4.1.1.2.1.11. pyfem.elements.PhaseField module

class PhaseField(elnodes, props)

Bases: Element

strain2matrix(strain)

Gives the strain in matrix format.

getDecompEnergy(strain)

Decomposes the Energy in a positive part due to tension and a negative part due to compression.

getTangentStiffness(elemdat)

Calculates the tangent stiffness matrix and the internal force vector of the PhaseField model.

getInternalForce(elemdat)

Returns the internal force vector of the PhaseField model.

commit(elemdat)

Copies the new history parameters (maximum internal energy for each integration point) to the old history parameters.

getBmatrix(dphi)

Calculates the B-matrix (eps = B * u) vfor the mechanical part of the PhaseField model. The dimensions of the B-matrix are determined by the rank of the problem and the length of the matrix containing derivatives of the shape functions (dphi)

splitDofIDs(n)

Routine to split the dof IDs in two groups, one for the displacement degrees of freedom, the second for the phase field degres of freedom. n is the number of degrees of freedom in this model