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/RateIndependentPlasticFlowConstraint.h"
      26              : #include "neml2/tensors/Scalar.h"
      27              : #include "neml2/tensors/functions/sqrt.h"
      28              : 
      29              : namespace neml2
      30              : {
      31              : register_NEML2_object(RateIndependentPlasticFlowConstraint);
      32              : 
      33              : OptionSet
      34            2 : RateIndependentPlasticFlowConstraint::expected_options()
      35              : {
      36            2 :   OptionSet options = Model::expected_options();
      37            2 :   options.doc() = "Solve the consistent plasticity yield envelope by solving the equivalent "
      38              :                   "complementarity condition \\f[ r = \\dot{\\gamma} - f^p - "
      39            2 :                   "\\sqrt{{\\dot{\\gamma}}^2 + {f^p}^2} \\f]";
      40              : 
      41            6 :   options.set_input("yield_function") = VariableName(STATE, "internal", "fp");
      42            2 :   options.set("yield_function").doc() = "Yield function";
      43              : 
      44            6 :   options.set_input("flow_rate") = VariableName(STATE, "internal", "gamma_rate");
      45            2 :   options.set("flow_rate").doc() = "Flow rate";
      46              : 
      47            2 :   return options;
      48            0 : }
      49              : 
      50            1 : RateIndependentPlasticFlowConstraint::RateIndependentPlasticFlowConstraint(
      51            1 :     const OptionSet & options)
      52              :   : Model(options),
      53            1 :     _fp(declare_input_variable<Scalar>("yield_function")),
      54            1 :     _gamma_dot(declare_input_variable<Scalar>("flow_rate")),
      55            2 :     _r(declare_output_variable<Scalar>(_gamma_dot.name().remount(RESIDUAL)))
      56              : {
      57            1 : }
      58              : 
      59              : void
      60            2 : RateIndependentPlasticFlowConstraint::set_value(bool out, bool dout_din, bool /*d2out_din2*/)
      61              : {
      62            2 :   const auto FB = _gamma_dot - _fp - sqrt(_gamma_dot * _gamma_dot + _fp * _fp);
      63              : 
      64            2 :   if (out)
      65            1 :     _r = FB;
      66              : 
      67            2 :   if (dout_din)
      68              :   {
      69            1 :     const auto I = Scalar::identity_map(_gamma_dot.options());
      70            1 :     const auto eps = machine_precision(_gamma_dot.scalar_type());
      71              : 
      72            1 :     if (_gamma_dot.is_dependent())
      73            1 :       _r.d(_gamma_dot) = I - _gamma_dot / sqrt(_gamma_dot * _gamma_dot + _fp * _fp + eps);
      74              : 
      75            1 :     if (_fp.is_dependent())
      76            1 :       _r.d(_fp) = -I - _fp / sqrt(_gamma_dot * _gamma_dot + _fp * _fp + eps);
      77            1 :   }
      78            2 : }
      79              : 
      80              : } // namespace neml2