PlasticDeformationRate.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/crystal_plasticity/PlasticDeformationRate.h"
#include "neml2/models/crystallography/CrystalGeometry.h"
 
#include "neml2/tensors/tensors.h"
#include "neml2/tensors/list_tensors.h"
 
namespace neml2
{
register_NEML2_object(PlasticDeformationRate);
 
OptionSet
PlasticDeformationRate::expected_options()
{
  OptionSet options = Model::expected_options();
 
  options.doc() = "Caclulates the plastic deformation rate as \\f$ d^p = \\sum_{i=1}^{n_{slip}} "
                  "\\dot{\\gamma}_i Q \\operatorname{sym}{\\left(d_i \\otimes n_i \\right)} Q^T "
                  "\\f$ with \\f$ d^p \\f$ the plastic deformation rate, \\f$ \\dot{\\gamma}_i "
                  "\\f$ the slip rate on the ith slip system, \\f$Q \\f$ the orientation, \\f$ d_i "
                  "\\f$ the slip system direction, and \\f$ n_i \\f$ the slip system normal.";
 
  options.set<VariableName>("plastic_deformation_rate") =
      VariableName("state", "internal", "plastic_deformation_rate");
  options.set("plastic_deformation_rate").doc() = "The name of the plastic deformation rate tensor";
 
  options.set<VariableName>("orientation") = VariableName("state", "orientation_matrix");
  options.set("orientation").doc() = "The name of the orientation matrix tensor";
 
  options.set<VariableName>("slip_rates") = VariableName("state", "internal", "slip_rates");
  options.set("slip_rates").doc() = "The name of the tensor containg the current slip rates";
 
  options.set<std::string>("crystal_geometry_name") = "crystal_geometry";
  options.set("crystal_geometry_name").doc() =
      "The name of the Data object containing the crystallographic information for the material";
 
  return options;
}
 
PlasticDeformationRate::PlasticDeformationRate(const OptionSet & options)
  : Model(options),
    _crystal_geometry(register_data<crystallography::CrystalGeometry>(
        options.get<std::string>("crystal_geometry_name"))),
    _dp(declare_output_variable<SR2>("plastic_deformation_rate")),
    _R(declare_input_variable<R2>("orientation")),
    _g(declare_input_variable_list<Scalar>(_crystal_geometry.nslip(), "slip_rates"))
{
}
 
void
PlasticDeformationRate::set_value(bool out, bool dout_din, bool d2out_din2)
{
  neml_assert_dbg(!d2out_din2, "Second derivative not implemented.");
 
  // Grab the input
  const auto g = Scalar(_g, batch_dim() + 1);
  const auto dp_crystal = (g * _crystal_geometry.M()).list_sum();
 
  if (out)
    _dp = dp_crystal.rotate(R2(_R));
 
  if (dout_din)
  {
    _dp.d(_g) = BatchTensor(_crystal_geometry.M().rotate(R2(_R).batch_unsqueeze(-1)), batch_dim())
                    .base_transpose(-2, -1);
    _dp.d(_R) = dp_crystal.drotate(R2(_R));
  }
}
} // namespace neml2