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test_cohesive_intrinsic_impl.cc
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test_cohesive_intrinsic_impl.cc
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/**
* @file test_cohesive_intrinsic_impl.cc
*
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Mon Jul 09 2012
* @date last modification: Sun Oct 19 2014
*
* @brief Test for cohesive elements
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014, 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"
#include "material_cohesive.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char *argv[]) {
initialize("material.dat", argc, argv);
debug::setDebugLevel(dblError);
const UInt spatial_dimension = 2;
const ElementType type = _triangle_6;
Mesh mesh(spatial_dimension);
mesh.read("implicit.msh");
CohesiveElementInserter inserter(mesh);
inserter.setLimit(_y, 0.9, 1.1);
inserter.insertIntrinsicElements();
// mesh.write("implicit_cohesive.msh");
SolidMechanicsModelCohesive model(mesh);
/// model initialization
model.initFull(SolidMechanicsModelCohesiveOptions(_static));
/// boundary conditions
Array<bool> & boundary = model.getBlockedDOFs();
UInt nb_nodes = mesh.getNbNodes();
Array<Real> & position = mesh.getNodes();
Array<Real> & displacement = model.getDisplacement();
const ElementType type_facet = mesh.getFacetType(type);
for (UInt n = 0; n < nb_nodes; ++n) {
if (std::abs(position(n,1))< Math::getTolerance()){
boundary(n, 1) = true;
displacement(n,1) = 0.0;
}
if ((std::abs(position(n,0))< Math::getTolerance())&& (position(n,1)< 1.1)){
boundary(n, 0) = true;
displacement(n,0) = 0.0;
}
if ((std::abs(position(n,0)-1)< Math::getTolerance())&&(std::abs(position(n,1)-1)< Math::getTolerance())){
boundary(n, 0) = true;
displacement(n,0) = 0.0;
}
if (std::abs(position(n,1)-2)< Math::getTolerance()){
boundary(n, 1) = true;
}
}
model.setBaseName("intrinsic_impl");
model.addDumpField("displacement");
// model.addDumpField("mass" );
model.addDumpField("velocity" );
model.addDumpField("acceleration");
model.addDumpField("force" );
model.addDumpField("residual" );
// model.addDumpField("damage" );
model.addDumpField("stress" );
model.addDumpField("strain" );
model.dump();
const MaterialCohesive & mat_coh = dynamic_cast< const MaterialCohesive &> (model.getMaterial(1));
ElementType type_cohesive = FEEngine::getCohesiveElementType(type_facet);
const Array<Real> & opening = mat_coh.getOpening(type_cohesive);
//const Array<Real> & traction = mat_coh.getTraction(type_cohesive);
model.updateResidual();
const Array<Real> & residual = model.getResidual();
UInt max_step = 1000;
Real increment = 3./max_step;
Real error_tol = 10e-6;
std::ofstream fout;
fout.open("output");
/// Main loop
for ( UInt nstep = 0; nstep < max_step; ++nstep){
for (UInt n = 0; n < nb_nodes; ++n) {
if (std::abs(position(n,1)-2)< Math::getTolerance()){
displacement(n,1) += increment;
}
}
__attribute__ ((unused)) bool converged = model.solveStep<_scm_newton_raphson_tangent, _scc_residual>(1e-5, 100);
AKANTU_DEBUG_ASSERT(converged, "Did not converge");
// model.dump();
Real resid = 0;
for (UInt n = 0; n < nb_nodes; ++n) {
if (std::abs(position(n, 1) - 2.)/2. < Math::getTolerance()){
resid += residual(n, 1);
}
}
Real analytical = exp(1) * std::abs(opening(0, 1)) * exp (-std::abs(opening(0, 1))/0.5)/0.5;
//the residual force is comparing with the theoretical value of the cohesive law
error_tol = std::abs((std::abs(resid) - analytical)/analytical);
fout << nstep << " " << -resid << " " << analytical << " " << error_tol << std::endl;
if (error_tol > 1e-3) {
std::cout << "Relative error: " << error_tol << std::endl;
std::cout << "Test failed!" << std::endl;
return EXIT_FAILURE;
}
}
model.dump();
fout.close();
finalize();
std::cout << "Test passed!" << std::endl;
return EXIT_SUCCESS;
}

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