Calculates The Deformation Energy associated with a specific dislocation density. More...

#include <DeformedGrainMaterial.h>

Inheritance diagram for DeformedGrainMaterial:

Public Member Functions
	DeformedGrainMaterial (const InputParameters &parameters)

Protected Member Functions
virtual void	computeQpProperties ()

Protected Attributes
const unsigned int	_op_num
	total number of grains More...

std::vector< const VariableValue * >	_vals
	order parameter values More...

const Real	_length_scale

const Real	_int_width

const Real	_time_scale

const Real	_GBMobility

const Real	_GBE
	the GB Energy More...

const Real	_Disloc_Den
	the average dislocation density More...

const Real	_Elas_Mod
	the elastic modulus More...

const Real	_Burg_vec
	the Length of Burger's Vector More...

MaterialProperty< Real > &	_kappa
	the same parameters that appear in the original grain growth model More...

MaterialProperty< Real > &	_gamma

MaterialProperty< Real > &	_L

MaterialProperty< Real > &	_mu

MaterialProperty< Real > &	_beta
	the prefactor needed to calculate the deformation energy from dislocation density More...

MaterialProperty< Real > &	_Disloc_Den_i
	dislocation density in grain i More...

MaterialProperty< Real > &	_rho_eff
	the average/effective dislocation density More...

MaterialProperty< Real > &	_Def_Eng
	the deformation energy More...

const unsigned int	_deformed_grain_num
	number of deformed grains More...

const GrainTrackerInterface &	_grain_tracker
	Grain tracker object. More...

const Real	_kb

const Real	_JtoeV

Detailed Description

Calculates The Deformation Energy associated with a specific dislocation density.

The rest of parameters are the same as in the grain growth model

Definition at line 25 of file DeformedGrainMaterial.h.

Constructor & Destructor Documentation

◆ DeformedGrainMaterial()

DeformedGrainMaterial::DeformedGrainMaterial ( const InputParameters & parameters )

Definition at line 37 of file DeformedGrainMaterial.C.

   : Material(parameters),
     _op_num(coupledComponents("v")),
     _vals(_op_num),
     _length_scale(getParam<Real>("length_scale")),
     _int_width(getParam<Real>("int_width")),
     _time_scale(getParam<Real>("time_scale")),
     _GBMobility(getParam<Real>("GBMobility")),
     _GBE(getParam<Real>("GBE")),
     _Disloc_Den(getParam<Real>("Disloc_Den")),
     _Elas_Mod(getParam<Real>("Elas_Mod")),
     _Burg_vec(getParam<Real>("Burg_vec")),
     _kappa(declareProperty<Real>("kappa_op")),
     _gamma(declareProperty<Real>("gamma_asymm")),
     _L(declareProperty<Real>("L")),
     _mu(declareProperty<Real>("mu")),
     _beta(declareProperty<Real>("beta")),
     _Disloc_Den_i(declareProperty<Real>("Disloc_Den_i")),
     _rho_eff(declareProperty<Real>("rho_eff")),
     _Def_Eng(declareProperty<Real>("Def_Eng")),
     _deformed_grain_num(getParam<unsigned int>("deformed_grain_num")),
     _grain_tracker(getUserObject<GrainTrackerInterface>("grain_tracker")),
     _kb(8.617343e-5),     // Boltzmann constant in eV/K
     _JtoeV(6.24150974e18) // Joule to eV conversion
 {
   if (_op_num == 0)
     paramError("op_num", "Model requires op_num > 0");
  
   for (unsigned int i = 0; i < _op_num; ++i)
     _vals[i] = &coupledValue("v", i);
 }

Member Function Documentation

◆ computeQpProperties()

void DeformedGrainMaterial::computeQpProperties ( )

protectedvirtual

Definition at line 70 of file DeformedGrainMaterial.C.

 {
   _Disloc_Den_i[_qp] = _Disloc_Den * (_length_scale * _length_scale);
  
   Real rho_i;
   Real rho0 = 0.0;
   Real SumEtai2 = 0.0;
   for (unsigned int i = 0; i < _op_num; ++i)
     SumEtai2 += (*_vals[i])[_qp] * (*_vals[i])[_qp];
  
   // calculate effective dislocation density and assign zero dislocation densities to undeformed
   // grains
   const auto & op_to_grains = _grain_tracker.getVarToFeatureVector(_current_elem->id());
  
   // loop over active OPs
   bool one_active = false;
   for (MooseIndex(op_to_grains) op_index = 0; op_index < op_to_grains.size(); ++op_index)
   {
     if (op_to_grains[op_index] == FeatureFloodCount::invalid_id)
       continue;
  
     one_active = true;
     auto grain_id = op_to_grains[op_index];
  
     if (grain_id >= _deformed_grain_num)
       rho_i = 0.0;
     else
       rho_i = _Disloc_Den_i[_qp];
     rho0 += rho_i * (*_vals[op_index])[_qp] * (*_vals[op_index])[_qp];
   }
  
   if (!one_active && _t_step > 0)
     mooseError("No active order parameters");
  
