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cohesive_intrinsic.cc
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cohesive_intrinsic.cc
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/**
* @file cohesive_intrinsic.cc
*
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Tue May 08 2012
* @date last modification: Fri Jul 19 2019
*
* @brief Cohesive element example in intrinsic
*
*
* @section LICENSE
*
* Copyright (©) 2015-2021 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 "element_group.hh"
#include "mesh_iterators.hh"
#include "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
#include <iostream>
/* -------------------------------------------------------------------------- */
using namespace akantu;
static void updateDisplacement(SolidMechanicsModelCohesive &,
const ElementGroup &, Real);
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
initialize("material.dat", argc, argv);
const UInt spatial_dimension = 2;
const UInt max_steps = 350;
Mesh mesh(spatial_dimension);
mesh.read("triangle.msh");
SolidMechanicsModelCohesive model(mesh);
model.getElementInserter().setLimit(_x, -0.26, -0.24);
/// model initialization
model.initFull(_analysis_method = _explicit_lumped_mass,
_is_extrinsic = false);
Real time_step = model.getStableTimeStep() * 0.8;
model.setTimeStep(time_step);
std::cout << "Time step: " << time_step << std::endl;
Array<bool> & boundary = model.getBlockedDOFs();
UInt nb_nodes = mesh.getNbNodes();
/// boundary conditions
for (UInt dim = 0; dim < spatial_dimension; ++dim) {
for (UInt n = 0; n < nb_nodes; ++n) {
boundary(n, dim) = true;
}
}
model.setBaseName("intrinsic");
model.addDumpFieldVector("displacement");
model.addDumpField("velocity");
model.addDumpField("acceleration");
model.addDumpField("stress");
model.addDumpField("grad_u");
model.addDumpField("external_force");
model.addDumpField("internal_force");
model.dump();
/// update displacement
auto && elements = mesh.createElementGroup("diplacement");
Vector<Real> barycenter(spatial_dimension);
for_each_element(
mesh,
[&](auto && el) {
mesh.getBarycenter(el, barycenter);
if (barycenter(_x) > -0.25)
elements.add(el, true);
},
_element_kind = _ek_regular);
Real increment = 0.01;
updateDisplacement(model, elements, increment);
/// Main loop
for (UInt s = 1; s <= max_steps; ++s) {
model.solveStep();
updateDisplacement(model, elements, increment);
if (s % 1 == 0) {
model.dump();
std::cout << "passing step " << s << "/" << max_steps << std::endl;
}
}
Real Ed = model.getEnergy("dissipated");
Real Edt = 2 * 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();
return EXIT_SUCCESS;
}
/* -------------------------------------------------------------------------- */
static void updateDisplacement(SolidMechanicsModelCohesive & model,
const ElementGroup & group, Real increment) {
Array<Real> & displacement = model.getDisplacement();
for (auto && node : group.getNodeGroup().getNodes()) {
displacement(node, 0) += increment;
}
}

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