ComputeMeanThermalExpansionEigenstrainBase is a base class for computing the thermal expansion eigenstrain according to a temperature-dependent mean thermal expansion defined in a derived class. More...

#include <ComputeMeanThermalExpansionEigenstrainBase.h>

Inheritance diagram for ComputeMeanThermalExpansionEigenstrainBaseTempl< is_ad >:

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Public Types
typedef DerivativeMaterialPropertyNameInterface::SymbolName	SymbolName

Public Member Functions
	ComputeMeanThermalExpansionEigenstrainBaseTempl (const InputParameters &parameters)

virtual void	subdomainSetup () final
	resize _temperature_buffer

virtual void	computeProperties () final
	update _temperature_buffer

virtual void	computeQpEigenstrain () override

const GenericMaterialProperty< U, is_ad > &	getDefaultMaterialProperty (const std::string &name)

const GenericMaterialProperty< U, is_ad > &	getDefaultMaterialPropertyByName (const std::string &name)

void	validateDerivativeMaterialPropertyBase (const std::string &base)

const MaterialPropertyName	derivativePropertyName (const MaterialPropertyName &base, const std::vector< SymbolName > &c) const

const MaterialPropertyName	derivativePropertyNameFirst (const MaterialPropertyName &base, const SymbolName &c1) const

const MaterialPropertyName	derivativePropertyNameSecond (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2) const

const MaterialPropertyName	derivativePropertyNameThird (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2, const SymbolName &c3) const

GenericMaterialProperty< U, is_ad > &	declarePropertyDerivative (const std::string &base, const std::vector< VariableName > &c)

GenericMaterialProperty< U, is_ad > &	declarePropertyDerivative (const std::string &base, const std::vector< SymbolName > &c)

GenericMaterialProperty< U, is_ad > &	declarePropertyDerivative (const std::string &base, const SymbolName &c1, const SymbolName &c2="", const SymbolName &c3="")

GenericMaterialProperty< U, is_ad > &	declarePropertyDerivative (const std::string &base, const std::vector< VariableName > &c)

GenericMaterialProperty< U, is_ad > &	declarePropertyDerivative (const std::string &base, const std::vector< SymbolName > &c)

GenericMaterialProperty< U, is_ad > &	declarePropertyDerivative (const std::string &base, const SymbolName &c1, const SymbolName &c2="", const SymbolName &c3="")

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const std::vector< VariableName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const std::vector< SymbolName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const SymbolName &c1, const SymbolName &c2="", const SymbolName &c3="")

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const SymbolName &c1, unsigned int v2, unsigned int v3=libMesh::invalid_uint)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, unsigned int v1, unsigned int v2=libMesh::invalid_uint, unsigned int v3=libMesh::invalid_uint)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const std::vector< VariableName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const std::vector< SymbolName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const SymbolName &c1, const SymbolName &c2="", const SymbolName &c3="")

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, const SymbolName &c1, unsigned int v2, unsigned int v3=libMesh::invalid_uint)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivative (const std::string &base, unsigned int v1, unsigned int v2=libMesh::invalid_uint, unsigned int v3=libMesh::invalid_uint)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivativeByName (const MaterialPropertyName &base, const std::vector< VariableName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivativeByName (const MaterialPropertyName &base, const std::vector< SymbolName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivativeByName (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2="", const SymbolName &c3="")

