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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: Sun Jul 09 2017
			*
			* @brief test for material mazars, dissymmetric
			*
			* @section LICENSE
			*
			* Copyright (©) 2015-2018 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 "solid_mechanics_model.hh"
			#include "mesh_accessor.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)) \|\|
			(std::abs(sigma_max - 6.24e6) > 1e5) \|\|
			(std::abs(sigma_min + 2.943e7) > 1e6))
			return EXIT_FAILURE;
			energy.close();

			akantu::finalize();

			return EXIT_SUCCESS;
			}

rAKA/test/test_model/test_solid_mechanics_model/test_materials/test_material_mazars.ccf8a03d4d85b9features/python-doc

test_material_mazars.ccView Options

rAKA/test/test_model/test_solid_mechanics_model/test_materials/test_material_mazars.cc
f8a03d4d85b9features/python-doc

test_material_mazars.cc
View Options