ComputeStrainIncrementBasedStress.C

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html
 
#include "ComputeStrainIncrementBasedStress.h"
 
registerMooseObject("SolidMechanicsApp", ComputeStrainIncrementBasedStress);
 
InputParameters
ComputeStrainIncrementBasedStress::validParams()
{
  InputParameters params = ComputeStressBase::validParams();
  params.addClassDescription("Compute stress after subtracting inelastic strain increments");
  params.addParam<std::vector<MaterialPropertyName>>(
      "inelastic_strain_names", {}, "Names of inelastic strain properties");
 
  return params;
}
 
ComputeStrainIncrementBasedStress::ComputeStrainIncrementBasedStress(
    const InputParameters & parameters)
  : ComputeStressBase(parameters),
    _elasticity_tensor_name(_base_name + "elasticity_tensor"),
    _elasticity_tensor(getMaterialPropertyByName<RankFourTensor>(_elasticity_tensor_name)),
    _stress_old(getMaterialPropertyOld<RankTwoTensor>(_base_name + "stress")),
    _mechanical_strain_old(
        getMaterialPropertyOldByName<RankTwoTensor>(_base_name + "mechanical_strain")),
    _inelastic_strain_names(getParam<std::vector<MaterialPropertyName>>("inelastic_strain_names"))
{
  _num_inelastic_strain_models = _inelastic_strain_names.size();
 
  if (_num_inelastic_strain_models > 0)
  {
    _inelastic_strains.resize(_num_inelastic_strain_models);
    _inelastic_strains_old.resize(_num_inelastic_strain_models);
 
    for (unsigned int i = 0; i < _num_inelastic_strain_models; ++i)
    {
      _inelastic_strains[i] = &getMaterialProperty<RankTwoTensor>(_inelastic_strain_names[i]);
      _inelastic_strains_old[i] =
          &getMaterialPropertyOld<RankTwoTensor>(_inelastic_strain_names[i]);
    }
  }
}
 
void
ComputeStrainIncrementBasedStress::computeQpStress()
{
  RankTwoTensor elastic_strain_increment = (_mechanical_strain[_qp] - _mechanical_strain_old[_qp]);
 
  for (unsigned int i = 0; i < _num_inelastic_strain_models; ++i)
    elastic_strain_increment -= (*_inelastic_strains[i])[_qp] - (*_inelastic_strains_old[i])[_qp];
 
  _stress[_qp] = _stress_old[_qp] + _elasticity_tensor[_qp] * elastic_strain_increment;
 
  computeQpJacobian();
}
 
void
ComputeStrainIncrementBasedStress::computeQpJacobian()
{
  _Jacobian_mult[_qp] = _elasticity_tensor[_qp];
}