GursonCavitation.cxx

// Copyright 2023, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
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#include "neml2/models/solid_mechanics/GursonCavitation.h"
#include "neml2/tensors/SSR4.h"
 
namespace neml2
{
register_NEML2_object(GursonCavitation);
 
OptionSet
GursonCavitation::expected_options()
{
  OptionSet options = Model::expected_options();
  options.doc() = "Local mass balance used in conjunction with the GTNYieldFunction, \\f$ "
                  "\\dot{\\phi} = (1-\\phi) \\dot{\\varepsilon}_p \\f$.";
 
  options.set<VariableName>("plastic_strain_rate") = VariableName("state", "internal", "Ep_rate");
  options.set("plastic_strain_rate").doc() = "Plastic strain rate";
 
  options.set<VariableName>("void_fraction") = VariableName("state", "internal", "f");
  options.set("void_fraction").doc() = "Void fraction (porosity)";
 
  options.set<VariableName>("void_fraction_rate") = VariableName("state", "internal", "f_rate");
  options.set("void_fraction_rate").doc() = "Rate of void evolution";
 
  return options;
}
 
GursonCavitation::GursonCavitation(const OptionSet & options)
  : Model(options),
    _phi_dot(declare_output_variable<Scalar>("void_fraction_rate")),
    _Ep_dot(declare_input_variable<SR2>("plastic_strain_rate")),
    _phi(declare_input_variable<Scalar>("void_fraction"))
{
}
 
void
GursonCavitation::set_value(bool out, bool dout_din, bool d2out_din2)
{
  const auto ep_dot = SR2(_Ep_dot).tr();
 
  if (out)
    _phi_dot = (1 - _phi) * ep_dot;
 
  if (dout_din || d2out_din2)
  {
    const auto I = SR2::identity(options());
 
    if (dout_din)
    {
      _phi_dot.d(_phi) = -ep_dot;
      _phi_dot.d(_Ep_dot) = I * (1 - _phi);
    }
 
    // No idea if this will ever be used, but why not as it's easy?
    if (d2out_din2)
    {
      _phi_dot.d(_phi, _Ep_dot) = -I;
      _phi_dot.d(_Ep_dot, _phi) = -I;
    }
  }
}
} // namespace neml2