#include <PowerLawCreepModel.h>

Inheritance diagram for PowerLawCreepModel:

Public Member Functions
	PowerLawCreepModel (const InputParameters &parameters)

virtual void	initQpStatefulProperties () override

virtual void	computeStress (const Elem &current_elem, const SymmElasticityTensor &elasticityTensor, const SymmTensor &stress_old, SymmTensor &strain_increment, SymmTensor &stress_new) override

void	computeStress (const Elem &current_elem, const SymmElasticityTensor &elasticityTensor, const SymmTensor &stress_old, SymmTensor &strain_increment, SymmTensor &stress_new, SymmTensor &inelastic_strain_increment)
	Compute stress by performing return mapping iterations. More...

virtual Real	computeReferenceResidual (const Real effective_trial_stress, const Real scalar) override
	Compute a reference quantity to be used for checking relative convergence. More...

Real	computeTimeStepLimit ()
	Compute the limiting value of the time step for this material. More...

virtual Real	minimumPermissibleValue (const Real) const override
	Compute the minimum permissible value of the scalar. More...

void	outputIterationSummary (std::stringstream *iter_output, const unsigned int total_it) override
	Output summary information for the convergence history of the model. More...

void	setQp (unsigned int qp)
	Sets the value of the variable _qp for inheriting classes. More...

virtual bool	modifyStrainIncrement (const Elem &, SymmTensor &strain_increment, SymmTensor &d_strain_dT)

virtual bool	updateElasticityTensor (SymmElasticityTensor &)

virtual bool	applyThermalStrain (SymmTensor &strain_increment, SymmTensor &d_strain_dT)

Static Public Member Functions
static InputParameters	validParams ()

Protected Member Functions
virtual void	computeStressInitialize (Real effectiveTrialStress, const SymmElasticityTensor &elasticityTensor) override
	Perform any necessary initialization before return mapping iterations. More...

virtual void	computeStressFinalize (const SymmTensor &plasticStrainIncrement) override
	Perform any necessary steps to finalize state after return mapping iterations. More...

virtual Real	computeResidual (const Real effectiveTrialStress, const Real scalar) override
	Compute the residual for a predicted value of the scalar. More...

virtual Real	computeDerivative (const Real effectiveTrialStress, const Real scalar) override
	Compute the derivative of the residual as a function of the scalar variable. More...

void	returnMappingSolve (const Real effective_trial_stress, Real &scalar, const ConsoleStream &console)
	Perform the return mapping iterations. More...

virtual Real	maximumPermissibleValue (const Real effective_trial_stress) const
	Compute the maximum permissible value of the scalar. More...

virtual Real	initialGuess (const Real)
	Compute an initial guess for the value of the scalar. More...

virtual void	iterationFinalize (Real)
	Finalize internal state variables for a model for a given iteration. More...

virtual void	outputIterationStep (std::stringstream *iter_output, const unsigned int it, const Real effective_trial_stress, const Real scalar, const Real residual, const Real reference_residual)
	Output information for a single iteration step to build the convergence history of the model. More...

Protected Attributes
const Real	_coefficient

const Real	_n_exponent

const Real	_m_exponent

const Real	_activation_energy

const Real	_gas_constant

const Real	_start_time

Real	_shear_modulus

Real	_exponential

Real	_expTime

MaterialProperty< SymmTensor > &	_creep_strain

const MaterialProperty< SymmTensor > &	_creep_strain_old

Real	_effective_strain_increment

Real	_three_shear_modulus
	3 * shear modulus More...

MaterialProperty< Real > &	_effective_inelastic_strain

const MaterialProperty< Real > &	_effective_inelastic_strain_old

Real	_max_inelastic_increment

const bool	_compute_matl_timestep_limit

MaterialProperty< Real > *	_matl_timestep_limit

const bool	_has_temp

const VariableValue &	_temperature

const VariableValue &	_temperature_old

const Real	_alpha

const Function *	_alpha_function

bool	_has_stress_free_temp

Real	_stress_free_temp

bool	_mean_alpha_function

Real	_ref_temp

bool	_check_range
	Whether to check to see whether iterative solution is within admissible range, and set within that range if outside. More...

bool	_line_search
	Whether to use line searches to improve convergence. More...

bool	_bracket_solution
	Whether to save upper and lower bounds of root for scalar, and set solution to the midpoint between those bounds if outside them. More...


bool &	_step_zero_cm
	Restartable data to check for the zeroth and first time steps. More...

bool &	_step_one_cm

Private Types
enum	InternalSolveOutput { InternalSolveOutput::NEVER, InternalSolveOutput::ON_ERROR, InternalSolveOutput::ALWAYS }

enum	SolveState { SolveState::SUCCESS, SolveState::NAN_INF, SolveState::EXCEEDED_ITERATIONS }

Private Member Functions
SolveState	internalSolve (const Real effective_trial_stress, Real &scalar, std::stringstream *iter_output=nullptr)
	Method called from within this class to perform the actual return mappping iterations. More...

bool	converged (const Real residual, const Real reference)
	Check to see whether the residual is within the convergence limits. More...

bool	convergedAcceptable (const unsigned int it, const Real residual, const Real reference)
	Check to see whether the residual is within acceptable convergence limits. More...

void	checkPermissibleRange (Real &scalar, Real &scalar_increment, const Real scalar_old, const Real min_permissible_scalar, const Real max_permissible_scalar, std::stringstream *iter_output)
	Check to see whether solution is within admissible range, and set it within that range if it is not. More...

void	updateBounds (const Real scalar, const Real residual, const Real init_resid_sign, Real &scalar_upper_bound, Real &scalar_lower_bound, std::stringstream *iter_output)
	Update the upper and lower bounds of the root for the effective inelastic strain. More...

Private Attributes
enum SingleVariableReturnMappingSolution::InternalSolveOutput	_internal_solve_output_on

const unsigned int	_max_its
	Maximum number of return mapping iterations. More...

const bool	_internal_solve_full_iteration_history
	Whether to output iteration information all the time (regardless of whether iterations converge) More...

Real	_relative_tolerance
	Relative convergence tolerance. More...

Real	_absolute_tolerance
	Absolute convergence tolerance. More...

