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/AssociativeJ2FlowDirection.h"
      26              : #include "neml2/tensors/Scalar.h"
      27              : #include "neml2/tensors/SR2.h"
      28              : #include "neml2/tensors/SSR4.h"
      29              : 
      30              : namespace neml2
      31              : {
      32              : register_NEML2_object(AssociativeJ2FlowDirection);
      33              : 
      34              : OptionSet
      35            2 : AssociativeJ2FlowDirection::expected_options()
      36              : {
      37            2 :   auto options = Model::expected_options();
      38            2 :   options.doc() = "The plastic flow direction assuming an associative J2 flow.";
      39              : 
      40            6 :   options.set<VariableName>("mandel_stress") = VariableName(STATE, "M");
      41            2 :   options.set("mandel_stress").doc() = "Mandel stress";
      42              : 
      43            6 :   options.set<VariableName>("flow_direction") = VariableName(STATE, "NM");
      44            2 :   options.set("flow_direction").doc() = "Flow direction";
      45              : 
      46            2 :   return options;
      47            0 : }
      48              : 
      49            1 : AssociativeJ2FlowDirection::AssociativeJ2FlowDirection(const OptionSet & options)
      50              :   : Model(options),
      51            1 :     _M(declare_input_variable<SR2>("mandel_stress")),
      52            2 :     _N(declare_output_variable<SR2>("flow_direction"))
      53              : {
      54            1 : }
      55              : 
      56              : void
      57            2 : AssociativeJ2FlowDirection::set_value(bool out, bool dout_din, bool /*d2out_din2*/)
      58              : {
      59            2 :   auto eps = machine_precision(_M.scalar_type());
      60            2 :   auto S = SR2(_M).dev();
      61            2 :   auto vm = std::sqrt(3.0 / 2.0) * S.norm(eps);
      62            2 :   auto dvm_dM = 3.0 / 2.0 * S / vm;
      63              : 
      64            2 :   if (out)
      65              :   {
      66            1 :     _N = dvm_dM;
      67              :   }
      68              : 
      69            2 :   if (dout_din)
      70            1 :     if (_M.is_dependent())
      71              :     {
      72            1 :       auto I = SSR4::identity_sym(_M.options());
      73            1 :       auto J = SSR4::identity_dev(_M.options());
      74              : 
      75            1 :       _N.d(_M) = 3.0 / 2.0 * (I - 2.0 / 3.0 * dvm_dM.outer(dvm_dM)) * J / vm;
      76            1 :     }
      77            2 : }
      78              : } // namespace neml2