Cable

class itasca.structure.Cable

Objects of this type should not be created (instantiated) directly in Python. Use the module functions that return instances of this type.

area() → float.

Get the cross-section area of the cable element.

component_id() → int.

Get the Cable component id.

connectivity(component: int) → bool.

Get the index of the node with component-ID id in the element. A ValueError exception is raised if no node in that element matches.

delete() → None.

Delete this structural element.

density() → float.

Get the density of this structural element.

extra(slot: int) → any.

Get the Cable extra data in the given slot.

force_axial() → float.

Get the average axial force of the element (positive: tension; negative: compression).

force_nodal() → (vec3, vec3, vec3, vec3).

Get the generalized nodal force acting at each end. The translational and rotational components of node 1 are given first.

group([slot: str]) → str.

Get the Cable group name in a given slot.

group_remove(group_name: str) → bool.

Remove from the given group from all group slots of the Cable. One argument of type string, giving the group name, is required. The return value is a bool which is True if the group was removed from any slot, otherwise False.

groups() → {slot: group_name}.

Get a dictionary describing which groups this Cable is part of. The keys of the dictionary are the slot names and the values are the group names.

grout_cohesion() → float.

Get the grout cohesion.

grout_confining() → (float, float).

Get the confining stress acting on the grout at each end. Negative value indicates compression. The stress acts in a plane perpendicular to the cable axis; effective confining stress is the average of the principal values in this plane.

grout_dir() → (vec3, vec3).

Get the direction vector in which cable is being loaded by the coupling spring for each end.

grout_disp() → (vec3, vec3).

Get displacement in grout (shear coupling spring) at each end ; positive/negative with respect to the average axial direction of cable.

grout_friction() → float.

Get the grout internal friction angle.

grout_perimeter() → float.

Get the grout exposed perimeter.

grout_slip() → (int, int).

Get the slip state of grout (shear coupling spring) at each end. Return value {0, 1, 2} denotes never slipped, now slipping, or slipped in the past, respectively.

grout_stiffness() → float.

Get the grout stiffness.

grout_stress() → (float, float).

Get stress in grout (shear coupling spring) at each end; positive/negative with respect to average axial direction of cable.

id() → int.

Get the Cable structural element id.

in_group(group_name: str[, slot: str]) → bool.

Test if the Cable is part of a given group. If the optional argument slot is given, only that slot is searched. Otherwise, all group slots are searched.

length() → float.

Get the length of the cable element.

local_system() → Tens3.

Get local coordinate system of this element as a 3x3 tensor.

mark() → bool.

Get the mark flag on the structural element. The structural element logic may modify this flag during command processing and cycling.

nodes() → tuple of Structural element node objects.

Get a tuple containing the structural element nodes attached to this elemment.

pos() → vec3.

Get the position vector of the element, defined as the element centroid.

set_area(float) → None.

Set the cross-section area of the cable element.

set_density(float) → None.

Set the density of this structural element.

set_extra(slot: int, value: any) → None.

Set the Cable extra data in the given slot.

set_group(group_name: str[, slot: str]) → None.

Set the Cable group name in a given slot.

set_grout_cohesion(float) → None.

Set the grout cohesion.

set_grout_friction(float) → None.

Set the grout internal friction angle.

set_grout_perimeter(perimeter: float) → None.

Set the grout exposed perimeter.

set_grout_stiffness(float) → None.

Set the grout stiffness.

set_mark(bool) → None.

Set the mark flag on the structural element. The structural element logic may modify this flag during command processing and cycling.

set_slide(bool) → None.

Set the boolean flag of the large-strain sliding. If True, slide is on; if False, slide is off.

set_slide_tol(bool) → None.

Set the large-strain sliding tolerance of the cable element.

set_thermal_expansion(float) → None.

Set the thermal expansion coefficient for the structural element.

set_yield_compression(float) → float.

Set the compression yield strength of the cable element.

set_yield_tension(float) → None.

Set the tension yield strength of the cable element.

set_young(float) → None.

Set the Youngs modulus of the cable element.

slide() → bool.

Get the boolean flag of the large-strain sliding. If True, slide is on; if False, slide is off.

slide_tol() → float.

Get the large-strain sliding tolerance of the cable element.

state_compression() → int.

Get the compression yield state of the cable element. The return value {0, 1, 2} denotes never yielded, now yielding, or yielded in the past, respectively.

state_tension() → int.

Get the tension yield state of cable element. The return value {0, 1, 2} denotes never yielded, now yielding, or yielded in the past, respectively.

stress_axial() → float.

Get the average axial stress of the cable element (positive: tension; negative: compression.

thermal_expansion() → float.

Get the thermal expansion coefficient for the structural element.

valid() → bool.

Returns True if this Cable is live.

volume() → float.

Get the cable element volume, or the cross-sectional area times the length.

yield_compression() → float.

Get the compression yield strength of the cable element.

yield_tension() → float.

Get the tension yield strength of the cable element.

young() → float.

Get the Youngs modulus of the cable element.