Real	_acceptable_multiplier
	Multiplier applied to relative and absolute tolerances for acceptable convergence. More...

const std::size_t	_num_resids
	Number of residuals to be stored in history. More...

std::vector< Real >	_residual_history
	History of residuals used to check whether progress is still being made on decreasing the residual. More...

unsigned int	_iteration
	iteration number More...

const std::string	_svrms_name
	MOOSE input name of the object performing the solve. More...


Real	_initial_residual
	Residual values, kept as members to retain solver state for summary outputting. More...

Real	_residual

Detailed Description

Definition at line 19 of file PowerLawCreepModel.h.

Member Enumeration Documentation

◆ InternalSolveOutput

enum SingleVariableReturnMappingSolution::InternalSolveOutput

strongprivateinherited

Enumerator
NEVER
ON_ERROR
ALWAYS

Definition at line 130 of file SingleVariableReturnMappingSolution.h.

   {
     NEVER,
     ON_ERROR,
     ALWAYS
   } _internal_solve_output_on;

◆ SolveState

enum SingleVariableReturnMappingSolution::SolveState

strongprivateinherited

Enumerator
SUCCESS
NAN_INF
EXCEEDED_ITERATIONS

Definition at line 137 of file SingleVariableReturnMappingSolution.h.

   {
     SUCCESS,
     NAN_INF,
     EXCEEDED_ITERATIONS
   };

Constructor & Destructor Documentation

◆ PowerLawCreepModel()

PowerLawCreepModel::PowerLawCreepModel ( const InputParameters & parameters )

Definition at line 33 of file PowerLawCreepModel.C.

   : ReturnMappingModel(parameters, "creep"),
     _coefficient(parameters.get<Real>("coefficient")),
     _n_exponent(parameters.get<Real>("n_exponent")),
     _m_exponent(parameters.get<Real>("m_exponent")),
     _activation_energy(parameters.get<Real>("activation_energy")),
     _gas_constant(parameters.get<Real>("gas_constant")),
     _start_time(getParam<Real>("start_time")),
     _creep_strain(declareProperty<SymmTensor>("creep_strain")),
     _creep_strain_old(getMaterialPropertyOld<SymmTensor>("creep_strain"))
 {
 }

Member Function Documentation

◆ applyThermalStrain()

bool ConstitutiveModel::applyThermalStrain	(	SymmTensor &	strain_increment,
		SymmTensor &	d_strain_dT
	)

virtualinherited

Definition at line 106 of file ConstitutiveModel.C.

 {
   if (_t_step >= 1)
     _step_zero_cm = false;
  
   if (_t_step >= 2)
     _step_one_cm = false;
  
   if (_has_temp && !_step_zero_cm)
   {
     Real inc_thermal_strain;
     Real d_thermal_strain_d_temp;
  
     Real old_temp;
     if (_step_one_cm && _has_stress_free_temp)
       old_temp = _stress_free_temp;
     else
       old_temp = _temperature_old[_qp];
  
     Real current_temp = _temperature[_qp];
  
     Real delta_t = current_temp - old_temp;
  
     Real alpha = _alpha;
  
     if (_alpha_function)
     {
       Point p;
       Real alpha_current_temp = _alpha_function->value(current_temp, p);
       Real alpha_old_temp = _alpha_function->value(old_temp, p);
       Real alpha_stress_free_temperature = _alpha_function->value(_stress_free_temp, p);
  
       if (_mean_alpha_function)
       {
         Real small(1e-6);
  
         Real numerator = alpha_current_temp * (current_temp - _ref_temp) -
                          alpha_old_temp * (old_temp - _ref_temp);
         Real denominator = 1.0 + alpha_stress_free_temperature * (_stress_free_temp - _ref_temp);
         if (denominator < small)
           mooseError("Denominator too small in thermal strain calculation");
         inc_thermal_strain = numerator / denominator;
         d_thermal_strain_d_temp = alpha_current_temp * (current_temp - _ref_temp);
       }
       else
       {
         inc_thermal_strain = delta_t * 0.5 * (alpha_current_temp + alpha_old_temp);
         d_thermal_strain_d_temp = alpha_current_temp;
       }
     }
     else
     {
       inc_thermal_strain = delta_t * alpha;
       d_thermal_strain_d_temp = alpha;
     }
  
     strain_increment.addDiag(-inc_thermal_strain);
     d_strain_dT.addDiag(-d_thermal_strain_d_temp);
   }
  
   bool modified = true;
   return modified;
 }

Referenced by ConstitutiveModel::modifyStrainIncrement().

◆ checkPermissibleRange()

void SingleVariableReturnMappingSolution::checkPermissibleRange	(	Real &	scalar,
		Real &	scalar_increment,
		const Real	scalar_old,
		const Real	min_permissible_scalar,
		const Real	max_permissible_scalar,
		std::stringstream *	iter_output
	)

privateinherited

Check to see whether solution is within admissible range, and set it within that range if it is not.

Parameters

scalar	Current value of the inelastic strain increment
scalar_increment	Incremental change in scalar from the previous iteration
scalar_old	Previous value of scalar
min_permissible_scalar	Minimum permissible value of scalar
max_permissible_scalar	Maximum permissible value of scalar
iter_output	Output stream

Definition at line 356 of file SingleVariableReturnMappingSolution.C.

 {
   if (scalar > max_permissible_scalar)
   {
     scalar_increment = (max_permissible_scalar - scalar_old) / 2.0;
     scalar = scalar_old + scalar_increment;
     if (iter_output)
       *iter_output << "Scalar greater than maximum (" << max_permissible_scalar
                    << ") adjusted scalar=" << scalar << " scalar_increment=" << scalar_increment
                    << std::endl;
   }
   else if (scalar < min_permissible_scalar)
   {
     scalar_increment = (min_permissible_scalar - scalar_old) / 2.0;
     scalar = scalar_old + scalar_increment;
     if (iter_output)
       *iter_output << "Scalar less than minimum (" << min_permissible_scalar
                    << ") adjusted scalar=" << scalar << " scalar_increment=" << scalar_increment
                    << std::endl;
   }
 }

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ computeDerivative()

Real PowerLawCreepModel::computeDerivative	(	const Real	effective_trial_stress,
		const Real	scalar
	)

overrideprotectedvirtual

Compute the derivative of the residual as a function of the scalar variable.

The residual should be in strain increment units for all models for consistency.

