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test_material_mazars.cc
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test_material_mazars.cc
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/**
* @file test_material_mazars.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Clement Roux <clement.roux@epfl.ch>
*
* @date creation: Thu Oct 08 2015
* @date last modification: Wed Jun 05 2019
*
* @brief test for material mazars, dissymmetric
*
*
* @section LICENSE
*
* Copyright (©) 2015-2021 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 "mesh_accessor.hh"
#include "solid_mechanics_model.hh"
/* -------------------------------------------------------------------------- */
#include <fstream>
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
debug::setDebugLevel(akantu::dblWarning);
akantu::initialize("material_mazars.dat", argc, argv);
const UInt spatial_dimension = 3;
// ElementType type = _quadrangle_4;
ElementType type = _hexahedron_8;
Mesh mesh(spatial_dimension);
MeshAccessor mesh_accessor(mesh);
Array<Real> & nodes = mesh_accessor.getNodes();
Array<UInt> & connectivity = mesh_accessor.getConnectivity(type);
const Real width = 1;
UInt nb_dof = 0;
connectivity.resize(1);
if (type == _hexahedron_8) {
nb_dof = 8;
nodes.resize(nb_dof);
nodes(0, 0) = 0.;
nodes(0, 1) = 0.;
nodes(0, 2) = 0.;
nodes(1, 0) = width;
nodes(1, 1) = 0.;
nodes(1, 2) = 0.;
nodes(2, 0) = width;
nodes(2, 1) = width;
nodes(2, 2) = 0;
nodes(3, 0) = 0;
nodes(3, 1) = width;
nodes(3, 2) = 0;
nodes(4, 0) = 0.;
nodes(4, 1) = 0.;
nodes(4, 2) = width;
nodes(5, 0) = width;
nodes(5, 1) = 0.;
nodes(5, 2) = width;
nodes(6, 0) = width;
nodes(6, 1) = width;
nodes(6, 2) = width;
nodes(7, 0) = 0;
nodes(7, 1) = width;
nodes(7, 2) = width;
connectivity(0, 0) = 0;
connectivity(0, 1) = 1;
connectivity(0, 2) = 2;
connectivity(0, 3) = 3;
connectivity(0, 4) = 4;
connectivity(0, 5) = 5;
connectivity(0, 6) = 6;
connectivity(0, 7) = 7;
} else if (type == _quadrangle_4) {
nb_dof = 4;
nodes.resize(nb_dof);
nodes(0, 0) = 0.;
nodes(0, 1) = 0.;
nodes(1, 0) = width;
nodes(1, 1) = 0;
nodes(2, 0) = width;
nodes(2, 1) = width;
nodes(3, 0) = 0.;
nodes(3, 1) = width;
connectivity(0, 0) = 0;
connectivity(0, 1) = 1;
connectivity(0, 2) = 2;
connectivity(0, 3) = 3;
}
mesh_accessor.makeReady();
SolidMechanicsModel model(mesh);
model.initFull();
Material & mat = model.getMaterial(0);
std::cout << mat << std::endl;
/// boundary conditions
Array<Real> & disp = model.getDisplacement();
Array<Real> & velo = model.getVelocity();
Array<bool> & boun = model.getBlockedDOFs();
for (UInt i = 0; i < nb_dof; ++i) {
boun(i, 0) = true;
}
Real time_step = model.getStableTimeStep() * .5;
// Real time_step = 1e-5;
std::cout << "Time Step = " << time_step
<< "s - nb elements : " << mesh.getNbElement(type) << std::endl;
model.setTimeStep(time_step);
std::ofstream energy;
energy.open("energies_and_scalar_mazars.csv");
energy << "id,rtime,epot,ekin,u,wext,kin+pot,D,strain_xx,strain_yy,stress_xx,"
"stress_yy,edis,tot"
<< std::endl;
/// Set dumper
model.setBaseName("uniaxial_comp-trac_mazars");
model.addDumpFieldVector("displacement");
model.addDumpField("velocity");
model.addDumpField("acceleration");
model.addDumpField("damage");
model.addDumpField("strain");
model.addDumpField("stress");
