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test_cohesive_extrinsic.cc
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test_cohesive_extrinsic.cc
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/**
* @file test_cohesive_extrinsic.cc
*
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Tue May 08 2012
* @date last modification: Fri Sep 19 2014
*
* @brief Test for cohesive elements
*
* @section LICENSE
*
* Copyright (©) 2014 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);
debug::setDebugLevel(dblWarning);
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));
model.limitInsertion(_y, -0.30, -0.20);
model.updateAutomaticInsertion();
Real time_step = model.getStableTimeStep()*0.05;
model.setTimeStep(time_step);
std::cout << "Time step: " << time_step << std::endl;
model.assembleMassLumped();
Array<Real> & position = mesh.getNodes();
Array<Real> & velocity = model.getVelocity();
Array<bool> & boundary = model.getBlockedDOFs();
Array<Real> & displacement = model.getDisplacement();
// const Array<Real> & residual = model.getResidual();
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;
}
/// 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);
}
model.updateResidual();
model.setBaseName("extrinsic");
model.addDumpFieldVector("displacement");
model.addDumpField("velocity" );
model.addDumpField("acceleration");
model.addDumpField("residual" );
model.addDumpFieldTensor("stress");
model.addDumpField("strain");
model.addDumpField("damage");
model.addDumpFieldToDumper("cohesive elements", "damage");
model.addDumpFieldVectorToDumper("cohesive elements", "displacement");
model.dump();
model.dump("cohesive elements");
// std::ofstream edis("edis.txt");
// std::ofstream erev("erev.txt");
// Array<Real> & residual = model.getResidual();
// const Array<Real> & stress = model.getMaterial(0).getStress(type);
/// Main loop
for (UInt s = 1; s <= max_steps; ++s) {
/// update displacement on extreme nodes
for (UInt n = 0; n < mesh.getNbNodes(); ++n) {
if (position(n, 1) > 0.99 || position(n, 1) < -0.99)
displacement(n, 1) += disp_update * position(n, 1);
}
model.checkCohesiveStress();
model.solveStep();
if(s % 100 == 0) {
model.dump();
model.dump("cohesive elements");
std::cout << "passing step " << s << "/" << max_steps << std::endl;
}
// Real Ed = dynamic_cast<MaterialCohesive&> (model.getMaterial(1)).getDissipatedEnergy();
// Real Er = dynamic_cast<MaterialCohesive&> (model.getMaterial(1)).getReversibleEnergy();
// edis << s << " "
// << Ed << std::endl;
// erev << s << " "
// << Er << std::endl;
}
// edis.close();
// erev.close();
// mesh.write("mesh_final.msh");
model.dump();
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;
finalize();
return EXIT_FAILURE;
}
finalize();
std::cout << "OK: test_cohesive_extrinsic was passed!" << std::endl;
return EXIT_SUCCESS;
}

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