Parameters

effective_trial_stress	Effective trial stress
scalar	Inelastic strain increment magnitude being solved for

Implements SingleVariableReturnMappingSolution.

Definition at line 84 of file PowerLawCreepModel.C.

 {
   return -3.0 * _coefficient * _shear_modulus * _n_exponent *
              std::pow(effectiveTrialStress - 3.0 * _shear_modulus * scalar, _n_exponent - 1.0) *
              _exponential * _expTime * _dt -
          1.0;
 }

◆ computeReferenceResidual()

Real ReturnMappingModel::computeReferenceResidual	(	const Real	effective_trial_stress,
		const Real	scalar
	)

overridevirtualinherited

Compute a reference quantity to be used for checking relative convergence.

This should be in strain increment units for all models for consistency.

Parameters

effective_trial_stress	Effective trial stress
scalar	Inelastic strain increment magnitude being solved for

Implements SingleVariableReturnMappingSolution.

Definition at line 135 of file ReturnMappingModel.C.

 {
   return effective_trial_stress / _three_shear_modulus - scalar;
 }

◆ computeResidual()

Real PowerLawCreepModel::computeResidual	(	const Real	effective_trial_stress,
		const Real	scalar
	)

overrideprotectedvirtual

Compute the residual for a predicted value of the scalar.

This residual should be in strain increment units for all models for consistency.

Parameters

effective_trial_stress	Effective trial stress
scalar	Inelastic strain increment magnitude being solved for

Implements SingleVariableReturnMappingSolution.

Definition at line 76 of file PowerLawCreepModel.C.

 {
   const Real stress_delta = effectiveTrialStress - 3.0 * _shear_modulus * scalar;
   Real creep_rate = _coefficient * std::pow(stress_delta, _n_exponent) * _exponential * _expTime;
   return creep_rate * _dt - scalar;
 }

◆ computeStress() [1/2]

void ReturnMappingModel::computeStress	(	const Elem &	current_elem,
		const SymmElasticityTensor &	elasticityTensor,
		const SymmTensor &	stress_old,
		SymmTensor &	strain_increment,
		SymmTensor &	stress_new
	)

overridevirtualinherited

Reimplemented from ConstitutiveModel.

Definition at line 53 of file ReturnMappingModel.C.

 {
   // Given the stretching, compute the stress increment and add it to the old stress. Also update
   // the creep strain
   // stress = stressOld + stressIncrement
   if (_t_step == 0 && !_app.isRestarting())
   {
     if (_compute_matl_timestep_limit)
       (*_matl_timestep_limit)[_qp] = std::numeric_limits<Real>::max();
     return;
   }
  
   stress_new = elasticityTensor * strain_increment;
   stress_new += stress_old;
  
   SymmTensor inelastic_strain_increment;
   computeStress(current_elem,
                 elasticityTensor,
                 stress_old,
                 strain_increment,
                 stress_new,
                 inelastic_strain_increment);
 }

◆ computeStress() [2/2]

void ReturnMappingModel::computeStress	(	const Elem &	current_elem,
		const SymmElasticityTensor &	elasticityTensor,
		const SymmTensor &	stress_old,
		SymmTensor &	strain_increment,
		SymmTensor &	stress_new,
		SymmTensor &	inelastic_strain_increment
	)

inherited

Compute stress by performing return mapping iterations.

This can be called either from within this model, or by an external model that combines multiple inelastic models.

Parameters

current_elem	Current element
elasticityTensor	Elasticity tensor
stress_old	Old state of stress
strain_increment	Strain increment
stress_new	New state of stress
inelastic_strain_increment	Inelastic strain increment

Definition at line 82 of file ReturnMappingModel.C.

 {
   // compute deviatoric trial stress
   SymmTensor dev_trial_stress(stress_new);
   dev_trial_stress.addDiag(-dev_trial_stress.trace() / 3.0);
  
   // compute effective trial stress
   Real dts_squared = dev_trial_stress.doubleContraction(dev_trial_stress);
   Real effective_trial_stress = std::sqrt(1.5 * dts_squared);
  
   // compute effective strain increment
   SymmTensor dev_strain_increment(strain_increment);
   dev_strain_increment.addDiag(-strain_increment.trace() / 3.0);
   _effective_strain_increment = dev_strain_increment.doubleContraction(dev_strain_increment);
   _effective_strain_increment = std::sqrt(2.0 / 3.0 * _effective_strain_increment);
  
   const SymmIsotropicElasticityTensor * iso_e_t =
       dynamic_cast<const SymmIsotropicElasticityTensor *>(&elasticityTensor);
   if (!iso_e_t)
     mooseError("Models derived from ReturnMappingModel require a SymmIsotropicElasticityTensor");
   _three_shear_modulus = 3.0 * iso_e_t->shearModulus();
  
   computeStressInitialize(effective_trial_stress, elasticityTensor);
  
   Real scalar;
   returnMappingSolve(effective_trial_stress, scalar, _console);
  
   // compute inelastic and elastic strain increments
   if (scalar != 0.0)
     inelastic_strain_increment = dev_trial_stress * (1.5 * scalar / effective_trial_stress);
   else
     inelastic_strain_increment = 0.0;
  
   strain_increment -= inelastic_strain_increment;
   _effective_inelastic_strain[_qp] = _effective_inelastic_strain_old[_qp] + scalar;
  
   // compute stress increment
   stress_new = elasticityTensor * strain_increment;
  
   // update stress
   stress_new += stress_old;
  
   computeStressFinalize(inelastic_strain_increment);
   if (_compute_matl_timestep_limit)
     (*_matl_timestep_limit)[_qp] = computeTimeStepLimit();
 }

◆ computeStressFinalize()

void PowerLawCreepModel::computeStressFinalize ( const SymmTensor & )

overrideprotectedvirtual

Perform any necessary steps to finalize state after return mapping iterations.

Parameters

inelasticStrainIncrement Inelastic strain increment

Reimplemented from ReturnMappingModel.

Definition at line 70 of file PowerLawCreepModel.C.

 {
   _creep_strain[_qp] += plasticStrainIncrement;
 }

◆ computeStressInitialize()

void PowerLawCreepModel::computeStressInitialize	(	Real	,
		const SymmElasticityTensor &
	)

overrideprotectedvirtual

Perform any necessary initialization before return mapping iterations.

