
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
return SMax(c).y();
}
case kwSBSoft:
if (!bProps_) return 0.0;
return bProps_->sb_soft_;
case kwSBCut:
if (!bProps_) return 0.0;
return bProps_->sb_cut_;
case kwSBArea: {
if (userArea_) return userArea_;
//if (!bProps_) return 0.0;
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (!c)
return 0.0;
return computeGeomData(c).x();
}
case kwUserArea:
return userArea_;
case kwRGap:
return rgap_;
}
assert(0);
return QVariant();
}
bool ContactModelSoftBond::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 kwSBF:
case kwSBM:
case kwDpF:
return false;
}
return true;
}
bool ContactModelSoftBond::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.");
kn_ = 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.");
ks_ = val;
return true;
}
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;
return false;
}
case kwBMul: {
if (!v.canConvert<double>())
throw Exception("sb_bmul must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative sb_bmul not allowed.");
sb_bmul_ = val;
return false;
}
case kwTMul: {
if (!v.canConvert<double>())
throw Exception("sb_tmul must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative st_bmul not allowed.");
sb_tmul_ = val;
return false;
}
case kwSBMode: {
if (!v.canConvert<uint>())
throw Exception("sb_mode must be 0 (absolute) or 1 (incremental).");
double val(v.toUInt());
if (val>1)
throw Exception("sb_mode must be 0 (absolute) or 1 (incremental).");
sb_mode_ = val;
return false;
}
case kwSBRMul: {
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.");
sb_rmul_ = val;
return false;
}
case kwSBF: {
if (!v.canConvert<DVect>())
throw Exception("sb_force must be a vector.");
DVect val(v.value<DVect>());
sb_F_ = val;
return false;
}
case kwSBM: {
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
sb_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 kwSBTStr: {
if (!v.canConvert<double>())
throw Exception("sb_ten must be a double.");
double val(v.toDouble());
if (val < 0.0)
throw Exception("Negative sb_ten not allowed.");
if (val == 0.0 && !bProps_)
return false;
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_ten_ = val;
return false;
}
case kwSBCoh: {
if (!v.canConvert<double>())
throw Exception("sb_coh must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative pb_coh not allowed.");
if (val == 0.0 && !bProps_)
return false;
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_coh_ = val;
return false;
}
case kwSBFa: {
if (!v.canConvert<double>())
throw Exception("sb_fa must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative sb_fa not allowed.");
if (val >= 90.0)
throw Exception("sb_fa must be lower than 90.0 degrees.");
if (val == 0.0 && !bProps_)
return false;
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_fa_ = val;
return false;
}
case kwSBMCF: {
if (!v.canConvert<double>())
throw Exception("sb_mcf must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative sb_mcf not allowed.");
if (val > 1.0)
throw Exception("sb_mcf must be lower or equal to 1.0.");
if (val == 1.0 && !bProps_)
return false;
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_mcf_ = val;
return false;
}
case kwSBSoft: {
if (!v.canConvert<double>())
throw Exception("sb_soft must be a double.");
double val(v.toDouble());
if (val < 0.0)
throw Exception("Negative pb_soft not allowed.");
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_soft_ = val;
return false;
}
case kwSBCut: {
if (!v.canConvert<double>())
throw Exception("sb_cut must be a double.");
double val(v.toDouble());
if (val < 0.0)
throw Exception("Negative sb_cut not allowed.");
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_cut_ = val;
return false;
}
case kwSBArea:
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.");
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;
}
}
return false;
}
bool ContactModelSoftBond::getPropertyReadOnly(uint i) const {
// Returns TRUE if a property is read only or FALSE otherwise.
switch (i) {
case kwDpF:
case kwSBS:
case kwSBBS:
case kwSBTS:
case kwEmod:
case kwKRatio:
case kwSBState:
case kwSBRadius:
case kwSBSStr:
case kwSBSig:
case kwSBTau:
return true;
default:
break;
}
return false;
}
bool ContactModelSoftBond::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 ContactModelSoftBond::getMethodArguments(uint i) const {
// Return a list of contact model method argument names.
switch (i) {
case kwDeformability:
return "emod,kratio";
case kwBond:
return "gap,soft,cut";
case kwUnbond:
return "gap";
case kwArea:
return QString();
}
assert(0);
return QString();
}
bool ContactModelSoftBond::setMethod(uint i,const QVector<QVariant> &vl,IContact *con) {
// Apply the specified method.
