IsotropicMandelStress.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/IsotropicMandelStress.h"
#include "neml2/tensors/SSR4.h"
 
namespace neml2
{
register_NEML2_object(IsotropicMandelStress);
 
OptionSet
IsotropicMandelStress::expected_options()
{
  OptionSet options = MandelStress::expected_options();
  options.doc() += " For isotropic material under small deformation, the Mandel stress and the "
                   "Cauchy stress coincide.";
 
  return options;
}
 
void
IsotropicMandelStress::set_value(bool out, bool dout_din, bool d2out_din2)
{
  // Isotropic mandel stress is just the Cauchy stress
 
  if (out)
    _M = SR2(_S);
 
  if (dout_din)
    _M.d(_S) = SR2::identity_map(options());
 
  if (d2out_din2)
  {
    // zero
  }
}
} // namespace neml2