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/crystal_plasticity/PowerLawSlipRule.h"
      26              : #include "neml2/models/solid_mechanics/crystal_plasticity/SlipRule.h"
      27              : #include "neml2/tensors/Scalar.h"
      28              : #include "neml2/tensors/functions/pow.h"
      29              : #include "neml2/tensors/functions/abs.h"
      30              : #include "neml2/tensors/functions/diag_embed.h"
      31              : 
      32              : namespace neml2
      33              : {
      34              : register_NEML2_object(PowerLawSlipRule);
      35              : 
      36              : OptionSet
      37            2 : PowerLawSlipRule::expected_options()
      38              : {
      39            2 :   OptionSet options = SlipRule::expected_options();
      40            2 :   options.doc() =
      41              :       "Power law slip rule defined as \\f$ \\dot{\\gamma}_i = \\dot{\\gamma}_0 \\left| "
      42              :       "\\frac{\\tau_i}{\\hat{\\tau}_i} \\right|^{n-1} \\frac{\\tau_i}{\\hat{\\tau}_i} \\f$ with "
      43              :       "\\f$ \\dot{\\gamma}_i \\f$ the slip rate on system \\f$ i \\f$, \\f$ \\tau_i \\f$ the "
      44              :       "resolved shear, \\f$ \\hat{\\tau}_i \\f$ the slip system strength, \\f$ n \\f$ the rate "
      45            2 :       "senstivity, and \\f$ \\dot{\\gamma}_0 \\f$ a reference slip rate.";
      46              : 
      47            4 :   options.set_parameter<TensorName<Scalar>>("gamma0");
      48            4 :   options.set("gamma0").doc() = "Reference slip rate";
      49              : 
      50            4 :   options.set_parameter<TensorName<Scalar>>("n");
      51            2 :   options.set("n").doc() = "Rate sensitivity exponent";
      52              : 
      53            2 :   return options;
      54            0 : }
      55              : 
      56            2 : PowerLawSlipRule::PowerLawSlipRule(const OptionSet & options)
      57              :   : SlipRule(options),
      58            6 :     _gamma0(declare_parameter<Scalar>("gamma0", "gamma0")),
      59           10 :     _n(declare_parameter<Scalar>("n", "n"))
      60              : {
      61            2 : }
      62              : 
      63              : void
      64            4 : PowerLawSlipRule::set_value(bool out, bool dout_din, bool /*d2out_din2*/)
      65              : {
      66            4 :   const auto D = utils::broadcast_batch_dim(_rss, _tau, _gamma0, _n);
      67              : 
      68            4 :   if (out)
      69            3 :     _g = _gamma0 * pow(abs(_rss / _tau), _n - 1.0) * _rss / _tau;
      70              : 
      71            4 :   if (dout_din)
      72              :   {
      73            2 :     if (_rss.is_dependent())
      74            4 :       _g.d(_rss) =
      75            6 :           Tensor(batch_diag_embed(_gamma0 * _n * pow(abs(_rss / _tau), _n - 1.0) / _tau), D);
      76              : 
      77            2 :     if (_tau.is_dependent())
      78            4 :       _g.d(_tau) = Tensor(batch_diag_embed(-_n * _gamma0 * _rss * pow(abs(_rss.value()), _n - 1.0) /
      79            4 :                                            pow(Scalar(_tau), _n + 1)),
      80            2 :                           D);
      81              :   }
      82            4 : }
      83              : } // namespace neml2