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivativeByName (const MaterialPropertyName &base, const std::vector< VariableName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivativeByName (const MaterialPropertyName &base, const std::vector< SymbolName > &c)

const GenericMaterialProperty< U, is_ad > &	getMaterialPropertyDerivativeByName (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2="", const SymbolName &c3="")

void	validateCoupling (const MaterialPropertyName &base, const std::vector< VariableName > &c, bool validate_aux=true)

void	validateCoupling (const MaterialPropertyName &base, const VariableName &c1="", const VariableName &c2="", const VariableName &c3="")

void	validateCoupling (const MaterialPropertyName &base, const std::vector< VariableName > &c, bool validate_aux=true)

void	validateCoupling (const MaterialPropertyName &base, const VariableName &c1="", const VariableName &c2="", const VariableName &c3="")

void	validateNonlinearCoupling (const MaterialPropertyName &base, const VariableName &c1="", const VariableName &c2="", const VariableName &c3="")

void	validateNonlinearCoupling (const MaterialPropertyName &base, const VariableName &c1="", const VariableName &c2="", const VariableName &c3="")

const MaterialPropertyName	propertyName (const MaterialPropertyName &base, const std::vector< SymbolName > &c) const

const MaterialPropertyName	propertyName (const MaterialPropertyName &base, const std::vector< SymbolName > &c) const

const MaterialPropertyName	propertyNameFirst (const MaterialPropertyName &base, const SymbolName &c1) const

const MaterialPropertyName	propertyNameFirst (const MaterialPropertyName &base, const SymbolName &c1) const

const MaterialPropertyName	propertyNameSecond (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2) const

const MaterialPropertyName	propertyNameSecond (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2) const

const MaterialPropertyName	propertyNameThird (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2, const SymbolName &c3) const

const MaterialPropertyName	propertyNameThird (const MaterialPropertyName &base, const SymbolName &c1, const SymbolName &c2, const SymbolName &c3) const

Static Public Member Functions
static InputParameters	validParams ()

Protected Member Functions
virtual ValueAndDerivative< is_ad >	computeThermalStrain () override
	Compute the total thermal strain relative to the stress-free temperature at the current temperature along with its temperature derivative.

virtual Real	referenceTemperature ()=0
	Get the reference temperature for the mean thermal expansion relationship.

virtual ValueAndDerivative< is_ad >	meanThermalExpansionCoefficient (const ValueAndDerivative< is_ad > &temperature)=0

Protected Attributes
const Real	_thermal_expansion_scale_factor
	Scalar multiplier applied to the strain for sensitivity studies and debugging.

const std::vector< ValueAndDerivative< is_ad > > &	_temperature
	Temperature to use in the eigenstrain calculation (current value if _use_old_temperature=false, old value if _use_old_temperature=true).

const bool	_use_old_temperature
	lag temperature variable

const VariableValue &	_temperature_old
	previous time step temperature

MaterialProperty< RankTwoTensor > *	_deigenstrain_dT

const VariableValue &	_stress_free_temperature

Private Member Functions
bool	haveMaterialProperty (const std::string &prop_name)

std::vector< VariableName >	buildVariableVector (const VariableName &c1, const VariableName &c2, const VariableName &c3)

void	validateCouplingHelper (const MaterialPropertyName &base, const std::vector< VariableName > &c, const System &system, std::vector< VariableName > &missing)

bool	isNotObjectVariable (const VariableName &name)

Private Attributes
std::vector< ValueAndDerivative< is_ad > >	_temperature_buffer
	Temperature used in the eigenstrain calculation (current value if _use_old_temperature=false, old value if _use_old_temperature=true).

const GenericVariableValue< is_ad > &	_temperature_prop
	current temperature

MaterialProperty< Real > *	_mean_thermal_expansion_coefficient
	mean coefficient of thermal expansion (for output verification)

FEProblemBase &	_dmi_fe_problem

Detailed Description

template<bool is_ad>
class ComputeMeanThermalExpansionEigenstrainBaseTempl< is_ad >

ComputeMeanThermalExpansionEigenstrainBase is a base class for computing the thermal expansion eigenstrain according to a temperature-dependent mean thermal expansion defined in a derived class.

This is defined as the total total linear strain ( \(\delta L / L\)) at a given temperature relative to a reference temperature at which \(\delta L = 0\).

Based on: M. Niffenegger and K. Reichlin. The proper use of thermal expansion coefficients in finite element calculations. Nuclear Engineering and Design, 243:356-359, Feb. 2012.

