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test_cohesive_fixture.hh
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			/**
			* @file test_cohesive_fixture.hh
			*
			* @author Nicolas Richart <nicolas.richart@epfl.ch>
			*
			* @date creation: Wed Jan 10 2018
			* @date last modification: Wed Nov 18 2020
			*
			* @brief Coehsive element test fixture
			*
			*
			* @section LICENSE
			*
			* Copyright (©) 2016-2021 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 "communicator.hh"
			#include "solid_mechanics_model_cohesive.hh"
			#include "test_gtest_utils.hh"
			/* -------------------------------------------------------------------------- */
			#include <gtest/gtest.h>
			#include <vector>
			/* -------------------------------------------------------------------------- */

			#ifndef AKANTU_TEST_COHESIVE_FIXTURE_HH_
			#define AKANTU_TEST_COHESIVE_FIXTURE_HH_

			using namespace akantu;

			template <::akantu::AnalysisMethod t>
			using analysis_method_t = std::integral_constant<::akantu::AnalysisMethod, t>;

			class StrainIncrement : public BC::Functor {
			public:
			StrainIncrement(const Matrix<Real> & strain, BC::Axis dir)
			: strain_inc(strain), dir(dir) {}

			void operator()(UInt /node/, Vector<bool> & flags, Vector<Real> & primal,
			const Vector<Real> & coord) const {
			if (std::abs(coord(dir)) < 1e-8) {
			return;
			}

			flags.set(true);
			primal += strain_inc * coord;
			}

			static const BC::Functor::Type type = BC::Functor::_dirichlet;

			private:
			Matrix<Real> strain_inc;
			BC::Axis dir;
			};

			template <typename param_> class TestSMMCFixture : public ::testing::Test {
			public:
			static constexpr ElementType cohesive_type =
			std::tuple_element_t<0, param_>::value;
			static constexpr ElementType type_1 = std::tuple_element_t<1, param_>::value;
			static constexpr ElementType type_2 = std::tuple_element_t<2, param_>::value;

			static constexpr size_t dim =
			ElementClass<cohesive_type>::getSpatialDimension();

			void SetUp() {
			mesh = std::make_unique<Mesh>(this->dim);
			if (Communicator::getStaticCommunicator().whoAmI() == 0) {
			mesh->read(this->mesh_name);
			}
			mesh->distribute();
			}

			void TearDown() {
			model.reset(nullptr);
			mesh.reset(nullptr);
			}

			void createModel() {
			model = std::make_unique<SolidMechanicsModelCohesive>(*mesh);
			model->initFull(_analysis_method = this->analysis_method,
			_is_extrinsic = this->is_extrinsic);

			auto time_step = this->model->getStableTimeStep() * 0.01;
			this->model->setTimeStep(time_step);

			if (dim == 1) {
			surface = 1;
			group_size = 1;
			return;
			}

			auto facet_type = mesh->getFacetType(this->cohesive_type);

			auto & fe_engine = model->getFEEngineBoundary();
			const auto & group = mesh->getElementGroup("insertion");
			group_size = group.size(_ghost_type = _not_ghost);
			const auto & elements = group.getElements(facet_type);
			Array<Real> ones(fe_engine.getNbIntegrationPoints(facet_type) * group_size);
			ones.set(1.);

			surface = fe_engine.integrate(ones, facet_type, _not_ghost, elements);
			mesh->getCommunicator().allReduce(surface, SynchronizerOperation::_sum);

			mesh->getCommunicator().allReduce(group_size, SynchronizerOperation::_sum);

