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ComputeMeanThermalExpansionFunctionEigenstrain Class Reference

ComputeMeanThermalExpansionFunctionEigenstrain computes an eigenstrain for thermal expansion according to a mean thermal expansion function. More...

#include <ComputeMeanThermalExpansionFunctionEigenstrain.h>

Inheritance diagram for ComputeMeanThermalExpansionFunctionEigenstrain:
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Public Member Functions

 ComputeMeanThermalExpansionFunctionEigenstrain (const InputParameters &parameters)
 

Protected Member Functions

virtual Real referenceTemperature () override
 
virtual Real meanThermalExpansionCoefficient (const Real temperature) override
 
virtual Real meanThermalExpansionCoefficientDerivative (const Real temperature) override
 
virtual void computeThermalStrain (Real &thermal_strain, Real &instantaneous_cte) override
 
virtual void computeQpEigenstrain () override
 

Protected Attributes

Function & _thermal_expansion_function
 
const Real & _thexp_func_ref_temp
 
const VariableValue & _temperature
 
MaterialProperty< RankTwoTensor > & _deigenstrain_dT
 
const VariableValue & _stress_free_temperature
 

Detailed Description

ComputeMeanThermalExpansionFunctionEigenstrain computes an eigenstrain for thermal expansion according to a mean thermal expansion function.

Definition at line 21 of file ComputeMeanThermalExpansionFunctionEigenstrain.h.

Constructor & Destructor Documentation

ComputeMeanThermalExpansionFunctionEigenstrain::ComputeMeanThermalExpansionFunctionEigenstrain ( const InputParameters &  parameters)

Definition at line 27 of file ComputeMeanThermalExpansionFunctionEigenstrain.C.

30  _thermal_expansion_function(getFunction("thermal_expansion_function")),
31  _thexp_func_ref_temp(getParam<Real>("thermal_expansion_function_reference_temperature"))
32 {
33 }
ComputeMeanThermalExpansionEigenstrainBase(const InputParameters &parameters)

Member Function Documentation

void ComputeThermalExpansionEigenstrainBase::computeQpEigenstrain ( )
overrideprotectedvirtualinherited

Definition at line 34 of file ComputeThermalExpansionEigenstrainBase.C.

35 {
36  Real thermal_strain = 0.0;
37  Real instantaneous_cte = 0.0;
38 
39  computeThermalStrain(thermal_strain, instantaneous_cte);
40 
41  _eigenstrain[_qp].zero();
42  _eigenstrain[_qp].addIa(thermal_strain);
43 
44  _deigenstrain_dT[_qp].zero();
45  _deigenstrain_dT[_qp].addIa(instantaneous_cte);
46 }
virtual void computeThermalStrain(Real &thermal_strain, Real &instantaneous_cte)=0
void ComputeMeanThermalExpansionEigenstrainBase::computeThermalStrain ( Real &  thermal_strain,
Real &  instantaneous_cte 
)
overrideprotectedvirtualinherited

Implements ComputeThermalExpansionEigenstrainBase.

Definition at line 27 of file ComputeMeanThermalExpansionEigenstrainBase.C.

29 {
30  const Real small = libMesh::TOLERANCE;
31 
32  const Real reference_temperature = referenceTemperature();
33  const Real & current_temp = _temperature[_qp];
34  const Real current_alphabar = meanThermalExpansionCoefficient(current_temp);
35  const Real thexp_current_temp = current_alphabar * (current_temp - reference_temperature);
36 
37  // Mean linear thermal expansion coefficient relative to the reference temperature
38  // evaluated at stress_free_temperature. This is
39  // \f$\bar{\alpha} = (\delta L(T_{sf}) / L) / (T_{sf} - T_{ref})\f$
40  // where \f$T_sf\f$ is the stress-free temperature and \f$T_{ref}\f$ is the reference temperature.
41  const Real alphabar_stress_free_temperature =
43  // Thermal expansion relative to the reference temperature evaluated at stress_free_temperature
44  // \f$(\delta L(T_sf) / L)\f$, where \f$T_sf\f$ is the stress-free temperature.
45  const Real thexp_stress_free_temperature =
46  alphabar_stress_free_temperature * (_stress_free_temperature[_qp] - referenceTemperature());
47 
48  // Per M. Niffenegger and K. Reichlin (2012), thermal_strain should be divided
49  // by (1.0 + thexp_stress_free_temperature) to account for the ratio of
50  // the length at the stress-free temperature to the length at the reference
51  // temperature. It can be neglected because it is very close to 1,
52  // but we include it for completeness here.
53 
54  thermal_strain =
55  (thexp_current_temp - thexp_stress_free_temperature) / (1.0 + thexp_stress_free_temperature);
56 
57  const Real dalphabar_dT = meanThermalExpansionCoefficientDerivative(current_temp);
58  const Real numerator = dalphabar_dT * (current_temp - reference_temperature) + current_alphabar;
59  const Real denominator =
60  1.0 +
61  alphabar_stress_free_temperature * (_stress_free_temperature[_qp] - reference_temperature);
62  if (denominator < small)
63  mooseError("Denominator too small in thermal strain calculation");
64  instantaneous_cte = numerator / denominator;
65 }
virtual Real meanThermalExpansionCoefficientDerivative(const Real temperature)=0
virtual Real meanThermalExpansionCoefficient(const Real temperature)=0
Real ComputeMeanThermalExpansionFunctionEigenstrain::meanThermalExpansionCoefficient ( const Real  temperature)
overrideprotectedvirtual
Real ComputeMeanThermalExpansionFunctionEigenstrain::meanThermalExpansionCoefficientDerivative ( const Real  temperature)
overrideprotectedvirtual

Implements ComputeMeanThermalExpansionEigenstrainBase.

Definition at line 49 of file ComputeMeanThermalExpansionFunctionEigenstrain.C.

51 {
52  return _thermal_expansion_function.timeDerivative(temperature, Point());
53 }
const std::string temperature
Definition: NS.h:25
Real ComputeMeanThermalExpansionFunctionEigenstrain::referenceTemperature ( )
overrideprotectedvirtual

Member Data Documentation

MaterialProperty<RankTwoTensor>& ComputeThermalExpansionEigenstrainBase::_deigenstrain_dT
protectedinherited
const VariableValue& ComputeThermalExpansionEigenstrainBase::_stress_free_temperature
protectedinherited
const VariableValue& ComputeThermalExpansionEigenstrainBase::_temperature
protectedinherited
Function& ComputeMeanThermalExpansionFunctionEigenstrain::_thermal_expansion_function
protected
const Real& ComputeMeanThermalExpansionFunctionEigenstrain::_thexp_func_ref_temp
protected

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