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test_coupled_stiffness.cc
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Wed, May 1, 10:51

test_coupled_stiffness.cc
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/**
* @file test_coupled_stiffness.cc
*
* @author Mohit Pundir <mohit.pundir@epfl.ch>
*
* @date creation: Fri May 24 2019
* @date last modification: Wed Oct 02 2019
*
* @brief Test for contact mechanics model class
*
*
* @section LICENSE
*
* Copyright (©) 2018-2021 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 "sparse_matrix.hh"
#include "surface_selector.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
Real max_displacement = 0.01;
const UInt spatial_dimension = 2;
initialize("material_stiffness.dat", argc, argv);
Mesh mesh(spatial_dimension);
mesh.read("flat_on_flat.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);
solid.initFull(_analysis_method = _static);
contact.initFull(_analysis_method = _implicit_contact);
auto && surface_selector = std::make_shared<PhysicalSurfaceSelector>(mesh);
contact.getContactDetector().setSurfaceSelector(surface_selector);
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "bottom");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _y), "bottom");
solid.applyBC(BC::Dirichlet::IncrementValue(-max_displacement, _y), "top");
coupler.initFull(_analysis_method = _implicit_contact);
auto & solver = coupler.getNonLinearSolver();
solver.set("max_iterations", 1000);
solver.set("threshold", 1e-2);
solver.set("convergence_type", SolveConvergenceCriteria::_residual);
coupler.setBaseName("test-coupled-stiffness");
coupler.addDumpFieldVector("displacement");
coupler.addDumpFieldVector("normals");
coupler.addDumpFieldVector("contact_force");
coupler.addDumpFieldVector("external_force");
coupler.addDumpFieldVector("internal_force");
coupler.addDumpField("gaps");
coupler.addDumpField("blocked_dofs");
coupler.addDumpField("grad_u");
coupler.addDumpField("stress");
auto & before_assembly = const_cast<SparseMatrix &>(
coupler.getDOFManager().getNewMatrix("K", _symmetric));
solid.assembleStiffnessMatrix();
auto & solid_assembly =
const_cast<SparseMatrix &>(coupler.getDOFManager().getMatrix("K"));
solid_assembly.saveMatrix("solid_assembly.mtx");
auto & displacement = solid.getDisplacement();
contact.search(displacement);
contact.assembleStiffnessMatrix();
auto contact_map = contact.getContactMap();
auto nb_contacts = contact_map.size();
auto & contact_assembly =
const_cast<SparseMatrix &>(coupler.getDOFManager().getMatrix("K"));
contact_assembly.saveMatrix("contact_assembly.mtx");
solid.assembleInternalForces();
contact.assembleInternalForces();
coupler.dump();
Array<Real> & contact_force = contact.getInternalForce();
for (UInt n : arange(contact_force.size())) {
std::cerr << contact_force(n, 1) << std::endl;
}
if (solid_assembly.size() == contact_assembly.size() and nb_contacts > 0) {
std::cerr << "size of stiffness matrix of solid = "
<< solid_assembly.size() << std::endl;
std::cerr << "size of stiffness matrix of coupled = "
<< contact_assembly.size() << std::endl;
std::cerr << "number of contacts = " << nb_contacts << std::endl;
for (auto & pair : contact_map) {
std::cerr << "Node " << pair.first << " in contact with "
<< pair.second.master << " of gap " << pair.second.gap
<< std::endl;
}
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}

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