IContactMechanical *c(convert_getcast<IContactMechanical>(con));
switch (i) {
case kwDeformability: {
double emod;
double krat;
if (vl.at(0).isNull())
throw Exception("Argument emod must be specified with method deformability in contact model %1.",getName());
emod = vl.at(0).toDouble();
if (emod<0.0)
throw Exception("Negative emod not allowed in contact model %1.",getName());
if (vl.at(1).isNull())
throw Exception("Argument kratio must be specified with method deformability in contact model %1.",getName());
krat = vl.at(1).toDouble();
if (krat<0.0)
throw Exception("Negative stiffness ratio not allowed in contact model %1.",getName());
double rsum(0.0);
if (c->getEnd1Curvature().y())
rsum += 1.0 / c->getEnd1Curvature().y();
if (c->getEnd2Curvature().y())
rsum += 1.0 / c->getEnd2Curvature().y();
if (userArea_)
#ifdef THREED
rsum = 2.0 * std::sqrt(userArea_ / dPi);
#else
rsum = userArea_;
#endif
kn_ = emod / rsum;
ks_ = (krat == 0.0) ? 0.0 : kn_ / krat;
setInheritance(1,false);
setInheritance(2,false);
return true;
}
case kwBond: {
if (bProps_ && bProps_->sb_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 soft = bProps_ ? bProps_->sb_soft_ : 0.0;
if (!vl.at(1).isNull()) {
soft = vl.at(1).toDouble();
if (soft < 0.0)
throw Exception("Negative soft not allowed in contact model %1.", getName());
}
double cut = bProps_ ? bProps_->sb_cut_ : 1.0;
if (!vl.at(2).isNull()) {
if (vl.at(2).canConvert<Double>())
cut = vl.at(2).toDouble();
if (cut < 0.0)
throw Exception("cut value %1 is negative, or not recognized in method bond in contact model %2.", vl.at(2), getName());
if (cut > 1.0)
throw Exception("cut value %1 must be in range [0,1] in method bond in contact model %2.", vl.at(2), getName());
}
double gap = c->getGap();
if (gap >= mingap && gap <= maxgap) {
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_state_ = 3;
bProps_->sb_soft_ = soft;
// Update the critical distance
if (cut != -1)
bProps_->sb_cut_ = cut;
// seet to incremental normal force calculation
sb_mode_ = 1;
return true;
}
return false;
}
case kwUnbond: {
if (!bProps_ || bProps_->sb_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) {
bProps_->sb_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;
}
}
return false;
}
double ContactModelSoftBond::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 ContactModelSoftBond::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 ContactModelSoftBond::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 ContactModelSoftBond::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 ContactModelSoftBond::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 = kn_;
if (kn1 && kn2)
kn_ = kn1*kn2/(kn1+kn2);
else if (kn1)
kn_ = kn1;
else if (kn2)
kn_ = kn2;
return ( (kn_ != val) );
}
static const QString ksstr("ks");
bool ContactModelSoftBond::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 = ks_;
if (ks1 && ks2)
ks_ = ks1*ks2/(ks1+ks2);
else if (ks1)
ks_ = ks1;
else if (ks2)
ks_ = ks2;
return ( (ks_ != val) );
}
static const QString fricstr("fric");
bool ContactModelSoftBond::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 ContactModelSoftBond::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;
