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/phase_field_fracture/PowerDegradationFunction.h"
      26              : #include "neml2/tensors/functions/pow.h"
      27              : #include "neml2/tensors/Scalar.h"
      28              : 
      29              : namespace neml2
      30              : {
      31              : register_NEML2_object(PowerDegradationFunction);
      32              : 
      33              : OptionSet
      34            2 : PowerDegradationFunction::expected_options()
      35              : {
      36            2 :   OptionSet options = DegradationFunction::expected_options();
      37            2 :   options.doc() = "Power degradation function to degrade the elastic strain energy density, \\f$ g "
      38            2 :                   "= \\left( 1-d \\right)^2 (1-\\eta) + \\eta \\f$";
      39            4 :   options.set<TensorName<Scalar>>("power");
      40            4 :   options.set("power").doc() = "Power of the degradation function";
      41            4 :   options.set<double>("eta") = 0;
      42            4 :   options.set("eta").doc() = "Residual degradation when d = 1";
      43              : 
      44            2 :   options.set<bool>("define_second_derivatives") = true;
      45              : 
      46            2 :   return options;
      47            0 : }
      48              : 
      49            1 : PowerDegradationFunction::PowerDegradationFunction(const OptionSet & options)
      50              :   : DegradationFunction(options),
      51            4 :     _p(declare_parameter<Scalar>("p", "power")),
      52            2 :     _eta(options.get<double>("eta"))
      53              : {
      54            1 : }
      55              : 
      56              : void
      57            3 : PowerDegradationFunction::set_value(bool out, bool dout_din, bool d2out_din2)
      58              : {
      59            3 :   if (out)
      60              :   {
      61            1 :     _g = pow((1 - _d), _p) * (1 - _eta) + _eta;
      62              :   }
      63              : 
      64            3 :   if (dout_din)
      65              :   {
      66            1 :     _g.d(_d) = -_p * pow((1 - _d), (_p - 1)) * (1 - _eta);
      67              :   }
      68              : 
      69            3 :   if (d2out_din2)
      70              :   {
      71            1 :     _g.d(_d, _d) = (_p * (_p - 1)) * pow((1 - _d), (_p - 2)) * (1 - _eta);
      72              :   }
      73            3 : }
      74              : } // namespace neml2