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rAKA/examples/c++/solid_mechanics_cohesive_model/cohesive_extrinsic/cohesive_extrinsic.cc
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cohesive_extrinsic.cc
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/**
* Copyright (©) 2012-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* 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"
/* -------------------------------------------------------------------------- */
#include <iostream>
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char * argv[]) {
initialize("material.dat", argc, argv);
const Int dim = 2;
const Int max_steps = 1000;
Mesh mesh(dim);
mesh.read("triangle.msh");
SolidMechanicsModelCohesive model(mesh);
/// model initialization
model.initFull(_analysis_method = _explicit_lumped_mass,
_is_extrinsic = true);
Real time_step = model.getStableTimeStep() * 0.05;
model.setTimeStep(time_step);
std::cout << "Time step: " << time_step << "\n";
// updated the insertion limits
CohesiveElementInserter & inserter = model.getElementInserter();
inserter.setLimit(_y, 0.30, 0.20);
model.updateAutomaticInsertion();
Array<Real> & position = mesh.getNodes();
Array<Real> & velocity = model.getVelocity();
Array<bool> & boundary = model.getBlockedDOFs();
Array<Real> & displacement = model.getDisplacement();
Int nb_nodes = mesh.getNbNodes();
/// boundary conditions
for (auto && [pos, boun] :
zip(make_view(position, dim), make_view(boundary, dim))) {
if (pos(_y) > 0.99 or pos(_y) < -0.99) {
boun(_y) = true;
}
if (pos(_x) > 0.99 or pos(_x) < -0.99) {
boun(_x) = true;
}
}
model.setBaseName("extrinsic");
model.addDumpFieldVector("displacement");
model.addDumpField("velocity");
model.addDumpField("acceleration");
model.addDumpField("internal_force");
model.addDumpField("stress");
model.addDumpField("grad_u");
model.dump();
/// initial conditions
Real loading_rate = 0.5;
Real disp_update = loading_rate * time_step;
for (auto && [pos, vel] :
zip(make_view(position, dim), make_view(velocity, dim))) {
vel(_y) = loading_rate * pos(_y);
}
/// Main loop
for (Int s = 1; s <= max_steps; ++s) {
/// update displacement on extreme nodes
for (auto && [pos, disp] :
zip(make_view(position, dim), make_view(displacement, dim))) {
if (pos(_y) > 0.99 or pos(_y) < -0.99) {
disp(_y) += disp_update * pos(_y);
}
}
// check wether cohesive elements should be inserted
model.checkCohesiveStress();
model.solveStep();
if (s % 10 == 0) {
model.dump();
std::cout << "passing step " << s << "/" << max_steps << "\n";
}
}
Real Ed = model.getEnergy("dissipated");
Real Edt = 200 * std::sqrt(2);
std::cout << Ed << " " << Edt << "\n";
if (Ed < Edt * 0.999 || Ed > Edt * 1.001 || std::isnan(Ed)) {
std::cout << "The dissipated energy is incorrect"
<< "\n";
return -1;
}
return 0;
}
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