Homec4science
Diffusion µSpectre (18_update_pfft) Browse

muSpectre/tests/test_material_hyper_elasto_plastic1.cc
d10e89d0559c18_update_pfft

Last Change
Raw File

test_material_hyper_elasto_plastic1.cc
View Options

/**
* @file test_material_hyper_elasto_plastic1.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 25 Feb 2018
*
* @brief Tests for the large-strain Simo-type plastic law implemented
* using MaterialMuSpectre
*
* 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 "boost/mpl/list.hpp"
#include "materials/material_hyper_elasto_plastic1.hh"
#include "materials/materials_toolbox.hh"
#include "tests.hh"
namespace muSpectre {
BOOST_AUTO_TEST_SUITE(material_hyper_elasto_plastic_1);
template <class Mat_t>
struct MaterialFixture
{
using Mat = Mat_t;
constexpr static Real K{.833}; // bulk modulus
constexpr static Real mu{.386}; // shear modulus
constexpr static Real H{.004}; // hardening modulus
constexpr static Real tau_y0{.003}; // initial yield stress
constexpr static Real young{
MatTB::convert_elastic_modulus<ElasticModulus::Young,
ElasticModulus::Bulk,
ElasticModulus::Shear>(K, mu)};
constexpr static Real poisson{
MatTB::convert_elastic_modulus<ElasticModulus::Poisson,
ElasticModulus::Bulk,
ElasticModulus::Shear>(K, mu)};
MaterialFixture():mat("Name", young, poisson, tau_y0, H){};
constexpr static Dim_t sdim{Mat_t::sdim()};
constexpr static Dim_t mdim{Mat_t::mdim()};
Mat_t mat;
};
using mats = boost::mpl::list<MaterialFixture<MaterialHyperElastoPlastic1< twoD, twoD>>,
MaterialFixture<MaterialHyperElastoPlastic1< twoD, threeD>>,
MaterialFixture<MaterialHyperElastoPlastic1<threeD, threeD>>>;
BOOST_FIXTURE_TEST_CASE_TEMPLATE(test_constructor, Fix, mats, 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_evaluate_stress, Fix, mats, Fix) {
// This test uses precomputed reference values (computed using
// elasto-plasticity.py) for the 3d case only
// need higher tol because of printout precision of reference solutions
constexpr Real hi_tol{1e-8};
constexpr Dim_t mdim{Fix::mdim}, sdim{Fix::sdim};
constexpr bool has_precomputed_values{(mdim == sdim) && (mdim == threeD)};
constexpr bool verbose{false};
using Strain_t = Eigen::Matrix<Real, mdim, mdim>;
using traits = MaterialMuSpectre_traits<MaterialHyperElastoPlastic1<sdim, mdim>>;
using LColl_t = typename traits::LFieldColl_t;
using StrainStField_t = StateField<
TensorField<LColl_t, Real, secondOrder, mdim>>;
using FlowStField_t = StateField<
ScalarField<LColl_t, Real>>;
// using StrainStRef_t = typename traits::LStrainMap_t::reference;
// using ScalarStRef_t = typename traits::LScalarMap_t::reference;
// create statefields
LColl_t coll{};
coll.add_pixel({0});
coll.initialise();
StrainStField_t F_("previous gradient", coll);
StrainStField_t be_("previous elastic strain", coll);
FlowStField_t eps_("plastic flow", coll);
auto F_prev{F_.get_map()};
F_prev[0].current() = Strain_t::Identity();
auto be_prev{be_.get_map()};
be_prev[0].current() = Strain_t::Identity();
auto eps_prev{eps_.get_map()};
eps_prev[0].current() = 0;
// elastic deformation
Strain_t F{Strain_t::Identity()};