}
ContactModelSoftBond::StiffData ContactModelSoftBond::computeStiffData(ContactModelMechanicalState *state) const {
// Update contact data
double Cmin1 = state->end1Curvature_.x();
double Cmax1 = state->end1Curvature_.y();
double Cmax2 = state->end2Curvature_.y();
double dthick = (Cmin1 == 0.0) ? 1.0 : 0.0;
double br = sb_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;
double area = dthick <= 0.0 ? dPi * br2 : 2.0*br*dthick;
double bi = dthick <= 0.0 ? 0.25*area*br2 : 2.0*br*br2*dthick / 3.0;
StiffData ret;
ret.reff_ = br;
ret.trans_ = DVect2(kn_ * area , ks_ * area);
ret.ang_ = DAVect(kn_ * bi);
#if DIM==3
ret.ang_.rx() = ks_ * 2.0*bi;
#endif
return ret;
}
void ContactModelSoftBond::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 ContactModelSoftBond::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);
if (isBonded()) return FDLawBonded(state, timestep);
else return FDLawUnBonded(state, timestep);
}
bool ContactModelSoftBond::FDLawBonded(ContactModelMechanicalState *state, const double ×tep) {
// Relative translational/rotational displacement increments
DVect trans = state->relativeTranslationalIncrement_;
DAVect ang = state->relativeAngularIncrement_;
// Store previous force and moment
DVect sb_F_old = sb_F_;
DAVect sb_M_old = sb_M_;
// Update stiffness data
StiffData stiff = computeStiffData(state);
DVect3 geom = computeGeomData(state->getMechanicalContact());
double area = geom.x();
double bi = geom.y();
double br = geom.z();
double kn = stiff.trans_.x();
double ks = stiff.trans_.y();
double kb = stiff.ang_.z();
#if DIM==3
double kt = stiff.ang_.x();
#else
double kt = 0.0;
#endif
double nsmax0 = -(sb_F_.x() / area) + bProps_->sb_mcf_* sqrt(sb_M_.y()*sb_M_.y() + sb_M_.z()*sb_M_.z()) * br / bi;
// incremental normal force calculation
sb_F_.rx() -= trans.x() * kn;
// shear force calculation
// 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)
sb_F_.rdof(i) -= trans.dof(i) * ks;
// moment calculation
sb_M_ -= ang * stiff.ang_;
double dbend = sqrt(sb_M_.y()*sb_M_.y() + sb_M_.z()*sb_M_.z());
// maximum tensile stress at bond periphery
double nsmax = -(sb_F_.x() / area) + bProps_->sb_mcf_* dbend * br / bi;
bool softened = false;
// Mode check
if (state->canFail_) {
if (bProps_->sb_state_ == 3 || bProps_->sb_state_ == 5) {
double compVal = bProps_->sb_state_ == 3 ? bProps_->sb_ten_ : bProps_->sb_maxTen_;
if (nsmax >= compVal ) {
// enter softening regime
// current bond elongation when softening starts
// This is the elongation at the bond periphery
double ls = - sb_F_.x() / kn + bProps_->sb_mcf_*dbend* br / kb;
bProps_->sb_maxTen_ = compVal;
if (bProps_->sb_state_ == 3)
bProps_->sb_critu_ = ls /**(1.0+bProps_->sb_soft_)*/;
bProps_->sb_delu_ = 0.0;
bProps_->sb_delo_ = Quat::identity();
if (bProps_->sb_state_ == 5 && nsmax < bProps_->sb_maxTen_)
softened = true;
bProps_->sb_state_ = 4;
}
}
}
if (bProps_->sb_state_ == 4 && !softened && !checktol(bProps_->sb_soft_,0.0,1.0,100.0)) {
double ls = bProps_->sb_critu_;
double lc = ls * (1.0+bProps_->sb_soft_);
DVect normal(0.0);
normal.rx() = 1.0;
