StrainEnergyDensity Class Reference

StrainEnergyDensity calculates the strain energy density. More...

#include <StrainEnergyDensity.h>

Inheritance diagram for StrainEnergyDensity:

Public Member Functions
	StrainEnergyDensity (const InputParameters &parameters)
virtual void	initQpStatefulProperties () override
virtual void	initialSetup () override
virtual void	computeQpProperties () override

Static Public Member Functions
static InputParameters	validParams ()

Protected Attributes
const std::string	_base_name
bool	_incremental
	Whether the material model is a total or incremental model. More...
MaterialProperty< Real > &	_strain_energy_density
	The strain energy density material property. More...
const MaterialProperty< Real > &	_strain_energy_density_old
const MaterialProperty< RankTwoTensor > &	_stress
	Current and old values of stress. More...
const MaterialProperty< RankTwoTensor > &	_stress_old
const MaterialProperty< RankTwoTensor > &	_mechanical_strain
	Current value of mechanical strain which includes elastic and inelastic components of the strain. More...
const MaterialProperty< RankTwoTensor > *	_strain_increment
	Current value of the strain increment for incremental models. More...

Detailed Description

StrainEnergyDensity calculates the strain energy density.

Definition at line 27 of file StrainEnergyDensity.h.

Constructor & Destructor Documentation

StrainEnergyDensity()

StrainEnergyDensity::StrainEnergyDensity

(

const InputParameters &

parameters

)

Definition at line 34 of file StrainEnergyDensity.C.

  : DerivativeMaterialInterface<Material>(parameters),
    _base_name(isParamValid("base_name") ? getParam<std::string>("base_name") + "_" : ""),
    _incremental(getParam<bool>("incremental")),
    _strain_energy_density(declareProperty<Real>(_base_name + "strain_energy_density")),
    _strain_energy_density_old(getMaterialPropertyOld<Real>(_base_name + "strain_energy_density")),
    _stress(getMaterialProperty<RankTwoTensor>(_base_name + "stress")),
    _stress_old(getMaterialPropertyOld<RankTwoTensor>(_base_name + "stress")),
    _mechanical_strain(getMaterialProperty<RankTwoTensor>(_base_name + "mechanical_strain")),
    _strain_increment(_incremental
                          ? &getMaterialProperty<RankTwoTensor>(_base_name + "strain_increment")
                          : nullptr)
{
}

Member Function Documentation

computeQpProperties()

void StrainEnergyDensity::computeQpProperties ( )

overridevirtual

Definition at line 64 of file StrainEnergyDensity.C.

{
 
  if (_strain_increment != nullptr)
    _strain_energy_density[_qp] =
        _strain_energy_density_old[_qp] +
        _stress[_qp].doubleContraction((*_strain_increment)[_qp]) / 2.0 +
        _stress_old[_qp].doubleContraction((*_strain_increment)[_qp]) / 2.0;
  else
    _strain_energy_density[_qp] = _stress[_qp].doubleContraction((_mechanical_strain)[_qp]) / 2.0;
}

initialSetup()

void StrainEnergyDensity::initialSetup ( )

overridevirtual

Definition at line 50 of file StrainEnergyDensity.C.

{
  if (!_incremental && hasMaterialProperty<RankTwoTensor>(_base_name + "strain_increment"))
    mooseError("StrainEnergyDensity: Specified incremental = false, but material model is "
               "incremental.");
}

initQpStatefulProperties()

void StrainEnergyDensity::initQpStatefulProperties ( )

overridevirtual

Definition at line 58 of file StrainEnergyDensity.C.

{
  _strain_energy_density[_qp] = 0.0;
}

validParams()

InputParameters StrainEnergyDensity::validParams ( )

static

Definition at line 19 of file StrainEnergyDensity.C.

{
  InputParameters params = Material::validParams();
  params.addClassDescription("Computes the strain energy density using a combination of the "
                             "elastic and inelastic components of the strain increment, which is a "
                             "valid assumption for monotonic behavior.");
  params.addParam<std::string>("base_name",
                               "Optional parameter that allows the user to define "
                               "multiple mechanics material systems on the same "
                               "block, i.e. for multiple phases");
  params.addRequiredParam<bool>(
      "incremental", "Flag to indicate whether an incremental or total model is being used.");
  return params;
}

Member Data Documentation

_base_name

const std::string StrainEnergyDensity::_base_name

protected

Definition at line 39 of file StrainEnergyDensity.h.

Referenced by initialSetup().

_incremental

bool StrainEnergyDensity::_incremental

protected

Whether the material model is a total or incremental model.

Definition at line 42 of file StrainEnergyDensity.h.

Referenced by initialSetup().

_mechanical_strain

const MaterialProperty<RankTwoTensor>& StrainEnergyDensity::_mechanical_strain

protected

Current value of mechanical strain which includes elastic and inelastic components of the strain.

Definition at line 54 of file StrainEnergyDensity.h.

Referenced by computeQpProperties().

_strain_energy_density

MaterialProperty<Real>& StrainEnergyDensity::_strain_energy_density

protected

The strain energy density material property.

Definition at line 45 of file StrainEnergyDensity.h.

Referenced by computeQpProperties(), and initQpStatefulProperties().

_strain_energy_density_old

const MaterialProperty<Real>& StrainEnergyDensity::_strain_energy_density_old

protected

Definition at line 46 of file StrainEnergyDensity.h.

Referenced by computeQpProperties().

_strain_increment

const MaterialProperty<RankTwoTensor>* StrainEnergyDensity::_strain_increment

protected

Current value of the strain increment for incremental models.

Definition at line 57 of file StrainEnergyDensity.h.

Referenced by computeQpProperties().

_stress

const MaterialProperty<RankTwoTensor>& StrainEnergyDensity::_stress

protected

Current and old values of stress.

Definition at line 49 of file StrainEnergyDensity.h.

Referenced by computeQpProperties().

_stress_old

const MaterialProperty<RankTwoTensor>& StrainEnergyDensity::_stress_old

protected

Definition at line 50 of file StrainEnergyDensity.h.

Referenced by computeQpProperties().

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The documentation for this class was generated from the following files:

• tensor_mechanics/include/materials/StrainEnergyDensity.h
• tensor_mechanics/src/materials/StrainEnergyDensity.C