Parameters

effectiveTrialStress	Effective trial stress
elasticityTensor	Elasticity tensor

Reimplemented from ReturnMappingModel.

Definition at line 47 of file PowerLawCreepModel.C.

 {
   const SymmIsotropicElasticityTensor * eT =
       dynamic_cast<const SymmIsotropicElasticityTensor *>(&elasticityTensor);
   if (!eT)
   {
     mooseError("PowerLawCreepModel requires a SymmIsotropicElasticityTensor");
   }
   _shear_modulus = eT->shearModulus();
  
   _exponential = 1;
   if (_has_temp)
   {
     _exponential = std::exp(-_activation_energy / (_gas_constant * _temperature[_qp]));
   }
  
   _expTime = std::pow(_t - _start_time, _m_exponent);
  
   _creep_strain[_qp] = _creep_strain_old[_qp];
 }

◆ computeTimeStepLimit()

Real ReturnMappingModel::computeTimeStepLimit ( )

inherited

Compute the limiting value of the time step for this material.

Returns: Limiting time step

Definition at line 141 of file ReturnMappingModel.C.

 {
   Real scalar_inelastic_strain_incr;
  
   scalar_inelastic_strain_incr =
       _effective_inelastic_strain[_qp] - _effective_inelastic_strain_old[_qp];
   if (MooseUtils::absoluteFuzzyEqual(scalar_inelastic_strain_incr, 0.0))
     return std::numeric_limits<Real>::max();
  
   return _dt * _max_inelastic_increment / scalar_inelastic_strain_incr;
 }

Referenced by ReturnMappingModel::computeStress().

◆ converged()

bool SingleVariableReturnMappingSolution::converged	(	const Real	residual,
		const Real	reference
	)

privateinherited

Check to see whether the residual is within the convergence limits.

Parameters

residual	Current value of the residual
reference	Current value of the reference quantity

Returns: Whether the model converged

Definition at line 298 of file SingleVariableReturnMappingSolution.C.

 {
   return (std::abs(residual) <= _absolute_tolerance ||
           std::abs(residual / reference) <= _relative_tolerance);
 }

Referenced by SingleVariableReturnMappingSolution::convergedAcceptable(), and SingleVariableReturnMappingSolution::internalSolve().

◆ convergedAcceptable()

bool SingleVariableReturnMappingSolution::convergedAcceptable	(	const unsigned int	it,
		const Real	residual,
		const Real	reference
	)

privateinherited

Check to see whether the residual is within acceptable convergence limits.

This will only return true if it has been determined that progress is no longer being made and that the residual is within the acceptable limits.

Parameters

residual	Current iteration count
residual	Current value of the residual
reference	Current value of the reference quantity

Returns: Whether the model converged

Definition at line 305 of file SingleVariableReturnMappingSolution.C.

 {
   // Require that we have at least done _num_resids evaluations before we allow for
   // acceptable convergence
   if (it < _num_resids)
     return false;
  
   // Check to see whether the residual has dropped by convergence_history_factor over
   // the last _num_resids iterations. If it has (which means it's still making progress),
   // don't consider it to be converged within the acceptable limits.
   const Real convergence_history_factor = 10.0;
   if (std::abs(residual * convergence_history_factor) <
       std::abs(_residual_history[(it + 1) % _num_resids]))
     return false;
  
   // Now that it's determined that progress is not being made, treat it as converged if
   // we're within the acceptable convergence limits
   return converged(residual / _acceptable_multiplier, reference);
 }

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ initialGuess()

virtual Real SingleVariableReturnMappingSolution::initialGuess ( const Real )

inlineprotectedvirtualinherited

Compute an initial guess for the value of the scalar.

For some cases, an intellegent starting point can provide enhanced robustness in the Newton iterations. This is also an opportunity for classes that derive from this to perform initialization tasks.

Parameters

effective_trial_stress Effective trial stress

Definition at line 64 of file SingleVariableReturnMappingSolution.h.

64 { return 0.0; }

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ initQpStatefulProperties()

void ReturnMappingModel::initQpStatefulProperties ( )

overridevirtualinherited

Reimplemented in CLSHPlasticModel, and IsotropicPlasticity.

Definition at line 47 of file ReturnMappingModel.C.

 {
   _effective_inelastic_strain[_qp] = 0.0;
 }

Referenced by IsotropicPlasticity::initQpStatefulProperties(), and CLSHPlasticModel::initQpStatefulProperties().

◆ internalSolve()

SingleVariableReturnMappingSolution::SolveState SingleVariableReturnMappingSolution::internalSolve	(	const Real	effective_trial_stress,
		Real &	scalar,
		std::stringstream *	iter_output = `nullptr`
	)

privateinherited

Method called from within this class to perform the actual return mappping iterations.

Parameters

effective_trial_stress	Effective trial stress
scalar	Inelastic strain increment magnitude being solved for
iter_output	Output stream – if null, no output is produced

Returns: Whether the solution was successful

Definition at line 157 of file SingleVariableReturnMappingSolution.C.

 {
   scalar = initialGuess(effective_trial_stress);
   Real scalar_old = scalar;
   Real scalar_increment = 0.0;
   const Real min_permissible_scalar = minimumPermissibleValue(effective_trial_stress);
   const Real max_permissible_scalar = maximumPermissibleValue(effective_trial_stress);
   Real scalar_upper_bound = max_permissible_scalar;
   Real scalar_lower_bound = min_permissible_scalar;
   _iteration = 0;
  
   _initial_residual = _residual = computeResidual(effective_trial_stress, scalar);
  
   Real residual_old = _residual;
   Real init_resid_sign = MathUtils::sign(_residual);
   Real reference_residual = computeReferenceResidual(effective_trial_stress, scalar);
  
   if (converged(_residual, reference_residual))
   {
     iterationFinalize(scalar);
     outputIterationStep(
         iter_output, _iteration, effective_trial_stress, scalar, _residual, reference_residual);
     return SolveState::SUCCESS;
   }
  
   _residual_history.assign(_num_resids, std::numeric_limits<Real>::max());
   _residual_history[0] = _residual;
  
   while (_iteration < _max_its && !converged(_residual, reference_residual) &&
          !convergedAcceptable(_iteration, _residual, reference_residual))
   {
     scalar_increment = -_residual / computeDerivative(effective_trial_stress, scalar);
     scalar = scalar_old + scalar_increment;
  
     if (_check_range)
       checkPermissibleRange(scalar,
                             scalar_increment,
                             scalar_old,
                             min_permissible_scalar,
                             max_permissible_scalar,
                             iter_output);
  
