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test_material_linear_elastic2.cc
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test_material_linear_elastic2.cc
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/**
* @file test_material_linear_elastic2.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 04 Feb 2018
*
* @brief Tests for the objective Hooke's law with eigenstrains,
* (tests that do not require add_pixel are integrated into
* `test_material_linear_elastic1.cc`
*
* @section LICENSE
*
* Copyright © 2018 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <type_traits>
#include <boost/mpl/list.hpp>
#include <boost/range/combine.hpp>
#include "materials/material_linear_elastic2.hh"
#include "tests.hh"
#include "tests/test_goodies.hh"
#include "common/field_collection.hh"
#include "common/iterators.hh"
namespace muSpectre {
BOOST_AUTO_TEST_SUITE(material_linear_elastic_2);
template <class Mat_t>
struct MaterialFixture
{
using Mat = Mat_t;
constexpr static Real lambda{2}, mu{1.5};
constexpr static Real young{mu*(3*lambda + 2*mu)/(lambda + mu)};
constexpr static Real poisson{lambda/(2*(lambda + mu))};
MaterialFixture():mat("Name", young, poisson){};
constexpr static Dim_t sdim{Mat_t::sdim()};
constexpr static Dim_t mdim{Mat_t::mdim()};
Mat_t mat;
};
using mat_list = boost::mpl::list<
MaterialFixture<MaterialLinearElastic2<twoD, twoD>>,
MaterialFixture<MaterialLinearElastic2<twoD, threeD>>,
MaterialFixture<MaterialLinearElastic2<threeD, threeD>>>;
BOOST_FIXTURE_TEST_CASE_TEMPLATE(test_constructor, Fix, mat_list, Fix) {
BOOST_CHECK_EQUAL("Name", Fix::mat.get_name());
auto & mat{Fix::mat};
auto sdim{Fix::sdim};
auto mdim{Fix::mdim};
BOOST_CHECK_EQUAL(sdim, mat.sdim());
BOOST_CHECK_EQUAL(mdim, mat.mdim());
}
BOOST_FIXTURE_TEST_CASE_TEMPLATE(test_add_pixel, Fix, mat_list, Fix) {
auto & mat{Fix::mat};
constexpr Dim_t sdim{Fix::sdim};
testGoodies::RandRange<size_t> rng;;
const Dim_t nb_pixel{7}, box_size{17};
using Ccoord = Ccoord_t<sdim>;
for (Dim_t i = 0; i < nb_pixel; ++i) {
Ccoord c;
for (Dim_t j = 0; j < sdim; ++j) {
c[j] = rng.randval(0, box_size);
}
Eigen::Matrix<Real, Fix::mdim, Fix::mdim> Zero = Eigen::Matrix<Real, Fix::mdim, Fix::mdim>::Zero();
BOOST_CHECK_NO_THROW
(mat.add_pixel(c, Zero));
}
BOOST_CHECK_NO_THROW(mat.initialise());
}
BOOST_FIXTURE_TEST_CASE_TEMPLATE(test_eigenstrain_equivalence, Fix,
mat_list, Fix) {
auto & mat{Fix::mat};
const Dim_t nb_pixel{2};
constexpr auto cube{CcoordOps::get_cube<Fix::sdim>(nb_pixel)};
using Mat_t = Eigen::Matrix<Real, Fix::mdim, Fix::mdim>;
using FC_t = GlobalFieldCollection<Fix::sdim>;
FC_t globalfields;
auto & F_f{make_field<typename Fix::Mat::StrainField_t>
("Transformation Gradient", globalfields)};
auto & P1_f = make_field<typename Fix::Mat::StressField_t>
("Nominal Stress1", globalfields); // to be computed alone
auto & K_f = make_field<typename Fix::Mat::TangentField_t>
("Tangent Moduli", globalfields); // to be computed with tangent
globalfields.initialise(cube);
Mat_t zero{Mat_t::Zero()};
Mat_t F{Mat_t::Random()/100 + Mat_t::Identity()};
Mat_t strain{-.5*(F+F.transpose())-Mat_t::Identity()};
using Ccoord = Ccoord_t<Fix::sdim>;
Ccoord pix0{0};
Ccoord pix1{1};
mat.add_pixel(pix0, zero);
mat.add_pixel(pix1, strain);
mat.initialise();
F_f.get_map()[pix0] = -strain;
F_f.get_map()[pix1] = zero;
mat.compute_stresses_tangent(F_f, P1_f, K_f, Formulation::small_strain);
Real error{(P1_f.get_map()[pix0]-P1_f.get_map()[pix1]).norm()};
Real tol{1e-12};
if (error >= tol) {
std::cout << "error = " << error << " >= " << tol << " = tol" << std::endl;
std::cout << "P(0) =" << std::endl << P1_f.get_map()[pix0] << std::endl;
std::cout << "P(1) =" << std::endl << P1_f.get_map()[pix1] << std::endl;
}
BOOST_CHECK_LT(error, tol);
}
template <class Mat_t>
struct MaterialFixtureFilled:
public MaterialFixture<Mat_t>
{
using Par = MaterialFixture<Mat_t>;
using Mat = Mat_t;
constexpr static Dim_t box_size{3};
MaterialFixtureFilled():MaterialFixture<Mat_t>(){
using Ccoord = Ccoord_t<Mat_t::sdim()>;
Ccoord cube{CcoordOps::get_cube<Mat_t::sdim()>(box_size)};
CcoordOps::Pixels<Mat_t::sdim()> pixels(cube);
for (auto pixel: pixels) {