			#define debug_ 0

			#if debug_
			this->model->addDumpFieldVector("displacement");
			this->model->addDumpFieldVector("velocity");
			this->model->addDumpFieldVector("internal_force");
			this->model->addDumpFieldVector("external_force");
			this->model->addDumpField("blocked_dofs");
			this->model->addDumpField("stress");
			this->model->addDumpField("strain");
			this->model->assembleInternalForces();
			this->model->setBaseNameToDumper("cohesive elements", "cohesive_elements");
			this->model->addDumpFieldVectorToDumper("cohesive elements",
			"displacement");
			this->model->addDumpFieldToDumper("cohesive elements", "damage");
			this->model->addDumpFieldToDumper("cohesive elements", "tractions");
			this->model->addDumpFieldToDumper("cohesive elements", "opening");
			this->model->dump();
			this->model->dump("cohesive elements");
			#endif
			}

			void setInitialCondition(const Matrix<Real> & strain) {
			for (auto && data :
			zip(make_view(this->mesh->getNodes(), this->dim),
			make_view(this->model->getDisplacement(), this->dim))) {
			const auto & pos = std::get<0>(data);
			auto & disp = std::get<1>(data);
			disp = strain * pos;
			}
			}

			bool checkDamaged() {
			UInt nb_damaged = 0;
			auto & damage =
			model->getMaterial("insertion").getArray<Real>("damage", cohesive_type);
			for (auto d : damage) {
			if (d >= .99) {
			++nb_damaged;
			}
			}

			return (nb_damaged == group_size);
			}

			void steps(const Matrix<Real> & strain) {
			StrainIncrement functor((1. / 300) * strain, this->dim == 1 ? _x : _y);

			for (auto _ [[gnu::unused]] : arange(nb_steps)) {
			this->model->applyBC(functor, "loading");
			this->model->applyBC(functor, "fixed");
			if (this->is_extrinsic) {
			this->model->checkCohesiveStress();
			}

			this->model->solveStep();
			#if debug_
			this->model->dump();
			this->model->dump("cohesive elements");
			#endif
			}
			}

			void checkInsertion() {
			auto nb_cohesive_element = this->mesh->getNbElement(cohesive_type);
			mesh->getCommunicator().allReduce(nb_cohesive_element,
			SynchronizerOperation::_sum);

			EXPECT_EQ(nb_cohesive_element, group_size);
			}

			void checkDissipated(Real expected_density) {
			Real edis = this->model->getEnergy("dissipated");

			EXPECT_NEAR(this->surface * expected_density, edis, 5e-1);
			}

			void testModeI() {
			this->createModel();

			auto & mat_el = this->model->getMaterial("body");

			auto speed = mat_el.getPushWaveSpeed(Element());
			auto direction = _y;
			if (dim == 1) {
			direction = _x;
			}
			auto length =
			mesh->getUpperBounds()(direction) - mesh->getLowerBounds()(direction);
			nb_steps = length / speed / model->getTimeStep();

			SCOPED_TRACE(std::to_string(this->dim) + "D - " + std::to_string(type_1) +
			":" + std::to_string(type_2));

			auto & mat_co = this->model->getMaterial("insertion");
			Real sigma_c = mat_co.get("sigma_c");

			Real E = mat_el.get("E");
			Real nu = mat_el.get("nu");

			Matrix<Real> strain;
			if (dim == 1) {
			strain = {{1.}};
			} else if (dim == 2) {
			strain = {{-nu, 0.}, {0., 1. - nu}};
			strain *= (1. + nu);
			} else if (dim == 3) {
			strain = {{-nu, 0., 0.}, {0., 1., 0.}, {0., 0., -nu}};
			}

			strain *= sigma_c / E;

			this->setInitialCondition((1 - 1e-5) * strain);
			this->steps(2e-2 * strain);
			}

			void testModeII() {
			this->createModel();
			auto & mat_el = this->model->getMaterial("body");
			Real speed;
			try {
			speed =
			mat_el.getShearWaveSpeed(Element()); // the slowest speed if exists
			} catch (...) {
			speed = mat_el.getPushWaveSpeed(Element());
			}

			auto direction = _y;
			if (dim == 1)
			direction = _x;
			auto length =
			mesh->getUpperBounds()(direction) - mesh->getLowerBounds()(direction);
			nb_steps = 2 * length / 2. / speed / model->getTimeStep();

			SCOPED_TRACE(std::to_string(this->dim) + "D - " + std::to_string(type_1) +
			":" + std::to_string(type_2));

			if (this->dim > 1)
			this->model->applyBC(BC::Dirichlet::FlagOnly(_y), "sides");
			if (this->dim > 2)
			this->model->applyBC(BC::Dirichlet::FlagOnly(_z), "sides");

			auto & mat_co = this->model->getMaterial("insertion");
			Real sigma_c = mat_co.get("sigma_c");
			Real beta = mat_co.get("beta");
			// Real G_c = mat_co.get("G_c");

