SolidMechanicsPlasticModel.C

Go to the documentation of this file.

//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html
 
//  Plastic Model base class.
//
#include "SolidMechanicsPlasticModel.h"
#include "RankFourTensor.h"
 
InputParameters
SolidMechanicsPlasticModel::validParams()
{
  InputParameters params = GeneralUserObject::validParams();
  params.addRequiredRangeCheckedParam<Real>("yield_function_tolerance",
                                            "yield_function_tolerance>0",
                                            "If the yield function is less than this amount, the "
                                            "(stress, internal parameter) are deemed admissible.");
  params.addRequiredRangeCheckedParam<Real>("internal_constraint_tolerance",
                                            "internal_constraint_tolerance>0",
                                            "The Newton-Raphson process is only deemed converged "
                                            "if the internal constraint is less than this.");
  params.addClassDescription(
      "Plastic Model base class.  Override the virtual functions in your class");
  return params;
}
 
SolidMechanicsPlasticModel::SolidMechanicsPlasticModel(const InputParameters & parameters)
  : GeneralUserObject(parameters),
    _f_tol(getParam<Real>("yield_function_tolerance")),
    _ic_tol(getParam<Real>("internal_constraint_tolerance"))
{
}
 
void
SolidMechanicsPlasticModel::initialize()
{
}
 
void
SolidMechanicsPlasticModel::execute()
{
}
 
void
SolidMechanicsPlasticModel::finalize()
{
}
 
unsigned
SolidMechanicsPlasticModel::numberSurfaces() const
{
  return 1;
}
 
Real
SolidMechanicsPlasticModel::yieldFunction(const RankTwoTensor & /*stress*/, Real /*intnl*/) const
{
  return 0.0;
}
 
void
SolidMechanicsPlasticModel::yieldFunctionV(const RankTwoTensor & stress,
                                           Real intnl,
                                           std::vector<Real> & f) const
{
  f.assign(1, yieldFunction(stress, intnl));
}
 
RankTwoTensor
SolidMechanicsPlasticModel::dyieldFunction_dstress(const RankTwoTensor & /*stress*/,
                                                   Real /*intnl*/) const
{
  return RankTwoTensor();
}
 
void
SolidMechanicsPlasticModel::dyieldFunction_dstressV(const RankTwoTensor & stress,
                                                    Real intnl,
                                                    std::vector<RankTwoTensor> & df_dstress) const
{
  df_dstress.assign(1, dyieldFunction_dstress(stress, intnl));
}
 
Real
SolidMechanicsPlasticModel::dyieldFunction_dintnl(const RankTwoTensor & /*stress*/,
                                                  Real /*intnl*/) const
{
  return 0.0;
}
void
SolidMechanicsPlasticModel::dyieldFunction_dintnlV(const RankTwoTensor & stress,
                                                   Real intnl,
                                                   std::vector<Real> & df_dintnl) const
{
  return df_dintnl.assign(1, dyieldFunction_dintnl(stress, intnl));
}
 
RankTwoTensor
SolidMechanicsPlasticModel::flowPotential(const RankTwoTensor & /*stress*/, Real /*intnl*/) const
{
  return RankTwoTensor();
}
void
SolidMechanicsPlasticModel::flowPotentialV(const RankTwoTensor & stress,
                                           Real intnl,
                                           std::vector<RankTwoTensor> & r) const
{
  return r.assign(1, flowPotential(stress, intnl));
}
 
RankFourTensor
SolidMechanicsPlasticModel::dflowPotential_dstress(const RankTwoTensor & /*stress*/,
                                                   Real /*intnl*/) const
{
  return RankFourTensor();
}
void
SolidMechanicsPlasticModel::dflowPotential_dstressV(const RankTwoTensor & stress,
                                                    Real intnl,
                                                    std::vector<RankFourTensor> & dr_dstress) const
{
  return dr_dstress.assign(1, dflowPotential_dstress(stress, intnl));
}
 
RankTwoTensor
SolidMechanicsPlasticModel::dflowPotential_dintnl(const RankTwoTensor & /*stress*/,
                                                  Real /*intnl*/) const
{
  return RankTwoTensor();
}
void
SolidMechanicsPlasticModel::dflowPotential_dintnlV(const RankTwoTensor & stress,
                                                   Real intnl,
                                                   std::vector<RankTwoTensor> & dr_dintnl) const
{
  return dr_dintnl.assign(1, dflowPotential_dintnl(stress, intnl));
}
 