     _residual = computeResidual(effective_trial_stress, scalar);
     reference_residual = computeReferenceResidual(effective_trial_stress, scalar);
     iterationFinalize(scalar);
  
     if (_bracket_solution)
       updateBounds(
           scalar, _residual, init_resid_sign, scalar_upper_bound, scalar_lower_bound, iter_output);
  
     if (converged(_residual, reference_residual))
     {
       outputIterationStep(
           iter_output, _iteration, effective_trial_stress, scalar, _residual, reference_residual);
       break;
     }
     else
     {
       bool modified_increment = false;
  
       // Line Search
       if (_line_search)
       {
         if (residual_old - _residual != 0.0)
         {
           Real alpha = residual_old / (residual_old - _residual);
           alpha = MathUtils::clamp(alpha, 1.0e-2, 1.0);
  
           if (alpha != 1.0)
           {
             modified_increment = true;
             scalar_increment *= alpha;
             if (iter_output)
               *iter_output << "  Line search alpha = " << alpha
                            << " increment = " << scalar_increment << std::endl;
           }
         }
       }
  
       if (_bracket_solution)
       {
         // Check to see whether trial scalar_increment is outside the bounds, and set it to a point
         // within the bounds if it is
         if (scalar_old + scalar_increment >= scalar_upper_bound ||
             scalar_old + scalar_increment <= scalar_lower_bound)
         {
           if (scalar_upper_bound != max_permissible_scalar &&
               scalar_lower_bound != min_permissible_scalar)
           {
             const Real frac = 0.5;
             scalar_increment =
                 (1.0 - frac) * scalar_lower_bound + frac * scalar_upper_bound - scalar_old;
             modified_increment = true;
             if (iter_output)
               *iter_output << "  Trial scalar_increment exceeded bounds.  Setting between "
                               "lower/upper bounds. frac: "
                            << frac << std::endl;
           }
         }
       }
  
       // Update the trial scalar and recompute residual if the line search or bounds checking
       // modified the increment
       if (modified_increment)
       {
         scalar = scalar_old + scalar_increment;
         _residual = computeResidual(effective_trial_stress, scalar);
         reference_residual = computeReferenceResidual(effective_trial_stress, scalar);
         iterationFinalize(scalar);
  
         if (_bracket_solution)
           updateBounds(scalar,
                        _residual,
                        init_resid_sign,
                        scalar_upper_bound,
                        scalar_lower_bound,
                        iter_output);
       }
     }
  
     outputIterationStep(
         iter_output, _iteration, effective_trial_stress, scalar, _residual, reference_residual);
  
     ++_iteration;
     residual_old = _residual;
     scalar_old = scalar;
     _residual_history[_iteration % _num_resids] = _residual;
   }
  
   if (std::isnan(_residual) || std::isinf(_residual))
     return SolveState::NAN_INF;
  
   if (_iteration == _max_its)
     return SolveState::EXCEEDED_ITERATIONS;
  
   return SolveState::SUCCESS;
 }

Referenced by SingleVariableReturnMappingSolution::returnMappingSolve().

◆ iterationFinalize()

virtual void SingleVariableReturnMappingSolution::iterationFinalize ( Real )

inlineprotectedvirtualinherited

Finalize internal state variables for a model for a given iteration.

Parameters

scalar Inelastic strain increment magnitude being solved for

Reimplemented in IsotropicPlasticityStressUpdate, IsotropicPlasticity, and CLSHPlasticModel.

Definition at line 94 of file SingleVariableReturnMappingSolution.h.

94 {}

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ maximumPermissibleValue()

Real SingleVariableReturnMappingSolution::maximumPermissibleValue ( const Real effective_trial_stress ) const

protectedvirtualinherited

Compute the maximum permissible value of the scalar.

For some models, the magnitude of this may be known.

Parameters

effective_trial_stress Effective trial stress

Reimplemented in RadialReturnStressUpdate.

Definition at line 89 of file SingleVariableReturnMappingSolution.C.

 {
   return std::numeric_limits<Real>::max();
 }

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ minimumPermissibleValue()

virtual Real ReturnMappingModel::minimumPermissibleValue ( const effective_trial_stress ) const

inlineoverridevirtualinherited

Compute the minimum permissible value of the scalar.

For some models, the magnitude of this may be known.

Parameters

effective_trial_stress Effective trial stress

Reimplemented from SingleVariableReturnMappingSolution.

Definition at line 67 of file ReturnMappingModel.h.

   {
     return 0.0;
   }

◆ modifyStrainIncrement()

virtual bool ConstitutiveModel::modifyStrainIncrement	(	const Elem &	,
		SymmTensor &	strain_increment,
		SymmTensor &	d_strain_dT
	)

inlinevirtualinherited

Reimplemented in CombinedCreepPlasticity.

Definition at line 38 of file ConstitutiveModel.h.

   {
     return applyThermalStrain(strain_increment, d_strain_dT);
   }

◆ outputIterationStep()

void SingleVariableReturnMappingSolution::outputIterationStep	(	std::stringstream *	iter_output,
		const unsigned int	it,
		const Real	effective_trial_stress,
		const Real	scalar,
		const Real	residual,
		const Real	reference_residual
	)

protectedvirtualinherited

Output information for a single iteration step to build the convergence history of the model.

Parameters

iter_output	Output stream
it	Current iteration count
effective_trial_stress	Effective trial stress
scalar	Inelastic strain increment magnitude being solved for
residual	Current value of the residual
reference	Current value of the reference quantity

Definition at line 328 of file SingleVariableReturnMappingSolution.C.

 {
   if (iter_output)
   {
     *iter_output << " iteration=" << it << " trial_stress=" << effective_trial_stress
                  << " scalar=" << scalar << " residual=" << residual
                  << " ref_res=" << reference_residual
                  << " rel_res=" << std::abs(residual) / reference_residual
                  << " rel_tol=" << _relative_tolerance << " abs_res=" << std::abs(residual)
                  << " abs_tol=" << _absolute_tolerance << '\n';
   }
 }

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ outputIterationSummary()

void ReturnMappingModel::outputIterationSummary	(	std::stringstream *	iter_output,
		const unsigned int	total_it
	)

overridevirtualinherited

Output summary information for the convergence history of the model.

