ComputeInstantaneousThermalExpansionFunctionEigenstrain computes an eigenstrain for thermal expansion according to an instantaneous thermal expansion function. More...

#include <ComputeInstantaneousThermalExpansionFunctionEigenstrain.h>

Inheritance diagram for ComputeInstantaneousThermalExpansionFunctionEigenstrain:

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Public Member Functions
	ComputeInstantaneousThermalExpansionFunctionEigenstrain (const InputParameters &parameters)

Static Public Member Functions
static InputParameters	validParams ()

Protected Member Functions
virtual void	initQpStatefulProperties () override

virtual void	computeThermalStrain (Real &thermal_strain, Real &instantaneous_cte) override

virtual void	computeQpEigenstrain () override

Protected Attributes
const VariableValue &	_temperature_old

const Function &	_thermal_expansion_function

MaterialProperty< Real > &	_thermal_strain
	Stores the thermal strain as a scalar for use in computing an incremental update to this. More...

const MaterialProperty< Real > &	_thermal_strain_old

bool &	_step_one
	Indicates whether we are on the first step, avoiding false positives when restarting. More...

const VariableValue &	_temperature

MaterialProperty< RankTwoTensor > &	_deigenstrain_dT

const VariableValue &	_stress_free_temperature

Detailed Description

ComputeInstantaneousThermalExpansionFunctionEigenstrain computes an eigenstrain for thermal expansion according to an instantaneous thermal expansion function.

Definition at line 24 of file ComputeInstantaneousThermalExpansionFunctionEigenstrain.h.

Constructor & Destructor Documentation

◆ ComputeInstantaneousThermalExpansionFunctionEigenstrain()

ComputeInstantaneousThermalExpansionFunctionEigenstrain::ComputeInstantaneousThermalExpansionFunctionEigenstrain ( const InputParameters & parameters )

Definition at line 32 of file ComputeInstantaneousThermalExpansionFunctionEigenstrain.C.

   : ComputeThermalExpansionEigenstrainBase(parameters),
     _temperature_old(coupledValueOld("temperature")),
     _thermal_expansion_function(getFunction("thermal_expansion_function")),
     _thermal_strain(declareProperty<Real>("InstantaneousThermalExpansionFunction_thermal_strain")),
     _thermal_strain_old(
         getMaterialPropertyOld<Real>("InstantaneousThermalExpansionFunction_thermal_strain")),
     _step_one(declareRestartableData<bool>("step_one", true))
 {
 }

Member Function Documentation

◆ computeQpEigenstrain()

void ComputeThermalExpansionEigenstrainBase::computeQpEigenstrain ( )

overrideprotectedvirtualinherited

Definition at line 38 of file ComputeThermalExpansionEigenstrainBase.C.

 {
   Real thermal_strain = 0.0;
  
   // instantaneous_cte is just the derivative of thermal_strain with respect to temperature
   Real instantaneous_cte = 0.0;
  
   computeThermalStrain(thermal_strain, instantaneous_cte);
  
   _eigenstrain[_qp].zero();
   _eigenstrain[_qp].addIa(thermal_strain);
  
   _deigenstrain_dT[_qp].zero();
   _deigenstrain_dT[_qp].addIa(instantaneous_cte);
 }

◆ computeThermalStrain()

void ComputeInstantaneousThermalExpansionFunctionEigenstrain::computeThermalStrain	(	Real &	thermal_strain,
		Real &	instantaneous_cte
	)

overrideprotectedvirtual

Implements ComputeThermalExpansionEigenstrainBase.

Definition at line 50 of file ComputeInstantaneousThermalExpansionFunctionEigenstrain.C.

 {
   if (_t_step > 1)
     _step_one = false;
  
   const Real & current_temp = _temperature[_qp];
  
   const Real & old_thermal_strain = _thermal_strain_old[_qp];
  
   const Real & old_temp = (_step_one ? _stress_free_temperature[_qp] : _temperature_old[_qp]);
   const Real delta_T = current_temp - old_temp;
  
   const Point p;
   const Real alpha_current_temp = _thermal_expansion_function.value(current_temp, p);
   const Real alpha_old_temp = _thermal_expansion_function.value(old_temp, p);
  
   thermal_strain = old_thermal_strain + delta_T * 0.5 * (alpha_current_temp + alpha_old_temp);
   _thermal_strain[_qp] = thermal_strain;
  
   instantaneous_cte = alpha_current_temp;
 }

◆ initQpStatefulProperties()

void ComputeInstantaneousThermalExpansionFunctionEigenstrain::initQpStatefulProperties ( )

overrideprotectedvirtual

Definition at line 44 of file ComputeInstantaneousThermalExpansionFunctionEigenstrain.C.

 {
   _thermal_strain[_qp] = 0;
 }

◆ validParams()

InputParameters ComputeInstantaneousThermalExpansionFunctionEigenstrain::validParams ( )

static

Definition at line 19 of file ComputeInstantaneousThermalExpansionFunctionEigenstrain.C.

 {
   InputParameters params = ComputeThermalExpansionEigenstrainBase::validParams();
   params.addClassDescription("Computes eigenstrain due to thermal expansion using a function that "
                              "describes the instantaneous thermal expansion as a function of "
                              "temperature");
   params.addRequiredParam<FunctionName>("thermal_expansion_function",
                                         "Function describing the instantaneous thermal expansion "
                                         "coefficient as a function of temperature");
   return params;
 }