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

Static Public Member Functions
static InputParameters	validParams ()

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
const 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
const bool	_volumetric_locking_correction
const Real &	_current_elem_volume

Detailed Description

ComputeSmallStrain defines a strain tensor, assuming small strains.

Definition at line 22 of file ComputeSmallStrain.h.

Constructor & Destructor Documentation

ComputeSmallStrain()

ComputeSmallStrain::ComputeSmallStrain

(

const InputParameters &

parameters

)

Definition at line 26 of file ComputeSmallStrain.C.

  : ComputeStrainBase(parameters)
{
}

Member Function Documentation

computeProperties()

void ComputeSmallStrain::computeProperties ( )

overridevirtual

Reimplemented in Compute2DSmallStrain, Compute1DSmallStrain, and ComputeRSphericalSmallStrain.

Definition at line 32 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 94 of file ComputeStrainBase.C.

{
  // 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.");
}

Referenced by ComputeStrainBase::initialSetup().

initialSetup()

void ComputeStrainBase::initialSetup ( )

overrideinherited

Definition at line 75 of file ComputeStrainBase.C.

{
  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;
  }
}

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

initQpStatefulProperties()

void ComputeStrainBase::initQpStatefulProperties ( )

overrideprotectedvirtualinherited

Reimplemented in ComputeIncrementalStrainBase, and ComputeCosseratIncrementalSmallStrain.

Definition at line 104 of file ComputeStrainBase.C.

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

validParams()

InputParameters ComputeSmallStrain::validParams ( )

static

Definition at line 19 of file ComputeSmallStrain.C.

{
  InputParameters params = ComputeStrainBase::validParams();
  params.addClassDescription("Compute a small strain.");
  return params;
}

Referenced by Compute1DSmallStrain::validParams(), ComputeRSphericalSmallStrain::validParams(), and Compute2DSmallStrain::validParams().

Member Data Documentation

_base_name

const std::string ComputeStrainBase::_base_name

protectedinherited

Definition at line 44 of file ComputeStrainBase.h.

Referenced by ComputeStrainBase::ComputeStrainBase().

_current_elem_volume

const Real& ComputeStrainBase::_current_elem_volume

protectedinherited

Definition at line 56 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 41 of file ComputeStrainBase.h.

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

_eigenstrain_names

std::vector<MaterialPropertyName> ComputeStrainBase::_eigenstrain_names

protectedinherited

Definition at line 50 of file ComputeStrainBase.h.

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

_eigenstrains

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

protectedinherited

Definition at line 51 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 53 of file ComputeStrainBase.h.

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

_grad_disp

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

protectedinherited

Definition at line 42 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(), Compute2DSmallStrain::initialSetup(), ComputeStrainBase::initialSetup(), Compute2DFiniteStrain::initialSetup(), and Compute2DIncrementalStrain::initialSetup().

_mechanical_strain

MaterialProperty<RankTwoTensor>& ComputeStrainBase::_mechanical_strain

protectedinherited

Definition at line 46 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 40 of file ComputeStrainBase.h.

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

_total_strain

MaterialProperty<RankTwoTensor>& ComputeStrainBase::_total_strain

protectedinherited

Definition at line 48 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

const bool ComputeStrainBase::_volumetric_locking_correction

protectedinherited

Definition at line 55 of file ComputeStrainBase.h.

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