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/AssociativeIsotropicPlasticHardening.h"
      26              : #include "neml2/tensors/Scalar.h"
      27              : 
      28              : namespace neml2
      29              : {
      30              : register_NEML2_object(AssociativeIsotropicPlasticHardening);
      31              : 
      32              : OptionSet
      33            2 : AssociativeIsotropicPlasticHardening::expected_options()
      34              : {
      35            2 :   OptionSet options = FlowRule::expected_options();
      36            2 :   options.doc() += " This object calculates the rate of equivalent plastic strain following "
      37              :                    "associative flow rule, i.e. \\f$ \\dot{\\varepsilon}_p = - \\dot{\\gamma} "
      38              :                    "\\frac{\\partial f}{\\partial k} \\f$, where \\f$ \\dot{\\varepsilon}_p \\f$ "
      39              :                    "is the equivalent plastic strain, \\f$ \\dot{\\gamma} \\f$ is the flow rate, "
      40            2 :                    "\\f$ f \\f$ is the yield function, and \\f$ k \\f$ is the isotropic hardening.";
      41              : 
      42            6 :   options.set_input("isotropic_hardening_direction") = VariableName(STATE, "internal", "Nk");
      43            4 :   options.set("isotropic_hardening_direction").doc() =
      44            2 :       "Direction of associative isotropic hardening which can be calculated using Normality.";
      45              : 
      46            6 :   options.set_output("equivalent_plastic_strain_rate") = VariableName(STATE, "internal", "ep_rate");
      47            2 :   options.set("equivalent_plastic_strain_rate").doc() = "Rate of equivalent plastic strain";
      48              : 
      49            2 :   return options;
      50            0 : }
      51              : 
      52            2 : AssociativeIsotropicPlasticHardening::AssociativeIsotropicPlasticHardening(
      53            2 :     const OptionSet & options)
      54              :   : FlowRule(options),
      55            2 :     _Nk(declare_input_variable<Scalar>("isotropic_hardening_direction")),
      56            4 :     _ep_dot(declare_output_variable<Scalar>("equivalent_plastic_strain_rate"))
      57              : {
      58            2 : }
      59              : 
      60              : void
      61            4 : AssociativeIsotropicPlasticHardening::set_value(bool out, bool dout_din, bool /*d2out_din2*/)
      62              : {
      63              :   // For associative flow,
      64              :   // ep_dot = - gamma_dot * Nk
      65              :   //     Nk = df/dk
      66              : 
      67            4 :   if (out)
      68            3 :     _ep_dot = -_gamma_dot * _Nk;
      69              : 
      70            4 :   if (dout_din)
      71              :   {
      72            2 :     if (_gamma_dot.is_dependent())
      73            2 :       _ep_dot.d(_gamma_dot) = -_Nk;
      74              : 
      75            2 :     if (_Nk.is_dependent())
      76            2 :       _ep_dot.d(_Nk) = -_gamma_dot;
      77              :   }
      78            4 : }
      79              : } // namespace neml2