F(0, 1) = 1e-5;
F_.cycle();
be_.cycle();
eps_.cycle();
Strain_t stress{Fix::mat.evaluate_stress(F,
F_prev[0],
be_prev[0],
eps_prev[0])};
if (has_precomputed_values) {
Strain_t tau_ref{};
tau_ref <<
1.92999522e-11, 3.86000000e-06, 0.00000000e+00,
3.86000000e-06, -1.93000510e-11, 0.00000000e+00,
0.00000000e+00, 0.00000000e+00, -2.95741950e-17;
Real error{(tau_ref-stress).norm()};
BOOST_CHECK_LT(error, hi_tol);
Strain_t be_ref{};
be_ref <<
1.00000000e+00, 1.00000000e-05, 0.00000000e+00,
1.00000000e-05, 1.00000000e+00, 0.00000000e+00,
0.00000000e+00, 0.00000000e+00, 1.00000000e+00;
error = (be_ref-be_prev[0].current()).norm();
BOOST_CHECK_LT(error, hi_tol);
Real ep_ref{0};
error = ep_ref-eps_prev[0].current();
BOOST_CHECK_LT(error, hi_tol);
}
if (verbose) {
std::cout << "τ =" << std::endl << stress << std::endl;
std::cout << "F =" << std::endl << F << std::endl;
std::cout << "Fₜ =" << std::endl << F_prev[0].current() << std::endl;
std::cout << "bₑ =" << std::endl << be_prev[0].current() << std::endl;
std::cout << "εₚ =" << std::endl << eps_prev[0].current() << std::endl;
}
F_.cycle();
be_.cycle();
eps_.cycle();
// plastic deformation
F(0, 1) = .2;
stress = Fix::mat.evaluate_stress(F,
F_prev[0],
be_prev[0],
eps_prev[0]);
if (has_precomputed_values) {
Strain_t tau_ref{};
tau_ref <<
1.98151335e-04, 1.98151335e-03, 0.00000000e+00,
1.98151335e-03, -1.98151335e-04, 0.00000000e+00,
0.00000000e+00, 0.00000000e+00, 1.60615155e-16;
Real error{(tau_ref-stress).norm()};
BOOST_CHECK_LT(error, hi_tol);
Strain_t be_ref{};
be_ref <<
1.00052666, 0.00513348, 0.,
0.00513348, 0.99949996, 0.,
0., 0., 1.;
error = (be_ref-be_prev[0].current()).norm();
BOOST_CHECK_LT(error, hi_tol);
Real ep_ref{0.11229988};
error = ep_ref-eps_prev[0].current();
BOOST_CHECK_LT(error, hi_tol);
}
if (verbose) {
std::cout << "Post Cycle" << std::endl;
std::cout << "τ =" << std::endl << stress << std::endl
<< "F =" << std::endl << F << std::endl
<< "Fₜ =" << std::endl << F_prev[0].current() << std::endl
<< "bₑ =" << std::endl << be_prev[0].current() << std::endl
<< "εₚ =" << std::endl << eps_prev[0].current() << std::endl;
}
}
BOOST_FIXTURE_TEST_CASE_TEMPLATE(test_evaluate_stiffness, Fix, mats, Fix) {
// This test uses precomputed reference values (computed using
// elasto-plasticity.py) for the 3d case only
// need higher tol because of printout precision of reference solutions
constexpr Real hi_tol{1e-8};
constexpr Dim_t mdim{Fix::mdim}, sdim{Fix::sdim};
constexpr bool has_precomputed_values{(mdim == sdim) && (mdim == threeD)};
constexpr bool verbose{has_precomputed_values && false};
using Strain_t = Eigen::Matrix<Real, mdim, mdim>;
using Stiffness_t = T4Mat<Real, mdim>;
using traits = MaterialMuSpectre_traits<MaterialHyperElastoPlastic1<sdim, mdim>>;
using LColl_t = typename traits::LFieldColl_t;
using StrainStField_t = StateField<
TensorField<LColl_t, Real, secondOrder, mdim>>;
using FlowStField_t = StateField<
ScalarField<LColl_t, Real>>;
// using StrainStRef_t = typename traits::LStrainMap_t::reference;
// using ScalarStRef_t = typename traits::LScalarMap_t::reference;