model.addDumpField("partitions");
model.dump();
const Array<Real> & strain = mat.getGradU(type);
const Array<Real> & stress = mat.getStress(type);
const Array<Real> & damage = mat.getArray<Real>("damage", type);
/* ------------------------------------------------------------------------ */
/* Main loop */
/* ------------------------------------------------------------------------ */
Real wext = 0.;
Real sigma_max = 0, sigma_min = 0;
Real max_disp;
Real stress_xx_compression_1;
UInt nb_steps = 7e5 / 150;
Real adisp = 0;
for (UInt s = 0; s < nb_steps; ++s) {
if (s == 0) {
max_disp = 0.003;
adisp = -(max_disp * 8. / nb_steps) / 2.;
std::cout << "Step " << s << " compression: " << max_disp << std::endl;
}
if (s == (2 * nb_steps / 8)) {
stress_xx_compression_1 = stress(0, 0);
max_disp = 0 + max_disp;
adisp = max_disp * 8. / nb_steps;
std::cout << "Step " << s << " discharge" << std::endl;
}
if (s == (3 * nb_steps / 8)) {
max_disp = 0.004;
adisp = -max_disp * 8. / nb_steps;
std::cout << "Step " << s << " compression: " << max_disp << std::endl;
}
if (s == (4 * nb_steps / 8)) {
if (stress(0, 0) < stress_xx_compression_1) {
std::cout << "after this second compression step softening should have "
"started"
<< std::endl;
return EXIT_FAILURE;
}
max_disp = 0.0015 + max_disp;
adisp = max_disp * 8. / nb_steps;
std::cout << "Step " << s << " discharge tension: " << max_disp
<< std::endl;
}
if (s == (5 * nb_steps / 8)) {
max_disp = 0. + 0.0005;
adisp = -max_disp * 8. / nb_steps;
std::cout << "Step " << s << " discharge" << std::endl;
}
if (s == (6 * nb_steps / 8)) {
max_disp = 0.0035 - 0.001;
adisp = max_disp * 8. / nb_steps;
std::cout << "Step " << s << " tension: " << max_disp << std::endl;
}
if (s == (7 * nb_steps / 8)) {
// max_disp = max_disp;
adisp = -max_disp * 8. / nb_steps;
std::cout << "Step " << s << " discharge" << std::endl;
}
for (UInt i = 0; i < nb_dof; ++i) {
if (std::abs(nodes(i, 0) - width) <
std::numeric_limits<Real>::epsilon()) {
disp(i, 0) += adisp;
velo(i, 0) = adisp / time_step;
}
}
std::cout << "S: " << s << "/" << nb_steps << " inc disp: " << adisp
<< " disp: " << std::setw(5) << disp(2, 0) << "\r" << std::flush;
model.solveStep();
Real epot = model.getEnergy("potential");
Real ekin = model.getEnergy("kinetic");
Real edis = model.getEnergy("dissipated");
wext += model.getEnergy("external work");
sigma_max = std::max(sigma_max, stress(0, 0));
sigma_min = std::min(sigma_min, stress(0, 0));
if (s % 10 == 0)
energy << s << "," // 1
<< s * time_step << "," // 2
<< epot << "," // 3
<< ekin << "," // 4
<< disp(2, 0) << "," // 5
<< wext << "," // 6
<< epot + ekin << "," // 7
<< damage(0) << "," // 8
<< strain(0, 0) << "," // 9
<< strain(0, 3) << "," // 11
<< stress(0, 0) << "," // 10
<< stress(0, 3) << "," // 10
<< edis << "," // 12
<< epot + ekin + edis // 13
<< std::endl;
if (s % 100 == 0)
model.dump();
}
std::cout << std::endl
<< "sigma_max = " << sigma_max << ", sigma_min = " << sigma_min
<< std::endl;
/// Verif the maximal/minimal stress values
if ((std::abs(sigma_max) > std::abs(sigma_min)) or
(std::abs(sigma_max - 6.24e6) > 1e5) or
(std::abs(sigma_min + 2.943e7) > 1e6))
return EXIT_FAILURE;
energy.close();
akantu::finalize();
return EXIT_SUCCESS;
}

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