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test_structural_mechanics_model_bernoulli_beam_3.cc
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test_structural_mechanics_model_bernoulli_beam_3.cc
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/**
* @file test_structural_mechanics_model_bernoulli_beam_3.cc
*
* @author Lucas Frerot <lucas.frerot@epfl.ch>
*
* @date creation: Sun Oct 19 2014
* @date last modification: Thu Feb 25 2021
*
* @brief Computation of the analytical exemple 1.1 in the TGC vol 6
*
*
* @section LICENSE
*
* Copyright (©) 2010-2021 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 "test_structural_mechanics_model_fixture.hh"
/* -------------------------------------------------------------------------- */
#include <gtest/gtest.h>
/* -------------------------------------------------------------------------- */
using namespace akantu;
class TestStructBernoulli3Static
: public TestStructuralFixture<element_type_t<_bernoulli_beam_3>> {
using parent = TestStructuralFixture<element_type_t<_bernoulli_beam_3>>;
public:
void readMesh(std::string filename) override { parent::readMesh(filename); }
void setNormals() override {
auto & normals = this->mesh->getData<Real>("extra_normal", parent::type);
normals(0, _z) = 1;
normals(1, _z) = 1;
}
void addMaterials() override {
StructuralMaterial mat;
mat.E = 1;
mat.Iz = 1;
mat.Iy = 1;
mat.A = 1;
mat.GJ = 1;
this->model->addMaterial(mat);
}
void setDirichletBCs() override {
// Boundary conditions (blocking all DOFs of nodes 2 & 3)
auto boundary = ++this->model->getBlockedDOFs().begin(parent::ndof);
// clang-format off
*boundary = Vector<bool>{true, true, true, true, true, true}; ++boundary;
*boundary = Vector<bool>{true, true, true, true, true, true}; ++boundary;
// clang-format on
}
void setNeumannBCs() override {
// Forces
Real P = 1; // N
auto & forces = this->model->getExternalForce();
forces.zero();
forces(0, 2) = -P; // vertical force on first node
}
void assignMaterials() override {
model->getElementMaterial(parent::type).set(0);
}
};
/* -------------------------------------------------------------------------- */
TEST_F(TestStructBernoulli3Static, TestDisplacements) {
model->solveStep();
auto vz = model->getDisplacement()(0, 2);
auto thy = model->getDisplacement()(0, 4);
auto thx = model->getDisplacement()(0, 3);
auto thz = model->getDisplacement()(0, 5);
Real tol = Math::getTolerance();
EXPECT_NEAR(vz, -5. / 48, tol);
EXPECT_NEAR(thy, -std::sqrt(2) / 8, tol);
EXPECT_NEAR(thz, 0, tol);
EXPECT_NEAR(thx, 0, tol);
}

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