DVect backNormal = (bProps_->sb_delo_.getConj().rotate(normal)).unit();
double bend = acos(qBound(-1.0,normal|backNormal,1.0));
double l0 = ls + bProps_->sb_maxu_ + bProps_->sb_delu_ + br*abs(bend);
bProps_->sb_delu_ += trans.x();
bProps_->sb_delo_.increment(ang);
// Take the current contact normal and rotate it in the opposite direction of
// the orientation - get the angle of bend from there
backNormal = (bProps_->sb_delo_.getConj().rotate(normal)).unit();
bend = acos(qBound(-1.0,normal|backNormal,1.0));
double l = ls + bProps_->sb_maxu_ + bProps_->sb_delu_ + br*abs(bend);
// target tensile stress
double ns = bProps_->sb_ten_*(lc-l) / (bProps_->sb_soft_*ls);
if (ns > 0) {
if (nsmax >= ns) {
double fac = ns / nsmax;
sb_F_.rx() = fac*sb_F_.x();
#if DIM==3
sb_M_.ry() = fac*sb_M_.y();
#endif
sb_M_.rz() = fac*sb_M_.z();
} else {
bProps_->sb_state_ = 5;
bProps_->sb_maxTen_ = nsmax0;
bProps_->sb_maxu_ = (l0-ls);
}
} else {
sb_F_.rx() = 0.0;
#if DIM==3
sb_M_.ry() = 0.0;
#endif
sb_M_.rz() = 0.0;
}
}
if (state->canFail_) {
/* check for normal failure */
bool failed = false;
if (bProps_->sb_state_ == 4) {
double dbend = sqrt(sb_M_.y()*sb_M_.y() + sb_M_.z()*sb_M_.z());
double nsmax = -(sb_F_.x() / area) + bProps_->sb_mcf_*dbend * br / bi;
if (nsmax <= bProps_->sb_ten_*bProps_->sb_cut_ || checktol(bProps_->sb_soft_,0.0,1.0,100.0)) {
// Failed in tension
double se = strainEnergy(kn, ks, kb, kt); // bond strain energy at the onset of failure
bProps_->sb_state_ = 1;
sb_F_.fill(0.0);
sb_M_.fill(0.0);
failed = true;
if (cmEvents_[fBondBreak] >= 0) {
auto c = state->getContact();
std::vector<fish::Parameter> arg = { fish::Parameter(c->getIThing()),
fish::Parameter((qint64)bProps_->sb_state_),
fish::Parameter(nsmax),
fish::Parameter(se)
};
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fBondBreak]);
}
}
}
if (!failed) {
/* check for shear failure */
double dtwist = sb_M_.x();
DVect bfs(sb_F_);
bfs.rx() = 0.0;
double dbfs = bfs.mag();
double ssmax = dbfs / area + bProps_->sb_mcf_*std::abs(dtwist) * 0.5* br / bi;
double ss = shearStrength(area);
if (ss < 0)
ss = 0;
if (ss <= ssmax) {
// Failed in shear
double se = strainEnergy(kn, ks, kb, kt); // bond strain energy at the onset of failure
bProps_->sb_state_ = 2;
if (cmEvents_[fBondBreak] >= 0) {
auto c = state->getContact();
std::vector<fish::Parameter> arg = { fish::Parameter(c->getIThing()),
fish::Parameter((qint64)bProps_->sb_state_),
fish::Parameter(ss),
fish::Parameter(se)
};
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fBondBreak]);
}
// Resolve sliding.
double crit = sb_F_.x() * fric_;
if (crit < 0)
crit = 0;
DVect sforce = sb_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() = sb_F_.x();
sb_F_ = sforce;
sb_S_ = true;
}
// Resolve bending
crit = sb_bmul_*2.1*0.25*stiff.reff_*std::abs(sb_F_.x()); // Jiang 2015
DAVect test = sb_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;
sb_BS_ = true;
}
sb_M_.rz() = test.z();
#if DIM==3
sb_M_.ry() = test.y();
// Resolve twisting
crit = sb_tmul_ * 0.65*fric_* stiff.reff_*std::abs(sb_F_.x()) ; // Jiang 2015
tmag = std::abs(sb_M_.x());
if (tmag > crit) {
// Lower the shear force to the critical value for sliding.
