fedoo.constitutivelaw.Simcoon

class Simcoon(umat_name, props, name='')

Constitutive laws from the simcoon library.

The constitutive Law should be associated with fedoo.weakform.StressEquilibrium

Parameters:

  • umat_name (str) – Name of the constitutive law.

  • props (numpy.array) – The constitive laws properties

  • name (str) – The name of the constitutive law

Notes

UMAT compatibility with the 2Daxi ModelingSpace:

  • Isotropic UMATs (e.g. ELI, NEOH, MOON, EPICP J2 plasticity): supported. Hooke’s response and J2 invariants are invariant under the slot remapping fedoo applies in 2Daxi (cf. fedoo.core.mechanical3d.Mechanical3D).

  • Orthotropic / anisotropic UMATs (e.g. ELIO, composite Mori-Tanaka, anisotropic damage / plasticity): user-supplied material direction “3” is silently the hoop direction in 2Daxi (because slot 2 of the 6-vector carries ε_θθ). Define the stiffness / hardening parameters with this convention or the response will not match the intended material orientation.

  • Hyperelastic laws are gated on plane stress (see _Lt_from_F branch); they remain compatible with 2Daxi at finite strain provided the F[θθ] = r/R fix is in effect (see fedoo.weakform.stress_equilibrium._comp_grad_disp()).

__init__(umat_name, props, name='')

Methods

Simcoon.get_H_plane_stress(H)

Convert a full 3D tangent matrix H in an equivalent behavior in 2D with the plane stress assumption.

Simcoon.get_all()

Return a dict with all the known ConstitutiveLaw (with a name).

Simcoon.get_tangent_matrix(assembly[, dimension])

Simcoon.get_temp_gp(assembly, pb)

Get the current temperature field at Gauss Point.

Simcoon.initialize(assembly, pb)

Initialize the constitutive law for the current problem.

Simcoon.local2global_H(H)

Rotate stiffness matrix from local material frame to global frame.

Simcoon.reset()

Reset the constitutive law.

Simcoon.set_density(density)

Set the mass density associated with this mechanical material.

Simcoon.set_start(assembly, pb)

Begin a new time iteration.

Simcoon.to_start(assembly, pb)

Restart the current time iteration.

Simcoon.update(assembly, pb)

Update the constitutive law for the current problem state.

Simcoon.name

Name of the constitutive law.

Simcoon.is_initialized

Tag set to True once the law is intialized.