4.1.1.6.1.4. pyfem.materials.Dummy module

class Dummy(props)

Bases: BaseMaterial

Dummy material model for interface elements.

This is a simple linear elastic material model used primarily for testing and interface elements. It provides a diagonal stiffness matrix scaled by a material parameter D.

H

Material stiffness matrix (diagonal).

Type:

ndarray

outLabels

Labels for output variables (normal and tangential tractions).

Type:

list of str

D

Material stiffness parameter (inherited from props).

Type:

float

Notes

The material supports 2D (rank=2) and 3D (rank=3) interface elements with normal and tangential traction components.

getStress(deformation) → Tuple[ndarray, ndarray]

Compute stress (traction) and material tangent matrix.

Parameters:

deformation (object) – Deformation object containing the strain field. Must have a strain attribute (ndarray).

Returns:

• sigma (ndarray) – Stress (traction) vector.

• H (ndarray) – Material tangent stiffness matrix.

getTangent() → ndarray

Get the material tangent stiffness matrix.

Returns:

Material tangent stiffness matrix H.

Return type:

ndarray