Real
SolidMechanicsPlasticModel::hardPotential(const RankTwoTensor & /*stress*/, Real /*intnl*/) const
{
  return -1.0;
}
void
SolidMechanicsPlasticModel::hardPotentialV(const RankTwoTensor & stress,
                                           Real intnl,
                                           std::vector<Real> & h) const
{
  h.assign(numberSurfaces(), hardPotential(stress, intnl));
}
 
RankTwoTensor
SolidMechanicsPlasticModel::dhardPotential_dstress(const RankTwoTensor & /*stress*/,
                                                   Real /*intnl*/) const
{
  return RankTwoTensor();
}
void
SolidMechanicsPlasticModel::dhardPotential_dstressV(const RankTwoTensor & stress,
                                                    Real intnl,
                                                    std::vector<RankTwoTensor> & dh_dstress) const
{
  dh_dstress.assign(numberSurfaces(), dhardPotential_dstress(stress, intnl));
}
 
Real
SolidMechanicsPlasticModel::dhardPotential_dintnl(const RankTwoTensor & /*stress*/,
                                                  Real /*intnl*/) const
{
  return 0.0;
}
void
SolidMechanicsPlasticModel::dhardPotential_dintnlV(const RankTwoTensor & stress,
                                                   Real intnl,
                                                   std::vector<Real> & dh_dintnl) const
{
  dh_dintnl.resize(numberSurfaces(), dhardPotential_dintnl(stress, intnl));
}
 
void
SolidMechanicsPlasticModel::activeConstraints(const std::vector<Real> & f,
                                              const RankTwoTensor & /*stress*/,
                                              Real /*intnl*/,
                                              const RankFourTensor & /*Eijkl*/,
                                              std::vector<bool> & act,
                                              RankTwoTensor & /*returned_stress*/) const
{
  mooseAssert(f.size() == numberSurfaces(),
              "f incorrectly sized at " << f.size() << " in activeConstraints");
  act.resize(numberSurfaces());
  for (unsigned surface = 0; surface < numberSurfaces(); ++surface)
    act[surface] = (f[surface] > _f_tol);
}
 
std::string
SolidMechanicsPlasticModel::modelName() const
{
  return "None";
}
 
bool
SolidMechanicsPlasticModel::useCustomReturnMap() const
{
  return false;
}
 
bool
SolidMechanicsPlasticModel::useCustomCTO() const
{
  return false;
}
 
bool
SolidMechanicsPlasticModel::returnMap(const RankTwoTensor & trial_stress,
                                      Real intnl_old,
                                      const RankFourTensor & /*E_ijkl*/,
                                      Real /*ep_plastic_tolerance*/,
                                      RankTwoTensor & /*returned_stress*/,
                                      Real & /*returned_intnl*/,
                                      std::vector<Real> & /*dpm*/,
                                      RankTwoTensor & /*delta_dp*/,
                                      std::vector<Real> & yf,
                                      bool & trial_stress_inadmissible) const
{
  trial_stress_inadmissible = false;
  yieldFunctionV(trial_stress, intnl_old, yf);
 
  for (unsigned sf = 0; sf < numberSurfaces(); ++sf)
    if (yf[sf] > _f_tol)
      trial_stress_inadmissible = true;
 
  // example of checking Kuhn-Tucker
  std::vector<Real> dpm(numberSurfaces(), 0);
  for (unsigned sf = 0; sf < numberSurfaces(); ++sf)
    if (!KuhnTuckerSingleSurface(yf[sf], dpm[sf], 0))
      return false;
  return true;
}
 
bool
SolidMechanicsPlasticModel::KuhnTuckerSingleSurface(Real yf, Real dpm, Real dpm_tol) const
{
  return (dpm == 0 && yf <= _f_tol) || (dpm > -dpm_tol && yf <= _f_tol && yf >= -_f_tol);
}
 
RankFourTensor
SolidMechanicsPlasticModel::consistentTangentOperator(
    const RankTwoTensor & /*trial_stress*/,
    Real /*intnl_old*/,
    const RankTwoTensor & /*stress*/,
    Real /*intnl*/,
    const RankFourTensor & E_ijkl,
    const std::vector<Real> & /*cumulative_pm*/) const
{
  return E_ijkl;
}