Eigen::Matrix<Real, Par::mdim, Par::mdim> Zero = Eigen::Matrix<Real, Par::mdim, Par::mdim>::Zero();
this->mat.add_pixel(pixel,
Zero);
}
this->mat.initialise();
};
};
using mat_fill = boost::mpl::list
<MaterialFixtureFilled<MaterialLinearElastic2<twoD, twoD>>,
MaterialFixtureFilled<MaterialLinearElastic2<twoD, threeD>>,
MaterialFixtureFilled<MaterialLinearElastic2<threeD, threeD>>>;
BOOST_FIXTURE_TEST_CASE_TEMPLATE(test_evaluate_law, Fix, mat_fill, Fix) {
constexpr auto cube{CcoordOps::get_cube<Fix::sdim>(Fix::box_size)};
auto & mat{Fix::mat};
using FC_t = GlobalFieldCollection<Fix::sdim>;
FC_t globalfields;
auto & F{make_field<typename Fix::Mat::StrainField_t>
("Transformation Gradient", globalfields)};
auto & P1 = make_field<typename Fix::Mat::StressField_t>
("Nominal Stress1", globalfields); // to be computed alone
auto & P2 = make_field<typename Fix::Mat::StressField_t>
("Nominal Stress2", globalfields); // to be computed with tangent
auto & K = make_field<typename Fix::Mat::TangentField_t>
("Tangent Moduli", globalfields); // to be computed with tangent
auto & Pr = make_field<typename Fix::Mat::StressField_t>
("Nominal Stress reference", globalfields);
auto & Kr = make_field<typename Fix::Mat::TangentField_t>
("Tangent Moduli reference", globalfields); // to be computed with tangent
globalfields.initialise(cube);
static_assert(std::is_same<decltype(P1),
typename Fix::Mat::StressField_t&>::value,
"oh oh");
static_assert(std::is_same<decltype(F),
typename Fix::Mat::StrainField_t&>::value,
"oh oh");
static_assert(std::is_same<decltype(P1), decltype(P2)&>::value,
"oh oh");
static_assert(std::is_same<decltype(K),
typename Fix::Mat::TangentField_t&>::value,
"oh oh");
static_assert(std::is_same<decltype(Pr), decltype(P1)&>::value,
"oh oh");
static_assert(std::is_same<decltype(Kr), decltype(K)&>::value,
"oh oh");
using traits = MaterialMuSpectre_traits<typename Fix::Mat>;
{ // block to contain not-constant gradient map
typename traits::StressMap_t grad_map
(globalfields["Transformation Gradient"]);
for (auto F_: grad_map) {
F_.setRandom();
}
grad_map[0] = grad_map[0].Identity(); // identifiable gradients for debug
grad_map[1] = 1.2*grad_map[1].Identity(); // ditto
}
//compute stresses using material
mat.compute_stresses(globalfields["Transformation Gradient"],
globalfields["Nominal Stress1"],
Formulation::finite_strain);
//compute stresses and tangent moduli using material
BOOST_CHECK_THROW
(mat.compute_stresses_tangent(globalfields["Transformation Gradient"],
globalfields["Nominal Stress2"],
globalfields["Nominal Stress2"],
Formulation::finite_strain),
std::runtime_error);
mat.compute_stresses_tangent(globalfields["Transformation Gradient"],
globalfields["Nominal Stress2"],
globalfields["Tangent Moduli"],
Formulation::finite_strain);
typename traits::StrainMap_t Fmap(globalfields["Transformation Gradient"]);
typename traits::StressMap_t Pmap_ref(globalfields["Nominal Stress reference"]);
typename traits::TangentMap_t Kmap_ref(globalfields["Tangent Moduli reference"]);
for (auto tup: akantu::zip(Fmap, Pmap_ref, Kmap_ref)) {
auto F_ = std::get<0>(tup);
auto P_ = std::get<1>(tup);
auto K_ = std::get<2>(tup);
std::tie(P_,K_) = testGoodies::objective_hooke_explicit<Fix::mdim>
(Fix::lambda, Fix::mu, F_);
}
typename traits::StressMap_t Pmap_1(globalfields["Nominal Stress1"]);
for (auto tup: akantu::zip(Pmap_ref, Pmap_1)) {
auto P_r = std::get<0>(tup);
auto P_1 = std::get<1>(tup);
Real error = (P_r - P_1).norm();
BOOST_CHECK_LT(error, tol);
}
typename traits::StressMap_t Pmap_2(globalfields["Nominal Stress2"]);
typename traits::TangentMap_t Kmap(globalfields["Tangent Moduli"]);
for (auto tup: akantu::zip(Pmap_ref, Pmap_2, Kmap_ref, Kmap)) {
auto P_r = std::get<0>(tup);
auto P = std::get<1>(tup);
Real error = (P_r - P).norm();
if (error >= tol) {
std::cout << "error = " << error << " >= " << tol << " = tol" << std::endl;
std::cout << "P(0) =" << std::endl << P_r << std::endl;
std::cout << "P(1) =" << std::endl << P << std::endl;
}
BOOST_CHECK_LT(error, tol);
auto K_r = std::get<2>(tup);
auto K = std::get<3>(tup);
error = (K_r - K).norm();
BOOST_CHECK_LT(error, tol);
}
}
BOOST_AUTO_TEST_SUITE_END();
} // muSpectre

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