   _rho_eff[_qp] = rho0 / SumEtai2;
   if (_rho_eff[_qp] < 1e-9)
   {
     _rho_eff[_qp] = 0.0;
     _Disloc_Den_i[_qp] = 0.0;
   }
  
   _beta[_qp] = 0.5 * _Elas_Mod * _Burg_vec * _Burg_vec * _JtoeV * _length_scale;
  
   // Compute the deformation energy
   _Def_Eng[_qp] = _beta[_qp] * _rho_eff[_qp];
  
   const Real sigma = _GBE * _JtoeV * (_length_scale * _length_scale);
   const Real length_scale4 = _length_scale * _length_scale * _length_scale * _length_scale;
   const Real M_GB = _GBMobility * _time_scale / (_JtoeV * length_scale4);
  
   _L[_qp] = 4.0 / 3.0 * M_GB / _int_width;
   _kappa[_qp] = 3.0 / 4.0 * sigma * _int_width;
   _gamma[_qp] = 1.5;
   _mu[_qp] = 6.0 * sigma / _int_width;
 }

Member Data Documentation

◆ _beta

MaterialProperty<Real>& DeformedGrainMaterial::_beta

protected

the prefactor needed to calculate the deformation energy from dislocation density

Definition at line 63 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _Burg_vec

const Real DeformedGrainMaterial::_Burg_vec

protected

the Length of Burger's Vector

Definition at line 54 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _Def_Eng

MaterialProperty<Real>& DeformedGrainMaterial::_Def_Eng

protected

the deformation energy

Definition at line 72 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _deformed_grain_num

const unsigned int DeformedGrainMaterial::_deformed_grain_num

protected

number of deformed grains

Definition at line 77 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _Disloc_Den

const Real DeformedGrainMaterial::_Disloc_Den

protected

the average dislocation density

Definition at line 48 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _Disloc_Den_i

MaterialProperty<Real>& DeformedGrainMaterial::_Disloc_Den_i

protected

dislocation density in grain i

Definition at line 66 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _Elas_Mod

const Real DeformedGrainMaterial::_Elas_Mod

protected

the elastic modulus

Definition at line 51 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _gamma

MaterialProperty<Real>& DeformedGrainMaterial::_gamma

protected

Definition at line 58 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _GBE

const Real DeformedGrainMaterial::_GBE

protected

the GB Energy

Definition at line 45 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _GBMobility

const Real DeformedGrainMaterial::_GBMobility

protected

Definition at line 42 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _grain_tracker

const GrainTrackerInterface& DeformedGrainMaterial::_grain_tracker

protected

Grain tracker object.

Definition at line 80 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _int_width

const Real DeformedGrainMaterial::_int_width

protected

Definition at line 40 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _JtoeV

const Real DeformedGrainMaterial::_JtoeV

protected

Definition at line 82 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _kappa

MaterialProperty<Real>& DeformedGrainMaterial::_kappa

protected

the same parameters that appear in the original grain growth model

Definition at line 57 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _kb

const Real DeformedGrainMaterial::_kb

protected

Definition at line 81 of file DeformedGrainMaterial.h.

◆ _L

MaterialProperty<Real>& DeformedGrainMaterial::_L

protected

Definition at line 59 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _length_scale

const Real DeformedGrainMaterial::_length_scale

protected

Definition at line 39 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _mu

MaterialProperty<Real>& DeformedGrainMaterial::_mu

protected

Definition at line 60 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _op_num

const unsigned int DeformedGrainMaterial::_op_num

protected

total number of grains

Definition at line 34 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties(), and DeformedGrainMaterial().

◆ _rho_eff

MaterialProperty<Real>& DeformedGrainMaterial::_rho_eff

protected

the average/effective dislocation density

Definition at line 69 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _time_scale

const Real DeformedGrainMaterial::_time_scale

protected

Definition at line 41 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties().

◆ _vals

std::vector<const VariableValue *> DeformedGrainMaterial::_vals

protected

order parameter values

Definition at line 37 of file DeformedGrainMaterial.h.

Referenced by computeQpProperties(), and DeformedGrainMaterial().

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

phase_field/include/materials/DeformedGrainMaterial.h
phase_field/src/materials/DeformedGrainMaterial.C

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ DeformedGrainMaterial()

Member Function Documentation

◆ computeQpProperties()

Member Data Documentation

◆ _beta

◆ _Burg_vec

◆ _Def_Eng

◆ _deformed_grain_num

◆ _Disloc_Den

◆ _Disloc_Den_i

◆ _Elas_Mod

◆ _gamma

◆ _GBE

◆ _GBMobility

◆ _grain_tracker

◆ _int_width

◆ _JtoeV

◆ _kappa

◆ _kb

◆ _L

◆ _length_scale

◆ _mu

◆ _op_num

◆ _rho_eff

◆ _time_scale

◆ _vals