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bloc_friction.cc
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Wed, Dec 11, 19:01

bloc_friction.cc
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/**
* Copyright (©) 2013-2023 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 "coupler_solid_contact.hh"
#include "non_linear_solver.hh"
#include <fstream>
#include <iomanip>
#include <vector>
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
int main(int argc, char *argv[]) {
// Initialize the material database
initialize("material.dat", argc, argv);
// Create the mesh>
Mesh mesh(2); // Dimension 2
// Read the mesh
mesh.read("bloc.msh");
// Create the model
CouplerSolidContact coupler(mesh);
// Initialize each model
auto &solid = coupler.getSolidMechanicsModel();
auto &contact = coupler.getContactMechanicsModel();
auto &&selector = std::make_shared<MeshDataMaterialSelector<std::string>>(
"physical_names", solid);
solid.setMaterialSelector(selector);
// Initialize the coupler
coupler.initFull(_analysis_method = _explicit_lumped_mass);
Real time_step = solid.getStableTimeStep() * 0.1;
coupler.setTimeStep(time_step);
std::cout << "Time step: " << time_step << std::endl;
// Setup the contact
auto &&surface_selector = std::make_shared<PhysicalSurfaceSelector>(mesh);
contact.getContactDetector().setSurfaceSelector(surface_selector);
// Configuration of the dumper
coupler.setBaseName("bloc_friction");
coupler.addDumpFieldVector("displacement");
coupler.addDumpFieldVector("velocity");
coupler.addDumpFieldVector("normals");
coupler.addDumpFieldVector("tangents");
coupler.addDumpFieldVector("contact_force");
coupler.addDumpFieldVector("external_force");
coupler.addDumpFieldVector("internal_force");
coupler.addDumpField("areas");
coupler.addDumpField("stress");
coupler.addDumpField("blocked_dofs");
// Add the boundary conditions
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "XFixed");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _y), "YFixed");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "loading");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _y), "loading");
// Register velocity and gaps for future damping
auto &velocity = solid.getVelocity();
auto &gaps = contact.getGaps();
// Dump the initial state
coupler.dump();
// First loop : compression of the bloc against the wall
for (int s = 0; s < 10000; s++) {
solid.applyBC(BC::Dirichlet::IncrementValue(-1.0 / 10000, _y), "loading");
coupler.solveStep();
// damping velocities only along the contacting zone
for (auto &&tuple : zip(gaps, make_view(velocity, 2))) {
auto &gap = std::get<0>(tuple);
auto &vel = std::get<1>(tuple);
if (gap > 0) {
vel *= 0.99;
}
}
if (s % 100 == 0) {
std::cout << "Step " << s << "\t\r" << std::flush;
coupler.dump();
}
}
std::cout << "Compression done !" << std::endl;
// Second loop : sliding of the bloc against the wall
for (int s = 0; s < 10000; s++) {
solid.applyBC(BC::Dirichlet::IncrementValue(2.0 / 10000, _x), "loading");
coupler.solveStep();
// damping velocities only along the contacting zone
for (auto &&tuple : zip(gaps, make_view(velocity, 2))) {
auto &gap = std::get<0>(tuple);
auto &vel = std::get<1>(tuple);
if (gap > 0) {
vel *= 0.99;
}
}
if (s % 100 == 0) {
std::cout << "Step " << s << "\t\r" << std::flush;
coupler.dump();
}
}
std::cout << "Sliding done !" << std::endl;
// Third loop : stabilization of the system (no external force)
for (int s = 0; s < 10000; s++) {
coupler.solveStep();
// damping velocities only along the contacting zone
for (auto &&tuple : zip(gaps, make_view(velocity, 2))) {
auto &gap = std::get<0>(tuple);
auto &vel = std::get<1>(tuple);
if (gap > 0) {
vel *= 0.99;
}
}
if (s % 100 == 0) {
std::cout << "Step " << s << "\t\r" << std::flush;
coupler.dump();
}
}
return 0;
}

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