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rAKA/test/test_model/test_solid_mechanics_model/test_materials/test_material_mazars.cc
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test_material_mazars.cc
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/**
* @file tes_material_mazars.cc
* @author Clement Roux-Langlois <clement.roux@epfl.ch>
* @date Fri Sep 11 20151
*
* @brief test for material mazars, dissymmetric
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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 "aka_common.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "solid_mechanics_model.hh"
#include "material.hh"
//#include "io_helper_tools.hh"
/* -------------------------------------------------------------------------- */
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;
// UInt compression_steps = 5e5;
// Real max_compression = 0.01;
// UInt traction_steps = 1e4;
// Real max_traction = 0.001;
Mesh mesh(spatial_dimension);
mesh.addConnectivityType(type);
Array<Real> & nodes = const_cast<Array<Real> &>(mesh.getNodes());
Array<UInt> & connectivity = const_cast<Array<UInt> &>(mesh.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;
}
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;
}
// boun(0,1) = true;
// boun(1,1) = true;
// boun(2,1) = true;
// boun(0,2) = true;
// boun(1,2) = true;
// boun(2,2) = true;
// disp(1,0) = 0;
// forc(1,0) = atof(argv[2]);
// velo(0,0) = -atof(argv[2]);
// velo(1,0) = atof(argv[2]);
model.assembleMassLumped();
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);
model.updateResidual();
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.explicitPred();
model.updateResidual();
model.updateAcceleration();
model.explicitCorr();
Real epot = model.getEnergy("potential");
Real ekin = model.getEnergy("kinetic");
Real edis = model.getEnergy("dissipated");
wext += model.getEnergy("external work");
/*for (UInt i = 0; i < nb_dof; ++i) {
wext += boun(i,0) * forc(i,0) * velo(i,0) * time_step;
}*/
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( (abs(sigma_max)>abs(sigma_min)) || (abs(sigma_max-6.24e6)>1e5)
|| (abs(sigma_min+2.943e7)>1e6) )
return EXIT_FAILURE;
energy.close();
akantu::finalize();
return EXIT_SUCCESS;
}
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