double rat = crit / tmag;
tmag = sb_M_.x() * rat;
sb_TS_ = true;
} else
tmag = sb_M_.x();
sb_M_.rx() = tmag;
#endif
}
}
}
// 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 (bProps_->sb_state_ < 3 && (dpProps_->dp_mode_ == 1 || dpProps_->dp_mode_ == 3)) {
// Limit in tension if not bonded.
if (dpProps_->dp_F_.x() + sb_F_.x() < 0)
dpProps_->dp_F_.rx() = -sb_F_.rx();
}
if (sb_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;
}
}
//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*sb_F_.x()*sb_F_.x() / kn;
if (ks) {
DVect s = sb_F_;
s.rx() = 0.0;
double smag2 = s.mag2();
// Add the shear component of the strain energy.
energies_->estrain_ += 0.5*smag2 / ks;
if (sb_S_) {
// If sliding calculate the slip energy and accumulate it.
sb_F_old.rx() = 0.0;
DVect avg_F_s = (s + sb_F_old)*0.5;
DVect u_s_el = (s - sb_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 = sb_M_;
#ifdef THREED
tmp.rx() = 0.0;
#endif
energies_->estrain_ += 0.5*tmp.mag2() / kb;
if (sb_BS_) {
// accumulate bending slip energy.
DAVect tmp_old = sb_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(sb_M_.x());
energies_->estrain_ += 0.5*mt*mt / kt;
if (sb_TS_) {
// accumulate twisting slip energy.
DAVect tmp(0.0);
DAVect tmp_old(0.0);
tmp.rx() = sb_M_.x();
tmp_old.rx() = sb_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(sb_F_ == sb_F_);
assert(sb_M_ == sb_M_);
return true;
}
bool ContactModelSoftBond::FDLawUnBonded(ContactModelMechanicalState *state, const double ×tep) {
// 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() && sb_mode_ == 0 && trans.x()) {
correction = -1.0*overlap / trans.x();
if (correction < 0)
correction = 1.0;
}
// Store previous force and moment
DVect sb_F_old = sb_F_;
DAVect sb_M_old = sb_M_;
// Update stiffness data
StiffData stiff = computeStiffData(state);
double kn = stiff.trans_.x();
double ks = stiff.trans_.y();
double kb = stiff.ang_.z();
#if DIM==3
double kt = stiff.ang_.x();
#endif
// absolute/incremental normal force calculation
if (sb_mode_==0)
sb_F_.rx() = overlap * kn;
else
sb_F_.rx() -= trans.x() * kn;
// Normal force can only be positive if unbonded
sb_F_.rx() = std::max(0.0, sb_F_.x());
// 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) = sb_F_.dof(i) - trans.dof(i) * ks;
// Calculate the trial moment.
DAVect mom = sb_M_ - ang*stiff.ang_;
// 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 = sb_F_.x() * fric_;
// 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;
if (!sb_S_) {
slip_changed = true;
changed = true;
}
sb_S_ = true;
}
else {
if (sb_S_) {
slip_changed = true;
changed = true;
}
sb_S_ = false;
}
// Resolve bending
bool bslip_changed = false;
crit = sb_bmul_ * 2.1*0.25*sb_F_.x() * stiff.reff_; // 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 (!sb_BS_) {
bslip_changed = true;
changed = true;
}
sb_BS_ = true;
}
else {
if (sb_BS_) {
bslip_changed = true;
changed = true;
}
sb_BS_ = false;
}
mom.rz() = test.z();
#if DIM==3
mom.ry() = test.y();
// Resolve twisting
bool tslip_changed = false;
crit = sb_tmul_ * 0.65*fric_*sb_F_.x() * stiff.reff_; // 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 (!sb_TS_) {
tslip_changed = true;
changed = true;
}
sb_TS_ = true;
} else {
if (sb_TS_) {
tslip_changed = true;
changed = true;
}
sb_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(sb_S_),
fish::Parameter(sb_BS_)
#ifdef THREED
,fish::Parameter(sb_TS_)
#endif
};
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fSlipChange]);
}
}
// Set the shear components of the total force.