Parameters

iter_output	Output stream
total_it	Total iteration count

Reimplemented from SingleVariableReturnMappingSolution.

Definition at line 154 of file ReturnMappingModel.C.

 {
   if (iter_output)
   {
     *iter_output << "At element " << _current_elem->id() << " _qp=" << _qp << " Coordinates "
                  << _q_point[_qp] << " block=" << _current_elem->subdomain_id() << '\n';
   }
   SingleVariableReturnMappingSolution::outputIterationSummary(iter_output, total_it);
 }

◆ returnMappingSolve()

void SingleVariableReturnMappingSolution::returnMappingSolve	(	const Real	effective_trial_stress,
		Real &	scalar,
		const ConsoleStream &	console
	)

protectedinherited

Perform the return mapping iterations.

Parameters

effective_trial_stress	Effective trial stress
scalar	Inelastic strain increment magnitude being solved for
console	Console output

Definition at line 96 of file SingleVariableReturnMappingSolution.C.

 {
   // construct the stringstream here only if the debug level is set to ALL
   std::unique_ptr<std::stringstream> iter_output =
       (_internal_solve_output_on == InternalSolveOutput::ALWAYS)
           ? libmesh_make_unique<std::stringstream>()
           : nullptr;
  
   // do the internal solve and capture iteration info during the first round
   // iff full history output is requested regardless of whether the solve failed or succeeded
   auto solve_state =
       internalSolve(effective_trial_stress,
                     scalar,
                     _internal_solve_full_iteration_history ? iter_output.get() : nullptr);
   if (solve_state != SolveState::SUCCESS &&
       _internal_solve_output_on != InternalSolveOutput::ALWAYS)
   {
     // output suppressed by user, throw immediately
     if (_internal_solve_output_on == InternalSolveOutput::NEVER)
       throw MooseException("");
  
     // user expects some kind of output, if necessary setup output stream now
     if (!iter_output)
       iter_output = libmesh_make_unique<std::stringstream>();
  
     // add the appropriate error message to the output
     switch (solve_state)
     {
       case SolveState::NAN_INF:
         *iter_output << "Encountered inf or nan in material return mapping iterations.\n";
         break;
  
       case SolveState::EXCEEDED_ITERATIONS:
         *iter_output << "Exceeded maximum iterations in material return mapping iterations.\n";
         break;
  
       default:
         mooseError("Unhandled solver state");
     }
  
     // if full history output is only requested for failed solves we have to repeat
     // the solve a second time
     if (_internal_solve_full_iteration_history)
       internalSolve(effective_trial_stress, scalar, iter_output.get());
  
     // Append summary and throw exception
     outputIterationSummary(iter_output.get(), _iteration);
     throw MooseException(iter_output->str());
   }
  
   if (_internal_solve_output_on == InternalSolveOutput::ALWAYS)
   {
     // the solve did not fail but the user requested debug output anyways
     outputIterationSummary(iter_output.get(), _iteration);
     console << iter_output->str();
   }
 }

Referenced by ReturnMappingModel::computeStress(), and RadialReturnStressUpdate::updateState().

◆ setQp()

void ConstitutiveModel::setQp ( unsigned int qp )

inherited

Sets the value of the variable _qp for inheriting classes.

Definition at line 89 of file ConstitutiveModel.C.

 {
   _qp = qp;
 }

Referenced by CombinedCreepPlasticity::computeStress().

◆ updateBounds()

void SingleVariableReturnMappingSolution::updateBounds	(	const Real	scalar,
		const Real	residual,
		const Real	init_resid_sign,
		Real &	scalar_upper_bound,
		Real &	scalar_lower_bound,
		std::stringstream *	iter_output
	)

privateinherited

Update the upper and lower bounds of the root for the effective inelastic strain.

Parameters

scalar	Current value of the inelastic strain increment
residual	Current value of the residual
init_resid_sign	Sign of the initial value of the residual
scalar_upper_bound	Upper bound value of scalar
scalar_lower_bound	Lower bound value of scalar
iter_output	Output stream

Definition at line 384 of file SingleVariableReturnMappingSolution.C.

 {
   // Update upper/lower bounds as applicable
   if (residual * init_resid_sign < 0.0 && scalar < scalar_upper_bound)
   {
     scalar_upper_bound = scalar;
     if (scalar_upper_bound < scalar_lower_bound)
     {
       scalar_upper_bound = scalar_lower_bound;
       scalar_lower_bound = 0.0;
       if (iter_output)
         *iter_output << "  Corrected for scalar_upper_bound < scalar_lower_bound" << std::endl;
     }
   }
   // Don't permit setting scalar_lower_bound > scalar_upper_bound (but do permit the reverse).
   // This ensures that if we encounter multiple roots, we pick the lowest one.
   else if (residual * init_resid_sign > 0.0 && scalar > scalar_lower_bound &&
            scalar < scalar_upper_bound)
     scalar_lower_bound = scalar;
 }

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ updateElasticityTensor()

virtual bool ConstitutiveModel::updateElasticityTensor ( SymmElasticityTensor & )

inlinevirtualinherited

Definition at line 44 of file ConstitutiveModel.h.

44 { return false; }

◆ validParams()

InputParameters SingleVariableReturnMappingSolution::validParams ( )

staticinherited

Definition at line 28 of file SingleVariableReturnMappingSolution.C.

 {
   InputParameters params = emptyInputParameters();
  
   // Newton iteration control parameters
   params.addParam<Real>(
       "relative_tolerance", 1e-8, "Relative convergence tolerance for Newton iteration");
   params.addParam<Real>(
       "absolute_tolerance", 1e-11, "Absolute convergence tolerance for Newton iteration");
   params.addParam<Real>("acceptable_multiplier",
                         10,
                         "Factor applied to relative and absolute "
                         "tolerance for acceptable convergence if "
                         "iterations are no longer making progress");
  
   // diagnostic output parameters
   MooseEnum internal_solve_output_on_enum("never on_error always", "on_error");
   params.addParam<MooseEnum>("internal_solve_output_on",
                              internal_solve_output_on_enum,
                              "When to output internal Newton solve information");
   params.addParam<bool>("internal_solve_full_iteration_history",
                         false,
                         "Set true to output full internal Newton iteration history at times "
                         "determined by `internal_solve_output_on`. If false, only a summary is "
                         "output.");
   params.addParamNamesToGroup("internal_solve_output_on internal_solve_full_iteration_history",
                               "Debug");
  
   return params;
 }

Referenced by RadialReturnStressUpdate::validParams().

