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test_assembling_K_cohe_elements.cc
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test_assembling_K_cohe_elements.cc
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/**
* @file test_assembling_K_cohe_elements.cc
*
* @author Mauro Corrado <mauro.corrado@epfl.ch>
*
* @date creation: Fri May 15 2015
* @date last modification: Thu Aug 20 2015
*
* @brief Test to check the correct matrix assembling for cohesive elements
* with degenerated nodes
*
* @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 "dof_manager.hh"
#include "non_linear_solver.hh"
#include "solid_mechanics_model_cohesive.hh"
#include "sparse_matrix.hh"
/* -------------------------------------------------------------------------- */
#include <fstream>
#include <iostream>
#include <limits>
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char * argv[]) {
initialize("material.dat", argc, argv);
debug::setDebugLevel(dblWarning);
const UInt spatial_dimension = 2;
Real increment = 0.004;
bool passed = true;
Real tol = 1.0e-13;
Mesh mesh(spatial_dimension);
mesh.read("quadrangle.msh");
SolidMechanicsModelCohesive model(mesh);
/// model initialization
model.initFull(SolidMechanicsModelCohesiveOptions(_static, true));
/// CohesiveElementInserter
model.limitInsertion(_y, -0.001, 0.001);
model.updateAutomaticInsertion();
Array<bool> & boundary = model.getBlockedDOFs();
Array<Real> & position = mesh.getNodes();
Array<Real> & displacement = model.getDisplacement();
// SparseMatrix & K_test = model.getStiffnessMatrix();
Array<Real> K_verified(0, 3, "K_matrix_verified");
Array<Real> K_test(0, 3, "K_matrix_test");
/// load the verified stiffness matrix
Vector<Real> tmp(3);
UInt nb_lines;
std::ifstream infile("K_matrix_verified.dat");
std::string line;
if (!infile.good())
AKANTU_DEBUG_ERROR("Cannot open file K_matrix_verified.dat");
else {
for (UInt i = 0; i < 2; ++i) {
getline(infile, line);
std::stringstream sstr_data(line);
if (i == 1) {
sstr_data >> tmp(0) >> tmp(1) >> tmp(2);
nb_lines = tmp(2);
}
}
for (UInt i = 0; i < nb_lines; ++i) {
getline(infile, line);
std::stringstream sstr_data(line);
sstr_data >> tmp(0) >> tmp(1) >> tmp(2);
K_verified.push_back(tmp);
}
}
infile.close();
/// impose boundary conditions
for (UInt n = 0; n < mesh.getNbNodes(); ++n) {
if (position(n, 1) < -0.99) {
boundary(n, 1) = true;
boundary(n, 0) = true;
}
if (position(n, 1) > 0.99 && position(n, 0) < -0.99)
boundary(n, 1) = true;
}
/// solve step
for (UInt n = 0; n < mesh.getNbNodes(); ++n) {
if (position(n, 1) > 0.99 && position(n, 0) < -0.99)
displacement(n, 1) += increment;
}
auto & solver = model.getNonLinearSolver();
solver.set("max_iterations", 10);
solver.set("threshold", 1e-13);
model.solveStep();
model.getDOFManager().getMatrix("K").saveMatrix("K_matrix_test.dat");
/// load the stiffness matrix to be tested
std::ifstream infile2("K_matrix_test.dat");
if (!infile2.good())
AKANTU_DEBUG_ERROR("Cannot open file K_matrix_test.dat");
else {
for (UInt i = 0; i < 2; ++i) {
getline(infile2, line);
std::stringstream sstr_data(line);
if (i == 1) {
sstr_data >> tmp(0) >> tmp(1) >> tmp(2);
nb_lines = tmp(2);
}
}
for (UInt i = 0; i < nb_lines; ++i) {
getline(infile2, line);
std::stringstream sstr_data(line);
sstr_data >> tmp(0) >> tmp(1) >> tmp(2);
K_test.push_back(tmp);
}
}
infile2.close();
for (UInt i = 0; i < K_verified.size(); ++i) {
for (UInt j = 0; j < K_test.size(); ++j) {
if ((K_test(j, 0) == K_verified(i, 0)) &&
(K_test(j, 1) == K_verified(i, 1))) {
if (std::abs(K_verified(i, 2)) < tol) {
if (std::abs(K_test(j, 2)) > tol)
passed = false;
} else {
Real ratio = (std::abs(K_test(j, 2) - K_verified(i, 2))) /
(std::abs(K_verified(i, 2)));
if (ratio > tol)
passed = false;
}
}
}
}
finalize();
if (passed)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
}

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