Line data    Source code

       1             : //* This file is part of the MOOSE framework
       2             : //* https://mooseframework.inl.gov
       3             : //*
       4             : //* All rights reserved, see COPYRIGHT for full restrictions
       5             : //* https://github.com/idaholab/moose/blob/master/COPYRIGHT
       6             : //*
       7             : //* Licensed under LGPL 2.1, please see LICENSE for details
       8             : //* https://www.gnu.org/licenses/lgpl-2.1.html
       9             : 
      10             : #include "PowerLawSoftening.h"
      11             : 
      12             : #include "MooseMesh.h"
      13             : 
      14             : registerMooseObject("SolidMechanicsApp", PowerLawSoftening);
      15             : 
      16             : InputParameters
      17          48 : PowerLawSoftening::validParams()
      18             : {
      19          48 :   InputParameters params = SmearedCrackSofteningBase::validParams();
      20          48 :   params.addClassDescription("Softening model with an abrupt stress release upon cracking. This "
      21             :                              "class is intended to be used with ComputeSmearedCrackingStress.");
      22          96 :   params.addRequiredRangeCheckedParam<Real>(
      23             :       "stiffness_reduction",
      24             :       "stiffness_reduction <= 1 & stiffness_reduction >= 0",
      25             :       "Factor multiplied by the current stiffness each time a new crack forms");
      26          48 :   return params;
      27           0 : }
      28             : 
      29          36 : PowerLawSoftening::PowerLawSoftening(const InputParameters & parameters)
      30             :   : SmearedCrackSofteningBase(parameters),
      31          72 :     _stiffness_reduction(getParam<Real>("stiffness_reduction"))
      32             : {
      33          36 : }
      34             : 
      35             : void
      36       24832 : PowerLawSoftening::computeCrackingRelease(Real & stress,
      37             :                                           Real & stiffness_ratio,
      38             :                                           const Real strain,
      39             :                                           const Real /*crack_initiation_strain*/,
      40             :                                           const Real /*crack_max_strain*/,
      41             :                                           const Real cracking_stress,
      42             :                                           const Real youngs_modulus)
      43             : {
      44       24832 :   if (stress > cracking_stress)
      45             :   {
      46             :     // This is equivalent to k = k_0 * (stiffness_reduction)^n, where n is the number of cracks
      47         384 :     stiffness_ratio *= _stiffness_reduction;
      48         384 :     stress = stiffness_ratio * youngs_modulus * strain;
      49             :   }
      50       24832 : }