ComputeSmallStrain Class Reference

ComputeSmallStrain defines a strain tensor, assuming small strains. More...

#include <ComputeSmallStrain.h>

Inheritance diagram for ComputeSmallStrain:

Public Member Functions
	ComputeSmallStrain (const InputParameters &parameters)
virtual void	computeProperties () override
void	initialSetup () override

Protected Member Functions
virtual void	initQpStatefulProperties () override
virtual void	displacementIntegrityCheck ()

Protected Attributes
unsigned int	_ndisp
	Coupled displacement variables. More...
std::vector< const VariableValue * >	_disp
std::vector< const VariableGradient * >	_grad_disp
std::string	_base_name
MaterialProperty< RankTwoTensor > &	_mechanical_strain
MaterialProperty< RankTwoTensor > &	_total_strain
std::vector< MaterialPropertyName >	_eigenstrain_names
std::vector< const MaterialProperty< RankTwoTensor > * >	_eigenstrains
const MaterialProperty< RankTwoTensor > *	_global_strain
bool	_volumetric_locking_correction
const Real &	_current_elem_volume

Detailed Description

ComputeSmallStrain defines a strain tensor, assuming small strains.

Definition at line 23 of file ComputeSmallStrain.h.

Constructor & Destructor Documentation

ComputeSmallStrain()

ComputeSmallStrain::ComputeSmallStrain

(

const InputParameters &

parameters

)

Definition at line 25 of file ComputeSmallStrain.C.

  : ComputeStrainBase(parameters)
{
}

Member Function Documentation

computeProperties()

void ComputeSmallStrain::computeProperties ( )

overridevirtual

Reimplemented in Compute2DSmallStrain, Compute1DSmallStrain, and ComputeRSphericalSmallStrain.

Definition at line 31 of file ComputeSmallStrain.C.

{
  Real volumetric_strain = 0.0;
  for (_qp = 0; _qp < _qrule->n_points(); ++_qp)
  {
    // strain = (grad_disp + grad_disp^T)/2
    RankTwoTensor grad_tensor((*_grad_disp[0])[_qp], (*_grad_disp[1])[_qp], (*_grad_disp[2])[_qp]);

    _total_strain[_qp] = (grad_tensor + grad_tensor.transpose()) / 2.0;

    if (_volumetric_locking_correction)
      volumetric_strain += _total_strain[_qp].trace() * _JxW[_qp] * _coord[_qp];
  }

  if (_volumetric_locking_correction)
    volumetric_strain /= _current_elem_volume;

  for (_qp = 0; _qp < _qrule->n_points(); ++_qp)
  {
    if (_volumetric_locking_correction)
    {
      Real trace = _total_strain[_qp].trace();
      _total_strain[_qp](0, 0) += (volumetric_strain - trace) / 3.0;
      _total_strain[_qp](1, 1) += (volumetric_strain - trace) / 3.0;
      _total_strain[_qp](2, 2) += (volumetric_strain - trace) / 3.0;
    }

    if (_global_strain)
      _total_strain[_qp] += (*_global_strain)[_qp];

    _mechanical_strain[_qp] = _total_strain[_qp];

    // Remove the Eigen strain
    for (auto es : _eigenstrains)
      _mechanical_strain[_qp] -= (*es)[_qp];
  }
}

displacementIntegrityCheck()

void ComputeStrainBase::displacementIntegrityCheck ( )

protectedvirtualinherited

Reimplemented in Compute2DFiniteStrain, Compute2DIncrementalStrain, and Compute2DSmallStrain.

Definition at line 92 of file ComputeStrainBase.C.

Referenced by ComputeStrainBase::initialSetup().

{
  // Checking for consistency between mesh size and length of the provided displacements vector
  if (_ndisp != _mesh.dimension())
    paramError(
        "displacements",
        "The number of variables supplied in 'displacements' must match the mesh dimension.");
}

initialSetup()

void ComputeStrainBase::initialSetup ( )

overrideinherited

Definition at line 73 of file ComputeStrainBase.C.