			Real E = mat_el.get("E");
			Real nu = mat_el.get("nu");

			Matrix<Real> strain;
			if (dim == 1) {
			strain = {{1.}};
			} else if (dim == 2) {
			strain = {{0., 1.}, {0., 0.}};
			strain *= (1. + nu);
			} else if (dim == 3) {
			strain = {{0., 1., 0.}, {0., 0., 0.}, {0., 0., 0.}};
			strain *= (1. + nu);
			}
			strain = 2 beta * beta * sigma_c / E;

			// nb_steps *= 5;

			this->setInitialCondition((1. - 1e-5) * strain);
			this->steps(0.005 * strain);
			}

			protected:
			std::unique_ptr<Mesh> mesh;
			std::unique_ptr<SolidMechanicsModelCohesive> model;

			std::string mesh_name{std::to_string(cohesive_type) + std::to_string(type_1) +
			(type_1 == type_2 ? "" : std::to_string(type_2)) +
			".msh"};

			bool is_extrinsic;
			AnalysisMethod analysis_method;

			Real surface{0};
			UInt nb_steps{1000};
			UInt group_size{10000};
			};

			/* -------------------------------------------------------------------------- */
			template <typename param_>
			constexpr ElementType TestSMMCFixture<param_>::cohesive_type;
			template <typename param_>
			constexpr ElementType TestSMMCFixture<param_>::type_1;
			template <typename param_>
			constexpr ElementType TestSMMCFixture<param_>::type_2;

			template <typename param_> constexpr size_t TestSMMCFixture<param_>::dim;
			/* -------------------------------------------------------------------------- */

			using IsExtrinsicTypes = std::tuple<std::true_type, std::false_type>;
			using AnalysisMethodTypes =
			std::tuple<analysis_method_t<_explicit_lumped_mass>>;

			using coh_types = gtest_list_t<std::tuple<
			std::tuple<_element_type_cohesive_1d_2, _element_type_segment_2,
			_element_type_segment_2>,
			std::tuple<_element_type_cohesive_2d_4, _element_type_triangle_3,
			_element_type_triangle_3>,
			std::tuple<_element_type_cohesive_2d_4, _element_type_quadrangle_4,
			_element_type_quadrangle_4>,
			std::tuple<_element_type_cohesive_2d_4, _element_type_triangle_3,
			_element_type_quadrangle_4>,
			std::tuple<_element_type_cohesive_2d_6, _element_type_triangle_6,
			_element_type_triangle_6>,
			std::tuple<_element_type_cohesive_2d_6, _element_type_quadrangle_8,
			_element_type_quadrangle_8>,
			std::tuple<_element_type_cohesive_2d_6, _element_type_triangle_6,
			_element_type_quadrangle_8>,
			std::tuple<_element_type_cohesive_3d_6, _element_type_tetrahedron_4,
			_element_type_tetrahedron_4>,
			std::tuple<_element_type_cohesive_3d_12, _element_type_tetrahedron_10,
			_element_type_tetrahedron_10> /*,
			std::tuple<_element_type_cohesive_3d_8, _element_type_hexahedron_8,
			_element_type_hexahedron_8>,
			std::tuple<_element_type_cohesive_3d_16, _element_type_hexahedron_20,
			_element_type_hexahedron_20>*/>>;

			TYPED_TEST_SUITE(TestSMMCFixture, coh_types, );

			#endif /* AKANTU_TEST_COHESIVE_FIXTURE_HH_ */

rAKA/test/test_model/test_solid_mechanics_model/test_cohesive/test_cohesive_fixture.hhe5cfe0ce664afeatures/quad_point_syn…

test_cohesive_fixture.hhView Options

rAKA/test/test_model/test_solid_mechanics_model/test_cohesive/test_cohesive_fixture.hh
e5cfe0ce664afeatures/quad_point_syn…

test_cohesive_fixture.hh
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