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cohesive_extrinsic.cc
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cohesive_extrinsic.cc
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/**
* @file cohesive_extrinsic.cc
*
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Sun Oct 19 2014
*
* @brief Test for cohesive elements
*
* @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 <limits>
#include <fstream>
#include <iostream>
/* -------------------------------------------------------------------------- */
#include "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char *argv[]) {
initialize("material.dat", argc, argv);
const UInt spatial_dimension = 2;
const UInt max_steps = 1000;
Mesh mesh(spatial_dimension);
mesh.read("triangle.msh");
SolidMechanicsModelCohesive model(mesh);
/// model initialization
model.initFull(SolidMechanicsModelCohesiveOptions(_explicit_lumped_mass, true));
Real time_step = model.getStableTimeStep()*0.05;
model.setTimeStep(time_step);
std::cout << "Time step: " << time_step << std::endl;
CohesiveElementInserter & inserter = model.getElementInserter();
inserter.setLimit(_y, 0.30, 0.20);
model.updateAutomaticInsertion();
Array<Real> & position = mesh.getNodes();
Array<Real> & velocity = model.getVelocity();
Array<bool> & boundary = model.getBlockedDOFs();
Array<Real> & displacement = model.getDisplacement();
UInt nb_nodes = mesh.getNbNodes();
/// boundary conditions
for (UInt n = 0; n < nb_nodes; ++n) {
if (position(n, 1) > 0.99 || position(n, 1) < -0.99)
boundary(n, 1) = true;
if (position(n, 0) > 0.99 || position(n, 0) < -0.99)
boundary(n, 0) = true;
}
model.updateResidual();
model.setBaseName("extrinsic");
model.addDumpFieldVector("displacement");
model.addDumpField("velocity" );
model.addDumpField("acceleration");
model.addDumpField("residual" );
model.addDumpField("stress");
model.addDumpField("grad_u");
model.dump();
/// initial conditions
Real loading_rate = 0.5;
Real disp_update = loading_rate * time_step;
for (UInt n = 0; n < nb_nodes; ++n) {
velocity(n, 1) = loading_rate * position(n, 1);
}
/// Main loop
for (UInt s = 1; s <= max_steps; ++s) {
/// update displacement on extreme nodes
for (UInt n = 0; n < nb_nodes; ++n) {
if (position(n, 1) > 0.99 || position(n, 1) < -0.99)
displacement(n, 1) += disp_update * position(n, 1);
}
model.checkCohesiveStress();
model.explicitPred();
model.updateResidual();
model.updateAcceleration();
model.explicitCorr();
if(s % 10 == 0) {
model.dump();
std::cout << "passing step " << s << "/" << max_steps << std::endl;
}
}
Real Ed = model.getEnergy("dissipated");
Real Edt = 200*std::sqrt(2);
std::cout << Ed << " " << Edt << std::endl;
if (Ed < Edt * 0.999 || Ed > Edt * 1.001 || std::isnan(Ed)) {
std::cout << "The dissipated energy is incorrect" << std::endl;
return EXIT_FAILURE;
}
finalize();
std::cout << "OK: test_cohesive_extrinsic was passed!" << std::endl;
return EXIT_SUCCESS;
}

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