Definition at line 26 of file ComputeMeanThermalExpansionEigenstrainBase.h.

Constructor & Destructor Documentation

◆ ComputeMeanThermalExpansionEigenstrainBaseTempl()

template<bool is_ad>

ComputeMeanThermalExpansionEigenstrainBaseTempl< is_ad >::ComputeMeanThermalExpansionEigenstrainBaseTempl ( const InputParameters & parameters )

Definition at line 31 of file ComputeMeanThermalExpansionEigenstrainBase.C.

  : ComputeThermalExpansionEigenstrainBaseTempl<is_ad>(parameters),
    _thermal_expansion_scale_factor(this->template getParam<Real>("thermal_expansion_scale_factor"))
{
}

Member Function Documentation

◆ computeProperties()

template<bool is_ad>

void ComputeThermalExpansionEigenstrainBaseTempl< is_ad >::computeProperties ( )

finalvirtualinherited

update _temperature_buffer

Definition at line 71 of file ComputeThermalExpansionEigenstrainBase.C.

{
  // we need to convert the temperature variable to a ChainedReal in the is_ad == false case
  for (_qp = 0; _qp < this->_qrule->n_points(); ++_qp)
    if constexpr (is_ad)
      _temperature_buffer[_qp] =
          _use_old_temperature ? _temperature_old[_qp] : _temperature_prop[_qp];
    else
    {
      if (_use_old_temperature)
        _temperature_buffer[_qp] = {_temperature_old[_qp], 0};
      else
        _temperature_buffer[_qp] = {_temperature_prop[_qp], 1};
    }
 
  ComputeEigenstrainBaseTempl<is_ad>::computeProperties();
}

◆ computeQpEigenstrain()

template<bool is_ad>

void ComputeThermalExpansionEigenstrainBaseTempl< is_ad >::computeQpEigenstrain ( )

overridevirtualinherited

Definition at line 91 of file ComputeThermalExpansionEigenstrainBase.C.

{
  _eigenstrain[_qp].zero();
  const auto thermal_strain = computeThermalStrain();
 
  if constexpr (is_ad)
  {
    _eigenstrain[_qp].addIa(thermal_strain);
    if (_mean_thermal_expansion_coefficient)
    {
      if (_temperature[_qp] == _stress_free_temperature[_qp])
        (*_mean_thermal_expansion_coefficient)[_qp] = 0.0;
      else
        (*_mean_thermal_expansion_coefficient)[_qp] = MetaPhysicL::raw_value(
            thermal_strain / (_temperature[_qp] - _stress_free_temperature[_qp]));
    }
  }
  else
  {
    _eigenstrain[_qp].addIa(thermal_strain.value());
    if (_mean_thermal_expansion_coefficient)
    {
      if (_temperature[_qp].value() == _stress_free_temperature[_qp])
        (*_mean_thermal_expansion_coefficient)[_qp] = 0.0;
      else
        (*_mean_thermal_expansion_coefficient)[_qp] =
            thermal_strain.value() / (_temperature[_qp].value() - _stress_free_temperature[_qp]);
    }
    if (_deigenstrain_dT)
    {
      (*_deigenstrain_dT)[_qp].zero();
      if (!_use_old_temperature)
        (*_deigenstrain_dT)[_qp].addIa(thermal_strain.derivatives());
    }
  }
}

◆ computeThermalStrain()

template<bool is_ad>

ValueAndDerivative< is_ad > ComputeMeanThermalExpansionEigenstrainBaseTempl< is_ad >::computeThermalStrain ( )

overrideprotectedvirtual

Compute the total thermal strain relative to the stress-free temperature at the current temperature along with its temperature derivative.

Implements ComputeThermalExpansionEigenstrainBaseTempl< is_ad >.

Definition at line 39 of file ComputeMeanThermalExpansionEigenstrainBase.C.

