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test_material_elasto_plastic_linear_isotropic_hardening.cc
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test_material_elasto_plastic_linear_isotropic_hardening.cc
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/**
* @file test_material_elasto_plastic_linear_isotropic_hardening.cc
*
* @author Jaehyun Cho <jaehyun.cho@epfl.ch>
* @author Lucas Frerot <lucas.frerot@epfl.ch>
*
* @date creation: Thu Dec 03 2015
*
* @brief test for material type elasto plastic linear isotropic hardening
* using tension-compression test
*
* @section LICENSE
*
* Copyright (©) 2015 EPFL (Ecole Polytechnique Fédérale de Lausanne) Laboratory
* (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "non_linear_solver.hh"
#include "solid_mechanics_model.hh"
/* -------------------------------------------------------------------------- */
#include <iostream>
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
initialize("test_material_elasto_plastic_linear_isotropic_hardening.dat",
argc, argv);
const UInt spatial_dimension = 2;
const Real u_increment = 0.1;
const UInt steps = 20;
Mesh mesh(spatial_dimension);
mesh.read("test_material_elasto_plastic_linear_isotropic_hardening.msh");
SolidMechanicsModel model(mesh);
model.initFull(_analysis_method = _static);
auto & solver = model.getNonLinearSolver("static");
solver.set("max_iterations", 300);
solver.set("threshold", 1e-5);
model.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "left");
model.applyBC(BC::Dirichlet::FixedValue(0.0, _y), "bottom");
std::cout.precision(4);
for (UInt i = 0; i < steps; ++i) {
model.applyBC(BC::Dirichlet::FixedValue(i * u_increment, _x), "right");
try {
model.solveStep();
} catch (debug::NLSNotConvergedException & e) {
std::cout << e.niter << " " << e.error << std::endl;
throw;
}
Real strainxx = i * u_increment / 10.;
const Array<UInt> & edge_nodes = mesh.getElementGroup("right").getNodes();
Array<Real> & residual = model.getInternalForce();
Real reaction = 0;
for (UInt n = 0; n < edge_nodes.size(); n++) {
reaction -= residual(edge_nodes(n), 0);
}
std::cout << strainxx << "," << reaction << std::endl;
}
finalize();
return 0;
}

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