Member Data Documentation

◆ _absolute_tolerance

Real SingleVariableReturnMappingSolution::_absolute_tolerance

privateinherited

Absolute convergence tolerance.

Definition at line 155 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::converged(), and SingleVariableReturnMappingSolution::outputIterationStep().

◆ _acceptable_multiplier

Real SingleVariableReturnMappingSolution::_acceptable_multiplier

privateinherited

Multiplier applied to relative and absolute tolerances for acceptable convergence.

Definition at line 158 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::convergedAcceptable().

◆ _activation_energy

const Real PowerLawCreepModel::_activation_energy

protected

Definition at line 35 of file PowerLawCreepModel.h.

Referenced by computeStressInitialize().

◆ _alpha

const Real ConstitutiveModel::_alpha

protectedinherited

Definition at line 52 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain().

◆ _alpha_function

const Function* ConstitutiveModel::_alpha_function

protectedinherited

Definition at line 53 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain(), and ConstitutiveModel::ConstitutiveModel().

◆ _bracket_solution

bool SingleVariableReturnMappingSolution::_bracket_solution

protectedinherited

Whether to save upper and lower bounds of root for scalar, and set solution to the midpoint between those bounds if outside them.

Definition at line 127 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ _check_range

bool SingleVariableReturnMappingSolution::_check_range

protectedinherited

Whether to check to see whether iterative solution is within admissible range, and set within that range if outside.

Definition at line 120 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ _coefficient

const Real PowerLawCreepModel::_coefficient

protected

Definition at line 32 of file PowerLawCreepModel.h.

Referenced by computeDerivative(), and computeResidual().

◆ _compute_matl_timestep_limit

const bool ReturnMappingModel::_compute_matl_timestep_limit

protectedinherited

Definition at line 100 of file ReturnMappingModel.h.

Referenced by ReturnMappingModel::computeStress().

◆ _creep_strain

MaterialProperty<SymmTensor>& PowerLawCreepModel::_creep_strain

protected

Definition at line 43 of file PowerLawCreepModel.h.

Referenced by computeStressFinalize(), and computeStressInitialize().

◆ _creep_strain_old

const MaterialProperty<SymmTensor>& PowerLawCreepModel::_creep_strain_old

protected

Definition at line 44 of file PowerLawCreepModel.h.

Referenced by computeStressInitialize().

◆ _effective_inelastic_strain

MaterialProperty<Real>& ReturnMappingModel::_effective_inelastic_strain

protectedinherited

Definition at line 97 of file ReturnMappingModel.h.

Referenced by ReturnMappingModel::computeStress(), ReturnMappingModel::computeTimeStepLimit(), and ReturnMappingModel::initQpStatefulProperties().

◆ _effective_inelastic_strain_old

const MaterialProperty<Real>& ReturnMappingModel::_effective_inelastic_strain_old

protectedinherited

Definition at line 98 of file ReturnMappingModel.h.

Referenced by IsotropicTempDepHardening::computeHardeningDerivative(), IsotropicPlasticity::computeHardeningDerivative(), IsotropicTempDepHardening::computeHardeningValue(), IsotropicPlasticity::computeHardeningValue(), ReturnMappingModel::computeStress(), and ReturnMappingModel::computeTimeStepLimit().

◆ _effective_strain_increment

Real ReturnMappingModel::_effective_strain_increment

protectedinherited

Definition at line 92 of file ReturnMappingModel.h.

Referenced by ReturnMappingModel::computeStress().

◆ _exponential

Real PowerLawCreepModel::_exponential

protected

Definition at line 40 of file PowerLawCreepModel.h.

Referenced by computeDerivative(), computeResidual(), and computeStressInitialize().

◆ _expTime

Real PowerLawCreepModel::_expTime

protected

Definition at line 41 of file PowerLawCreepModel.h.

Referenced by computeDerivative(), computeResidual(), and computeStressInitialize().

◆ _gas_constant

const Real PowerLawCreepModel::_gas_constant

protected

Definition at line 36 of file PowerLawCreepModel.h.

Referenced by computeStressInitialize().

◆ _has_stress_free_temp

bool ConstitutiveModel::_has_stress_free_temp

protectedinherited

Definition at line 54 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain().

◆ _has_temp

const bool ConstitutiveModel::_has_temp

protectedinherited

Definition at line 49 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain(), computeStressInitialize(), and ConstitutiveModel::ConstitutiveModel().

◆ _initial_residual

Real SingleVariableReturnMappingSolution::_initial_residual

privateinherited

Residual values, kept as members to retain solver state for summary outputting.

Definition at line 170 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::internalSolve(), and SingleVariableReturnMappingSolution::outputIterationSummary().

◆ _internal_solve_full_iteration_history

const bool SingleVariableReturnMappingSolution::_internal_solve_full_iteration_history

privateinherited

Whether to output iteration information all the time (regardless of whether iterations converge)

Definition at line 149 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::returnMappingSolve().

◆ _internal_solve_output_on

enum SingleVariableReturnMappingSolution::InternalSolveOutput SingleVariableReturnMappingSolution::_internal_solve_output_on

privateinherited

Referenced by SingleVariableReturnMappingSolution::returnMappingSolve().

◆ _iteration

unsigned int SingleVariableReturnMappingSolution::_iteration

privateinherited

iteration number

Definition at line 167 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::internalSolve(), and SingleVariableReturnMappingSolution::returnMappingSolve().

◆ _line_search

bool SingleVariableReturnMappingSolution::_line_search

protectedinherited

Whether to use line searches to improve convergence.

Definition at line 123 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ _m_exponent

const Real PowerLawCreepModel::_m_exponent

protected

Definition at line 34 of file PowerLawCreepModel.h.

Referenced by computeStressInitialize().

◆ _matl_timestep_limit

MaterialProperty<Real>* ReturnMappingModel::_matl_timestep_limit

protectedinherited

Definition at line 101 of file ReturnMappingModel.h.

