ElasticStrain.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/ElasticStrain.h"
#include "neml2/tensors/SSR4.h"
 
namespace neml2
{
register_NEML2_object(ElasticStrain);
 
OptionSet
ElasticStrain::expected_options()
{
  OptionSet options = Model::expected_options();
  options.doc() = "Calculate elastic strain given total and plastic strain (assuming additive "
                  "decomposition), i.e. \\f$ \\boldsymbol{\\varepsilon}_e = "
                  "\\boldsymbol{\\varepsilon} - \\boldsymbol{\\varepsilon}_p \\f$.";
 
  options.set<VariableName>("total_strain") = VariableName("forces", "E");
  options.set("total_strain").doc() = "Total strain";
 
  options.set<VariableName>("plastic_strain") = VariableName("state", "internal", "Ep");
  options.set("plastic_strain").doc() = "Plastic strain";
 
  options.set<VariableName>("elastic_strain") = VariableName("state", "internal", "Ee");
  options.set("elastic_strain").doc() = "Elastic strain";
 
  options.set<bool>("rate_form") = false;
  options.set("rate_form").doc() = "Whether the model defines the relationship in rate form";
 
  return options;
}
 
ElasticStrain::ElasticStrain(const OptionSet & options)
  : Model(options),
    _rate_form(options.get<bool>("rate_form")),
    _E(declare_input_variable<SR2>(
        options.get<VariableName>("total_strain").with_suffix(_rate_form ? "_rate" : ""))),
    _Ep(declare_input_variable<SR2>(
        options.get<VariableName>("plastic_strain").with_suffix(_rate_form ? "_rate" : ""))),
    _Ee(declare_output_variable<SR2>(
        options.get<VariableName>("elastic_strain").with_suffix(_rate_form ? "_rate" : "")))
{
}
 
void
ElasticStrain::set_value(bool out, bool dout_din, bool d2out_din2)
{
  if (out)
    _Ee = _E - _Ep;
 
  if (dout_din)
  {
    auto I = SR2::identity_map(options());
    _Ee.d(_E) = I;
    _Ee.d(_Ep) = -I;
  }
 
  if (d2out_din2)
  {
    // zero
  }
}
} // namespace neml2