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test_cohesive_1d_element.cc
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test_cohesive_1d_element.cc
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/**
* @file test_cohesive_1d_element.cc
*
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Sun Oct 19 2014
* @date last modification: Wed Jan 10 2018
*
* @brief Test for 1D cohesive elements
*
*
* @section LICENSE
*
* Copyright (©) 2014-2021 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 "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char * argv[]) {
initialize("material.dat", argc, argv);
const UInt max_steps = 2000;
const Real strain_rate = 5;
UInt spatial_dimension = 1;
Mesh mesh(spatial_dimension, "mesh");
mesh.read("bar.msh");
Math::setTolerance(1e-7);
SolidMechanicsModelCohesive model(mesh);
model.initFull(_analysis_method = _explicit_lumped_mass,
_is_extrinsic = true);
auto time_step = model.getStableTimeStep() * 0.01;
model.setTimeStep(time_step);
std::cout << "Time step: " << time_step << std::endl;
auto posx_max = mesh.getUpperBounds()(_x);
auto posx_min = mesh.getLowerBounds()(_x);
/// initial conditions
const auto & position = mesh.getNodes();
auto & velocity = model.getVelocity();
auto nb_nodes = mesh.getNbNodes();
for (UInt n = 0; n < nb_nodes; ++n)
velocity(n) = strain_rate * (position(n) - (posx_max + posx_min) / 2.);
/// boundary conditions
model.applyBC(BC::Dirichlet::FlagOnly(_x), "left");
model.applyBC(BC::Dirichlet::FlagOnly(_x), "right");
auto disp_increment = strain_rate * (posx_max - posx_min) / 2. * time_step;
model.assembleInternalForces();
for (UInt s = 1; s <= max_steps; ++s) {
model.checkCohesiveStress();
model.solveStep();
auto nb_cohesive_elements = mesh.getNbElement(_cohesive_1d_2);
if (s % 10 == 0) {
std::cout << "passing step " << s << "/" << max_steps
<< ", number of cohesive elemets:" << nb_cohesive_elements
<< std::endl;
}
/// update external work and boundary conditions
model.applyBC(BC::Dirichlet::IncrementValue(-disp_increment, _x), "left");
model.applyBC(BC::Dirichlet::IncrementValue(disp_increment, _x), "right");
}
auto Ed = model.getEnergy("dissipated");
auto Edt = 100. * 3.;
std::cout << Ed << " " << Edt << std::endl;
if (std::abs(Ed - Edt) > 0.001 || std::isnan(Ed)) {
std::cout << "The dissipated energy is incorrect" << std::endl;
finalize();
return EXIT_FAILURE;
}
finalize();
return EXIT_SUCCESS;
}

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