Line data    Source code

       1              : // Copyright 2024, UChicago Argonne, LLC
       2              : // All Rights Reserved
       3              : // Software Name: NEML2 -- the New Engineering material Model Library, version 2
       4              : // By: Argonne National Laboratory
       5              : // OPEN SOURCE LICENSE (MIT)
       6              : //
       7              : // Permission is hereby granted, free of charge, to any person obtaining a copy
       8              : // of this software and associated documentation files (the "Software"), to deal
       9              : // in the Software without restriction, including without limitation the rights
      10              : // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      11              : // copies of the Software, and to permit persons to whom the Software is
      12              : // furnished to do so, subject to the following conditions:
      13              : //
      14              : // The above copyright notice and this permission notice shall be included in
      15              : // all copies or substantial portions of the Software.
      16              : //
      17              : // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      18              : // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      19              : // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      20              : // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      21              : // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      22              : // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
      23              : // THE SOFTWARE.
      24              : 
      25              : #include "neml2/models/solid_mechanics/VoceIsotropicHardening.h"
      26              : #include "neml2/tensors/Scalar.h"
      27              : #include "neml2/tensors/functions/exp.h"
      28              : 
      29              : namespace neml2
      30              : {
      31              : register_NEML2_object(VoceIsotropicHardening);
      32              : 
      33              : OptionSet
      34            2 : VoceIsotropicHardening::expected_options()
      35              : {
      36            2 :   OptionSet options = IsotropicHardening::expected_options();
      37            2 :   options.doc() = "Voce isotropic hardening model, \\f$ h = R \\left[ 1 - \\exp(-d \\varepsilon_p) "
      38              :                   "\\right] \\f$, where \\f$ R \\f$ is the isotropic hardening upon saturation, "
      39            2 :                   "and \\f$ d \\f$ is the hardening rate.";
      40              : 
      41            4 :   options.set<bool>("define_second_derivatives") = true;
      42              : 
      43            4 :   options.set_parameter<TensorName<Scalar>>("saturated_hardening");
      44            4 :   options.set("saturated_hardening").doc() = "Saturated isotropic hardening";
      45            4 :   options.set_parameter<TensorName<Scalar>>("saturation_rate");
      46            2 :   options.set("saturation_rate").doc() = "Hardening saturation rate";
      47              : 
      48            2 :   return options;
      49            0 : }
      50              : 
      51            3 : VoceIsotropicHardening::VoceIsotropicHardening(const OptionSet & options)
      52              :   : IsotropicHardening(options),
      53            9 :     _R(declare_parameter<Scalar>("R", "saturated_hardening", true)),
      54           15 :     _d(declare_parameter<Scalar>("d", "saturation_rate", true))
      55              : {
      56            3 : }
      57              : 
      58              : void
      59            7 : VoceIsotropicHardening::set_value(bool out, bool dout_din, bool d2out_din2)
      60              : {
      61            7 :   if (out)
      62            5 :     _h = _R * (-exp(-_d * _ep) + 1.0);
      63              : 
      64            7 :   if (dout_din)
      65              :   {
      66            3 :     if (_ep.is_dependent())
      67            3 :       _h.d(_ep) = _R * _d * exp(-_d * _ep);
      68              : 
      69            9 :     if (const auto * const R = nl_param("R"))
      70            1 :       _h.d(*R) = -exp(-_d * _ep) + 1.0;
      71              : 
      72            9 :     if (const auto * const d = nl_param("d"))
      73            1 :       _h.d(*d) = _ep * _R * exp(-_d * _ep);
      74              :   }
      75              : 
      76            7 :   if (d2out_din2)
      77            1 :     if (_ep.is_dependent())
      78            1 :       _h.d(_ep, _ep) = -_R * _d * _d * exp(-_d * _ep);
      79            7 : }
      80              : } // namespace neml2