◆ _max_inelastic_increment

Real ReturnMappingModel::_max_inelastic_increment

protectedinherited

Definition at line 99 of file ReturnMappingModel.h.

Referenced by ReturnMappingModel::computeTimeStepLimit().

◆ _max_its

const unsigned int SingleVariableReturnMappingSolution::_max_its

privateinherited

Maximum number of return mapping iterations.

This exists only to avoid an infinite loop, and is is intended to be a large number that is not settable by the user.

Definition at line 146 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::internalSolve().

◆ _mean_alpha_function

bool ConstitutiveModel::_mean_alpha_function

protectedinherited

Definition at line 56 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain(), and ConstitutiveModel::ConstitutiveModel().

◆ _n_exponent

const Real PowerLawCreepModel::_n_exponent

protected

Definition at line 33 of file PowerLawCreepModel.h.

Referenced by computeDerivative(), and computeResidual().

◆ _num_resids

const std::size_t SingleVariableReturnMappingSolution::_num_resids

privateinherited

Number of residuals to be stored in history.

Definition at line 161 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::convergedAcceptable(), and SingleVariableReturnMappingSolution::internalSolve().

◆ _ref_temp

Real ConstitutiveModel::_ref_temp

protectedinherited

Definition at line 57 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain(), and ConstitutiveModel::ConstitutiveModel().

◆ _relative_tolerance

Real SingleVariableReturnMappingSolution::_relative_tolerance

privateinherited

Relative convergence tolerance.

Definition at line 152 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::converged(), and SingleVariableReturnMappingSolution::outputIterationStep().

◆ _residual

Real SingleVariableReturnMappingSolution::_residual

privateinherited

Definition at line 171 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::internalSolve(), and SingleVariableReturnMappingSolution::outputIterationSummary().

◆ _residual_history

std::vector<Real> SingleVariableReturnMappingSolution::_residual_history

privateinherited

History of residuals used to check whether progress is still being made on decreasing the residual.

Definition at line 164 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::convergedAcceptable(), and SingleVariableReturnMappingSolution::internalSolve().

◆ _shear_modulus

Real PowerLawCreepModel::_shear_modulus

protected

Definition at line 39 of file PowerLawCreepModel.h.

Referenced by computeDerivative(), computeResidual(), and computeStressInitialize().

◆ _start_time

const Real PowerLawCreepModel::_start_time

protected

Definition at line 37 of file PowerLawCreepModel.h.

Referenced by computeStressInitialize().

◆ _step_one_cm

bool& ConstitutiveModel::_step_one_cm

protectedinherited

Definition at line 61 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain().

◆ _step_zero_cm

bool& ConstitutiveModel::_step_zero_cm

protectedinherited

Restartable data to check for the zeroth and first time steps.

Definition at line 60 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain().

◆ _stress_free_temp

Real ConstitutiveModel::_stress_free_temp

protectedinherited

Definition at line 55 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain().

◆ _svrms_name

const std::string SingleVariableReturnMappingSolution::_svrms_name

privateinherited

MOOSE input name of the object performing the solve.

Definition at line 175 of file SingleVariableReturnMappingSolution.h.

Referenced by SingleVariableReturnMappingSolution::outputIterationSummary().

◆ _temperature

const VariableValue& ConstitutiveModel::_temperature

protectedinherited

Definition at line 50 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain(), CombinedCreepPlasticity::computeStress(), computeStressInitialize(), IsotropicTempDepHardening::computeYieldStress(), IsotropicPlasticity::computeYieldStress(), and IsotropicTempDepHardening::initializeHardeningFunctions().

◆ _temperature_old

const VariableValue& ConstitutiveModel::_temperature_old

protectedinherited

Definition at line 51 of file ConstitutiveModel.h.

Referenced by ConstitutiveModel::applyThermalStrain().

◆ _three_shear_modulus

Real ReturnMappingModel::_three_shear_modulus

protectedinherited

3 * shear modulus

Definition at line 95 of file ReturnMappingModel.h.

Referenced by ReturnMappingModel::computeReferenceResidual(), and ReturnMappingModel::computeStress().

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

solid_mechanics/include/materials/PowerLawCreepModel.h
solid_mechanics/src/materials/PowerLawCreepModel.C

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Private Types

Private Member Functions

Private Attributes

Detailed Description

Member Enumeration Documentation

◆ InternalSolveOutput

◆ SolveState

Constructor & Destructor Documentation

◆ PowerLawCreepModel()

Member Function Documentation

◆ applyThermalStrain()

◆ checkPermissibleRange()

◆ computeDerivative()

◆ computeReferenceResidual()

◆ computeResidual()

◆ computeStress() [1/2]

◆ computeStress() [2/2]

◆ computeStressFinalize()

◆ computeStressInitialize()

◆ computeTimeStepLimit()

◆ converged()

◆ convergedAcceptable()

◆ initialGuess()

◆ initQpStatefulProperties()

◆ internalSolve()

◆ iterationFinalize()

◆ maximumPermissibleValue()

◆ minimumPermissibleValue()

◆ modifyStrainIncrement()

◆ outputIterationStep()

◆ outputIterationSummary()

◆ returnMappingSolve()

◆ setQp()

◆ updateBounds()

◆ updateElasticityTensor()

◆ validParams()

Member Data Documentation

◆ _absolute_tolerance

◆ _acceptable_multiplier

◆ _activation_energy

◆ _alpha

◆ _alpha_function

◆ _bracket_solution

◆ _check_range

◆ _coefficient

◆ _compute_matl_timestep_limit

◆ _creep_strain

◆ _creep_strain_old

◆ _effective_inelastic_strain

◆ _effective_inelastic_strain_old

◆ _effective_strain_increment

◆ _exponential

◆ _expTime

◆ _gas_constant

◆ _has_stress_free_temp

◆ _has_temp

◆ _initial_residual

◆ _internal_solve_full_iteration_history

◆ _internal_solve_output_on

◆ _iteration

◆ _line_search

◆ _m_exponent

◆ _matl_timestep_limit

◆ _max_inelastic_increment

◆ _max_its

◆ _mean_alpha_function

◆ _n_exponent

◆ _num_resids

◆ _ref_temp

◆ _relative_tolerance

◆ _residual

◆ _residual_history

◆ _shear_modulus

◆ _start_time

◆ _step_one_cm

◆ _step_zero_cm