{
  const auto reference_temperature = referenceTemperature();
 
  const auto current_alphabar = meanThermalExpansionCoefficient(this->_temperature[_qp]);
  const auto thexp_T = current_alphabar * (this->_temperature[_qp] - reference_temperature);
 
  // Mean linear thermal expansion coefficient relative to the reference temperature
  // evaluated at stress_free_temperature.  This is
  // \f$\bar{\alpha} = (\delta L(T_{sf}) / L) / (T_{sf} - T_{ref})\f$
  // where \f$T_sf\f$ is the stress-free temperature and \f$T_{ref}\f$ is the reference temperature.
  const auto alphabar_stress_free_temperature =
      meanThermalExpansionCoefficient(this->_stress_free_temperature[_qp]);
 
  // Thermal expansion relative to the reference temperature evaluated at stress_free_temperature
  // \f$(\delta L(T_sf) / L)\f$, where \f$T_sf\f$ is the stress-free temperature.
  const auto thexp_stress_free_temperature =
      alphabar_stress_free_temperature *
      (this->_stress_free_temperature[_qp] - referenceTemperature());
 
  // Per M. Niffenegger and K. Reichlin (2012), thermal_strain should be divided
  // by (1.0 + thexp_stress_free_temperature) to account for the ratio of
  // the length at the stress-free temperature to the length at the reference
  // temperature. It can be neglected because it is very close to 1,
  // but we include it for completeness here.
 
  auto thermal_strain =
      (thexp_T - thexp_stress_free_temperature) / (1.0 + thexp_stress_free_temperature);
 
  return _thermal_expansion_scale_factor * thermal_strain;
}

◆ meanThermalExpansionCoefficient()

template<bool is_ad>

virtual ValueAndDerivative< is_ad > ComputeMeanThermalExpansionEigenstrainBaseTempl< is_ad >::meanThermalExpansionCoefficient ( const ValueAndDerivative< is_ad > & temperature )

protectedpure virtual

Implemented in ComputeMeanThermalExpansionFunctionEigenstrainTempl< is_ad >.

◆ referenceTemperature()

template<bool is_ad>

virtual Real ComputeMeanThermalExpansionEigenstrainBaseTempl< is_ad >::referenceTemperature ( )

protectedpure virtual

Get the reference temperature for the mean thermal expansion relationship.

This is the temperature at which \(\delta L = 0\).

Implemented in ComputeMeanThermalExpansionFunctionEigenstrainTempl< is_ad >.

◆ subdomainSetup()

template<bool is_ad>

void ComputeThermalExpansionEigenstrainBaseTempl< is_ad >::subdomainSetup ( )

finalvirtualinherited

resize _temperature_buffer

Definition at line 59 of file ComputeThermalExpansionEigenstrainBase.C.

{
  // call parent class subdomain setup, which ultimately calls Material::subdomainSetup()
  ComputeEigenstrainBaseTempl<is_ad>::subdomainSetup();
 
  // make sure we have enouch space to hold the augmented temperature values
  const auto nqp = this->_fe_problem.getMaxQps();
  _temperature_buffer.resize(nqp);
}

◆ validParams()

template<bool is_ad>

InputParameters ComputeMeanThermalExpansionEigenstrainBaseTempl< is_ad >::validParams ( )

static

Definition at line 15 of file ComputeMeanThermalExpansionEigenstrainBase.C.

{
  InputParameters params = ComputeThermalExpansionEigenstrainBaseTempl<is_ad>::validParams();
  params.addClassDescription("Base class for models that compute eigenstrain due to mean"
                             "thermal expansion as a function of temperature");
  params.addParam<Real>("thermal_expansion_scale_factor",
                        1.0,
                        "Scaling factor on the thermal expansion strain. This input parameter can "
                        "be used to perform sensitivity analysis on thermal expansion.");
  params.addParamNamesToGroup("thermal_expansion_scale_factor", "Advanced");
 
  return params;
}