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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: Mon Jan 18 2016
*
* @brief Test for cohesive elements
*
* @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 "mesh_iterators.hh"
#include "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
#include <iostream>
/* -------------------------------------------------------------------------- */
using namespace akantu;
static void updateDisplacement(SolidMechanicsModelCohesive &, Array<UInt> &,
ElementType, Real);
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
initialize("material.dat", argc, argv);
const UInt spatial_dimension = 2;
const UInt max_steps = 350;
const ElementType type = _triangle_6;
Mesh mesh(spatial_dimension);
mesh.read("triangle.msh");
CohesiveElementInserter inserter(mesh);
inserter.setLimit(_x, -0.26, -0.24);
inserter.insertIntrinsicElements();
SolidMechanicsModelCohesive model(mesh);
/// model initialization
model.initFull();
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
Array<UInt> elements;
Vector<Real> barycenter(spatial_dimension);
for_each_element(mesh, [&](auto && el) {
mesh.getBarycenter(el, barycenter);
if (barycenter(_x) > -0.25)
elements.push_back(el.element);
});
Real increment = 0.01;
updateDisplacement(model, elements, type, increment);
/// Main loop
for (UInt s = 1; s <= max_steps; ++s) {
model.solveStep();
updateDisplacement(model, elements, type, 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,
Array<UInt> & elements, ElementType type,
Real increment) {
Mesh & mesh = model.getMesh();
UInt nb_element = elements.size();
UInt nb_nodes = mesh.getNbNodes();
UInt nb_nodes_per_element = mesh.getNbNodesPerElement(type);
const Array<UInt> & connectivity = mesh.getConnectivity(type);
Array<Real> & displacement = model.getDisplacement();
Array<bool> update(nb_nodes);
update.clear();
for (UInt el = 0; el < nb_element; ++el) {
for (UInt n = 0; n < nb_nodes_per_element; ++n) {
UInt node = connectivity(elements(el), n);
if (!update(node)) {
displacement(node, 0) -= increment;
// displacement(node, 1) += increment;
update(node) = true;
}
}
}
}

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