Referenced by ComputeIncrementalStrainBase::initialSetup(), and ComputeAxisymmetric1DSmallStrain::initialSetup().

{
  displacementIntegrityCheck();
  // fetch coupled variables and gradients (as stateful properties if necessary)
  for (unsigned int i = 0; i < _ndisp; ++i)
  {
    _disp[i] = &coupledValue("displacements", i);
    _grad_disp[i] = &coupledGradient("displacements", i);
  }

  // set unused dimensions to zero
  for (unsigned i = _ndisp; i < 3; ++i)
  {
    _disp[i] = &_zero;
    _grad_disp[i] = &_grad_zero;
  }
}

initQpStatefulProperties()

void ComputeStrainBase::initQpStatefulProperties ( )

overrideprotectedvirtualinherited

Reimplemented in ComputeCosseratIncrementalSmallStrain, and ComputeIncrementalStrainBase.

Definition at line 102 of file ComputeStrainBase.C.

{
  _mechanical_strain[_qp].zero();
  _total_strain[_qp].zero();
}

Member Data Documentation

_base_name

std::string ComputeStrainBase::_base_name

protectedinherited

Definition at line 43 of file ComputeStrainBase.h.

Referenced by ComputeStrainBase::ComputeStrainBase().

_current_elem_volume

const Real& ComputeStrainBase::_current_elem_volume

protectedinherited

Definition at line 55 of file ComputeStrainBase.h.

Referenced by ComputeFiniteStrain::computeProperties(), computeProperties(), ComputeIncrementalSmallStrain::computeProperties(), Compute2DFiniteStrain::computeProperties(), and Compute2DSmallStrain::computeProperties().

_disp

std::vector<const VariableValue *> ComputeStrainBase::_disp

protectedinherited

Definition at line 40 of file ComputeStrainBase.h.

Referenced by ComputeAxisymmetric1DFiniteStrain::computeGradDispZZ(), ComputeAxisymmetric1DIncrementalStrain::computeGradDispZZ(), ComputeAxisymmetricRZIncrementalStrain::computeOutOfPlaneGradDisp(), ComputeAxisymmetricRZFiniteStrain::computeOutOfPlaneGradDisp(), ComputeAxisymmetricRZSmallStrain::computeOutOfPlaneStrain(), ComputeRSphericalSmallStrain::computeProperties(), ComputeRSphericalFiniteStrain::computeProperties(), ComputeAxisymmetric1DSmallStrain::computeStrainZZ(), ComputeRSphericalIncrementalStrain::computeTotalStrainIncrement(), Compute2DFiniteStrain::initialSetup(), Compute2DSmallStrain::initialSetup(), ComputeStrainBase::initialSetup(), and Compute2DIncrementalStrain::initialSetup().

_eigenstrain_names

std::vector<MaterialPropertyName> ComputeStrainBase::_eigenstrain_names

protectedinherited

Definition at line 49 of file ComputeStrainBase.h.

Referenced by ComputeIncrementalStrainBase::ComputeIncrementalStrainBase(), and ComputeStrainBase::ComputeStrainBase().

_eigenstrains

std::vector<const MaterialProperty<RankTwoTensor> *> ComputeStrainBase::_eigenstrains

protectedinherited

Definition at line 50 of file ComputeStrainBase.h.

Referenced by computeProperties(), ComputeRSphericalSmallStrain::computeProperties(), Compute1DSmallStrain::computeProperties(), Compute2DSmallStrain::computeProperties(), ComputeCosseratSmallStrain::computeQpProperties(), ComputeCrackTipEnrichmentSmallStrain::computeQpProperties(), ComputeStrainBase::ComputeStrainBase(), and ComputeIncrementalStrainBase::subtractEigenstrainIncrementFromStrain().

_global_strain

const MaterialProperty<RankTwoTensor>* ComputeStrainBase::_global_strain

protectedinherited

Definition at line 52 of file ComputeStrainBase.h.

Referenced by computeProperties(), and ComputeFiniteStrain::computeQpStrain().

_grad_disp

std::vector<const VariableGradient *> ComputeStrainBase::_grad_disp

protectedinherited

Definition at line 41 of file ComputeStrainBase.h.