for (int i = 1; i<dim; ++i)
sb_F_.rdof(i) = sforce.dof(i);
// Set the moment.
sb_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_*(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 (dpProps_->dp_F_.x() + sb_F_.x() < 0)
dpProps_->dp_F_.rx() = -sb_F_.rx();
}
if (sb_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 (kn_)
// Calculate the strain energy.
energies_->estrain_ = 0.5*sb_F_.x()*sb_F_.x() / kn;
if (ks_) {
DVect s = sb_F_;
s.rx() = 0.0;
double smag2 = s.mag2();
// Add the shear component of the strain energy.
energies_->estrain_ += 0.5*smag2 / ks;
if (sb_S_) {
// If sliding calculate the slip energy and accumulate it.
sb_F_old.rx() = 0.0;
DVect avg_F_s = (s + sb_F_old)*0.5;
DVect u_s_el = (s - sb_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 = sb_M_;
#ifdef THREED
tmp.rx() = 0.0;
#endif
energies_->estrain_ += 0.5*tmp.mag2() / kb;
if (sb_BS_) {
// accumulate bending slip energy.
DAVect tmp_old = sb_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(sb_M_.x());
energies_->estrain_ += 0.5*mt*mt / kt;
if (sb_TS_) {
// accumulate twisting slip energy.
DAVect tmp(0.0);
DAVect tmp_old(0.0);
tmp.rx() = sb_M_.x();
tmp_old.rx() = sb_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(sb_F_ == sb_F_);
assert(sb_M_ == sb_M_);
return true;
}
bool ContactModelSoftBond::thermalCoupling(ContactModelMechanicalState*, ContactModelThermalState* ts, IContactThermal*, const double&) {
// Account for thermal expansion in incremental mode
if (sb_mode_ == 0 || ts->gapInc_ == 0.0) return false;
DVect finc(0.0);
finc.rx() = kn_ * ts->gapInc_;
sb_F_ -= finc;
return true;
}
void ContactModelSoftBond::setForce(const DVect &v,IContact *c) {
sb_F(v);
if (v.x() > 0)
rgap_ = c->getGap() + v.x() / (kn_ * computeGeomData(convert_getcast<IContactMechanical>(c)).x());
}
void ContactModelSoftBond::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("softbond",Qt::CaseInsensitive) == 0 && !isBonded()) {
ContactModelSoftBond *oldCm = (ContactModelSoftBond *)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->sb_F_.y(),oldCm->sb_F_.z());
tpm = m*DVect2(oldCm->sb_M_.y(),oldCm->sb_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->sb_F_.y(),oldCm->sb_F_.z());
tpm = DVect2(oldCm->sb_M_.y(),oldCm->sb_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->sb_F_.y());
DVect pm = DVect(0,oldCm->sb_M_.y());
#endif
for (int i=1; i<dim; ++i)
sb_F_.rdof(i) += pforce.dof(i);
if (sb_mode_ && oldCm->sb_mode_)
sb_F_.rx() = oldCm->sb_F_.x();
oldCm->sb_F_ = DVect(0.0);
oldCm->sb_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(sb_F_ == sb_F_);
}
void ContactModelSoftBond::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("softbond",Qt::CaseInsensitive) == 0 && !isBonded()) {
ContactModelSoftBond *oldCm = (ContactModelSoftBond *)old;
kn_ = oldCm->kn_;
ks_ = oldCm->ks_;
fric_ = oldCm->fric_;
sb_bmul_ = oldCm->sb_bmul_;
sb_tmul_ = oldCm->sb_tmul_;
sb_mode_ = oldCm->sb_mode_;
sb_rmul_ = oldCm->sb_rmul_;
sb_S_ = oldCm->sb_S_;
sb_BS_ = oldCm->sb_BS_;
sb_TS_ = oldCm->sb_TS_;
