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contact_explicit_dynamic.cc
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contact_explicit_dynamic.cc
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/**
* @file contact_explicit_dynamic.cc
*
* @author Mohit Pundir <mohit.pundir@epfl.ch>
*
* @date creation: Thu Feb 21 2013
* @date last modification: Sun Jun 06 2021
*
* @brief Contact mechanics example in dynamic
*
*
* @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 "contact_mechanics_model.hh"
#include "coupler_solid_contact.hh"
#include "non_linear_solver.hh"
#include "solid_mechanics_model.hh"
#include "surface_selector.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
const UInt spatial_dimension = 2;
initialize("material.dat", argc, argv);
Real time_step;
Real time_factor = 0.1;
UInt max_steps = 20000;
Real max_displacement = 5e-3;
Mesh mesh(spatial_dimension);
mesh.read("hertz.msh");
CouplerSolidContact coupler(mesh);
auto & solid = coupler.getSolidMechanicsModel();
auto & contact = coupler.getContactMechanicsModel();
auto && selector = std::make_shared<MeshDataMaterialSelector<std::string>>(
"physical_names", solid);
solid.setMaterialSelector(selector);
coupler.initFull(_analysis_method = _explicit_lumped_mass);
auto && surface_selector = std::make_shared<PhysicalSurfaceSelector>(mesh);
contact.getContactDetector().setSurfaceSelector(surface_selector);
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "fixed");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _y), "fixed");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "loading");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "symmetry");
time_step = solid.getStableTimeStep();
time_step *= time_factor;
std::cout << "Time Step = " << time_step << "s (" << time_step << "s)"
<< std::endl;
coupler.setTimeStep(time_step);
coupler.setBaseName("contact-explicit-dynamic");
coupler.addDumpFieldVector("displacement");
coupler.addDumpFieldVector("velocity");
coupler.addDumpFieldVector("normals");
coupler.addDumpFieldVector("contact_force");
coupler.addDumpFieldVector("external_force");
coupler.addDumpFieldVector("internal_force");
coupler.addDumpField("gaps");
coupler.addDumpField("areas");
coupler.addDumpField("blocked_dofs");
coupler.addDumpField("grad_u");
coupler.addDumpField("stress");
auto & velocity = solid.getVelocity();
auto & gaps = contact.getGaps();
Real damping_ratio = 0.99;
auto increment = max_displacement / max_steps;
for (auto i : arange(max_steps)) {
solid.applyBC(BC::Dirichlet::IncrementValue(-increment, _y), "loading");
coupler.solveStep();
// damping velocities only along the contacting zone
for (auto && tuple : zip(gaps, make_view(velocity, spatial_dimension))) {
auto & gap = std::get<0>(tuple);
auto & vel = std::get<1>(tuple);
if (gap > 0) {
vel *= damping_ratio;
}
}
// dumping energies
if (i % 1000 == 0) {
Real epot = solid.getEnergy("potential");
Real ekin = solid.getEnergy("kinetic");
std::cerr << i << "," << i * increment << "," << epot << "," << ekin
<< "," << epot + ekin << "," << std::endl;
}
if (i % 1000 == 0) {
coupler.dump();
}
}
finalize();
return EXIT_SUCCESS;
}

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