Referenced by ComputeFiniteStrain::computeProperties(), computeProperties(), Compute1DFiniteStrain::computeProperties(), ComputeRSphericalSmallStrain::computeProperties(), Compute1DSmallStrain::computeProperties(), Compute2DFiniteStrain::computeProperties(), Compute2DSmallStrain::computeProperties(), ComputeRSphericalFiniteStrain::computeProperties(), ComputeCosseratSmallStrain::computeQpProperties(), ComputeCosseratIncrementalSmallStrain::computeQpProperties(), ComputeCrackTipEnrichmentSmallStrain::computeQpProperties(), ComputeIncrementalSmallStrain::computeTotalStrainIncrement(), Compute1DIncrementalStrain::computeTotalStrainIncrement(), ComputeRSphericalIncrementalStrain::computeTotalStrainIncrement(), Compute2DIncrementalStrain::computeTotalStrainIncrement(), Compute2DFiniteStrain::initialSetup(), Compute2DSmallStrain::initialSetup(), ComputeStrainBase::initialSetup(), and Compute2DIncrementalStrain::initialSetup().

_mechanical_strain

MaterialProperty<RankTwoTensor>& ComputeStrainBase::_mechanical_strain

protectedinherited

Definition at line 45 of file ComputeStrainBase.h.

Referenced by computeProperties(), ComputeIncrementalSmallStrain::computeProperties(), ComputeRSphericalSmallStrain::computeProperties(), Compute1DSmallStrain::computeProperties(), Compute2DSmallStrain::computeProperties(), ComputeCosseratSmallStrain::computeQpProperties(), ComputeCosseratIncrementalSmallStrain::computeQpProperties(), ComputeCrackTipEnrichmentSmallStrain::computeQpProperties(), ComputeFiniteStrain::computeQpStrain(), ComputeIncrementalStrainBase::initQpStatefulProperties(), and ComputeStrainBase::initQpStatefulProperties().

_ndisp

unsigned int ComputeStrainBase::_ndisp

protectedinherited

Coupled displacement variables.

Definition at line 39 of file ComputeStrainBase.h.

Referenced by ComputeCrackTipEnrichmentSmallStrain::ComputeCrackTipEnrichmentSmallStrain(), ComputeCrackTipEnrichmentSmallStrain::computeQpProperties(), ComputeStrainBase::ComputeStrainBase(), Compute2DIncrementalStrain::displacementIntegrityCheck(), Compute2DSmallStrain::displacementIntegrityCheck(), Compute2DFiniteStrain::displacementIntegrityCheck(), ComputeStrainBase::displacementIntegrityCheck(), ComputeIncrementalStrainBase::initialSetup(), and ComputeStrainBase::initialSetup().

_total_strain

MaterialProperty<RankTwoTensor>& ComputeStrainBase::_total_strain

protectedinherited

Definition at line 47 of file ComputeStrainBase.h.

Referenced by computeProperties(), ComputeIncrementalSmallStrain::computeProperties(), ComputeRSphericalSmallStrain::computeProperties(), Compute1DSmallStrain::computeProperties(), Compute2DSmallStrain::computeProperties(), ComputeCosseratSmallStrain::computeQpProperties(), ComputeCosseratIncrementalSmallStrain::computeQpProperties(), ComputeCrackTipEnrichmentSmallStrain::computeQpProperties(), ComputeFiniteStrain::computeQpStrain(), ComputeIncrementalStrainBase::initQpStatefulProperties(), and ComputeStrainBase::initQpStatefulProperties().

_volumetric_locking_correction

bool ComputeStrainBase::_volumetric_locking_correction

protectedinherited

Definition at line 54 of file ComputeStrainBase.h.

Referenced by ComputeFiniteStrain::computeProperties(), computeProperties(), ComputeIncrementalSmallStrain::computeProperties(), Compute2DFiniteStrain::computeProperties(), Compute2DSmallStrain::computeProperties(), and ComputeStrainBase::ComputeStrainBase().

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

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