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/elasticity/GeneralElasticity.h"
      26              : #include "neml2/tensors/SSFR5.h"
      27              : #include "neml2/tensors/SSSSR8.h"
      28              : #include "neml2/tensors/Tensor.h"
      29              : 
      30              : namespace neml2
      31              : {
      32              : register_NEML2_object(GeneralElasticity);
      33              : 
      34              : OptionSet
      35            2 : GeneralElasticity::expected_options()
      36              : {
      37            2 :   OptionSet options = AnisotropicElasticity::expected_options();
      38            2 :   options.doc() += " This verion implements a general relation using the elasticity tensor, "
      39            2 :                    "expressed as an SSR4 object";
      40              : 
      41            4 :   options.set_parameter<TensorName<SSR4>>("elastic_stiffness_tensor");
      42            2 :   options.set("elastic_stiffness_tensor").doc() = "Elastic stiffness tensor";
      43              : 
      44            2 :   return options;
      45            0 : }
      46              : 
      47            5 : GeneralElasticity::GeneralElasticity(const OptionSet & options)
      48              :   : AnisotropicElasticity(options),
      49           20 :     _T(declare_parameter<SSR4>("T", "elastic_stiffness_tensor", /*allow nonlinear=*/true))
      50              : {
      51            5 : }
      52              : 
      53              : void
      54           10 : GeneralElasticity::set_value(bool out, bool dout_din, bool /*d2out_din2*/)
      55              : {
      56           10 :   const auto A = _T.rotate(_R);
      57           10 :   const auto Ainv = _compliance ? A.inverse() : SSR4();
      58              : 
      59           10 :   if (out)
      60            7 :     _to = (_compliance ? Ainv : A) * _from;
      61              : 
      62           10 :   if (dout_din)
      63              :   {
      64            5 :     if (_from.is_dependent())
      65            5 :       _to.d(_from) = _compliance ? Ainv : A;
      66              : 
      67            5 :     if (_R.is_dependent())
      68              :     {
      69            5 :       const auto dA_dR = _T.drotate(_R);
      70           20 :       const auto batch_sizes = utils::broadcast_batch_sizes({dA_dR, _from.value()});
      71            5 :       if (_compliance)
      72            4 :         _to.d(_R) =
      73           16 :             Tensor(at::einsum("...ijkl,...klm,...j", {A.dinverse(), dA_dR, _from}), batch_sizes);
      74              :       else
      75           12 :         _to.d(_R) = Tensor(at::einsum("...ijk,...j", {dA_dR, _from}), batch_sizes);
      76            5 :     }
      77              : 
      78           15 :     if (const auto * const T = nl_param("T"))
      79              :     {
      80            2 :       const auto dA_dT = _T.drotate_self(_R);
      81            8 :       const auto batch_sizes = utils::broadcast_batch_sizes({dA_dT, _from.value()});
      82            2 :       if (_compliance)
      83            2 :         _to.d(*T) =
      84            8 :             Tensor(at::einsum("...ijkl,...klmn,...j", {A.dinverse(), dA_dT, _from}), batch_sizes);
      85              :       else
      86            4 :         _to.d(*T) = Tensor(at::einsum("...ijkl,...j", {dA_dT, _from}), batch_sizes);
      87            2 :     }
      88              :   }
      89           31 : }
      90              : } // namespace neml2