rgap_ = oldCm->rgap_;
userArea_ = oldCm->userArea_;
if (oldCm->dpProps_) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_nratio_ = oldCm->dpProps_->dp_nratio_;
dpProps_->dp_sratio_ = oldCm->dpProps_->dp_sratio_;
dpProps_->dp_mode_ = oldCm->dpProps_->dp_mode_;
}
if (oldCm->bProps_) {
if (!bProps_)
bProps_ = NEWC(bProps());
bProps_->sb_mcf_ = oldCm->bProps_->sb_mcf_;
bProps_->sb_fa_ = oldCm->bProps_->sb_fa_;
bProps_->sb_state_ = oldCm->bProps_->sb_state_;
bProps_->sb_coh_ = oldCm->bProps_->sb_coh_;
bProps_->sb_ten_ = oldCm->bProps_->sb_ten_;
bProps_->sb_maxTen_ = oldCm->bProps_->sb_maxTen_;
bProps_->sb_cut_ = oldCm->bProps_->sb_cut_;
bProps_->sb_delu_ = oldCm->bProps_->sb_delu_;
bProps_->sb_delo_ = oldCm->bProps_->sb_delo_;
bProps_->sb_maxu_ = oldCm->bProps_->sb_maxu_;
bProps_->sb_critu_ = oldCm->bProps_->sb_critu_;
}
}
}
DVect ContactModelSoftBond::getForce(const IContactMechanical *) const {
DVect ret(sb_F_);
if (dpProps_)
ret += dpProps_->dp_F_;
return ret;
}
DAVect ContactModelSoftBond::getMomentOn1(const IContactMechanical *c) const {
DVect force = getForce(c);
DAVect ret(sb_M_);
c->updateResultingTorqueOn1Local(force,&ret);
return ret;
}
DAVect ContactModelSoftBond::getMomentOn2(const IContactMechanical *c) const {
DVect force = getForce(c);
DAVect ret(sb_M_);
c->updateResultingTorqueOn2Local(force,&ret);
return ret;
}
DVect3 ContactModelSoftBond::computeGeomData(const IContactMechanical *c) const {
double Cmax1 = c->getEnd1Curvature().y();
double Cmax2 = c->getEnd2Curvature().y();
double br = sb_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 TWOD
double area = 2.0*br;
double bi = 2.0*br*br2 / 3.0;
#else
double area = dPi * br2;
double bi = 0.25*area*br2;
#endif
return DVect3(area, bi, br);
}
DVect2 ContactModelSoftBond::SMax(const IContactMechanical *c) const {
DVect3 data = computeGeomData(c);
double area = data.x();
double bi = data.y();
double br = data.z();
/* maximum stresses */
double dbend = sqrt(sb_M_.y()*sb_M_.y() + sb_M_.z()*sb_M_.z());
double dtwist = sb_M_.x();
DVect bfs(sb_F_);
bfs.rx() = 0.0;
double dbfs = bfs.mag();
double nsmax = -(sb_F_.x() / area) + dbend * br / bi;
double ssmax = dbfs / area + std::abs(dtwist) * 0.5* br / bi;
return DVect2(nsmax, ssmax);
}
double ContactModelSoftBond::shearStrength(const double &area) const {
if (!bProps_) return 0.0;
double sig = -1.0*sb_F_.x() / area;
double nstr = bProps_->sb_state_ > 2 ? bProps_->sb_ten_ : 0.0;
return sig <= nstr ? bProps_->sb_coh_ - std::tan(dDegrad*bProps_->sb_fa_)*sig
: bProps_->sb_coh_ - std::tan(dDegrad*bProps_->sb_fa_)*nstr;
}
double ContactModelSoftBond::strainEnergy(double kn,double ks,double kb,double kt) const {
double ret(0.0);
if (kn)
ret = 0.5 * sb_F_.x() * sb_F_.x() / kn;
if (ks) {
DVect tmp = sb_F_;
tmp.rx() = 0.0;
double smag2 = tmp.mag2();
ret += 0.5 * smag2 / ks;
}
if (kt)
ret += 0.5 * sb_M_.x() * sb_M_.x() / kt;
if (kb) {
DAVect tmp = sb_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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