// create statefields
LColl_t coll{};
coll.add_pixel({0});
coll.initialise();
StrainStField_t F_("previous gradient", coll);
StrainStField_t be_("previous elastic strain", coll);
FlowStField_t eps_("plastic flow", coll);
auto F_prev{F_.get_map()};
F_prev[0].current() = Strain_t::Identity();
auto be_prev{be_.get_map()};
be_prev[0].current() = Strain_t::Identity();
auto eps_prev{eps_.get_map()};
eps_prev[0].current() = 0;
// elastic deformation
Strain_t F{Strain_t::Identity()};
F(0, 1) = 1e-5;
F_.cycle();
be_.cycle();
eps_.cycle();
Strain_t stress{};
Stiffness_t stiffness{};
std::tie(stress, stiffness) =
Fix::mat.evaluate_stress_tangent(F,
F_prev[0],
be_prev[0],
eps_prev[0]);
if (has_precomputed_values) {
Strain_t tau_ref{};
tau_ref <<
1.92999522e-11, 3.86000000e-06, 0.00000000e+00,
3.86000000e-06, -1.93000510e-11, 0.00000000e+00,
0.00000000e+00, 0.00000000e+00, -2.95741950e-17;
Real error{(tau_ref-stress).norm()};
BOOST_CHECK_LT(error, hi_tol);
Strain_t be_ref{};
be_ref <<
1.00000000e+00, 1.00000000e-05, 0.00000000e+00,
1.00000000e-05, 1.00000000e+00, 0.00000000e+00,
0.00000000e+00, 0.00000000e+00, 1.00000000e+00;
error = (be_ref-be_prev[0].current()).norm();
BOOST_CHECK_LT(error, hi_tol);
Real ep_ref{0};
error = ep_ref-eps_prev[0].current();
BOOST_CHECK_LT(error, hi_tol);
Stiffness_t C4_ref{};
C4_ref <<
0.67383333, 0., 0., 0., 0.28783333, 0., 0., 0., 0.28783333,
0., 0.193, 0., 0.193, 0., 0., 0., 0., 0.,
0., 0., 0.193, 0., 0., 0., 0.193, 0., 0.,
0., 0.193, 0., 0.193, 0., 0., 0., 0., 0.,
0.28783333, 0., 0., 0., 0.67383333, 0., 0., 0., 0.28783333,
0., 0., 0., 0., 0., 0.193, 0., 0.193, 0.,
0., 0., 0.193, 0., 0., 0., 0.193, 0., 0.,
0., 0., 0., 0., 0., 0.193, 0., 0.193, 0.,
0.28783333, 0., 0., 0., 0.28783333, 0., 0., 0., 0.67383333;
error = (C4_ref - stiffness).norm();
BOOST_CHECK_LT(error, hi_tol);
}
if (verbose) {
std::cout << "C₄ =" << std::endl << stiffness << std::endl;
}
F_.cycle();
be_.cycle();
eps_.cycle();
// plastic deformation
F(0, 1) = .2;
std::tie(stress, stiffness) =
Fix::mat.evaluate_stress_tangent(F,
F_prev[0],
be_prev[0],
eps_prev[0]);
if (has_precomputed_values) {
Strain_t tau_ref{};
tau_ref <<
1.98151335e-04, 1.98151335e-03, 0.00000000e+00,
1.98151335e-03, -1.98151335e-04, 0.00000000e+00,
0.00000000e+00, 0.00000000e+00, 1.60615155e-16;
Real error{(tau_ref-stress).norm()};
BOOST_CHECK_LT(error, hi_tol);
Strain_t be_ref{};
be_ref <<
1.00052666, 0.00513348, 0.,
0.00513348, 0.99949996, 0.,
0., 0., 1.;
error = (be_ref-be_prev[0].current()).norm();
BOOST_CHECK_LT(error, hi_tol);
Real ep_ref{0.11229988};
error = ep_ref-eps_prev[0].current();
BOOST_CHECK_LT(error, hi_tol);
Stiffness_t C4_ref{};
C4_ref <<
+4.23106224e-01, -4.27959704e-04, 0.00000000e+00, -4.27959704e-04, 4.13218286e-01, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 4.13175490e-01,
-4.27959704e-04, 7.07167743e-04, 0.00000000e+00, 7.07167743e-04, 4.27959704e-04, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 2.79121029e-18,
+0.00000000e+00, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00, 0.00000000e+00,
-4.27959704e-04, 7.07167743e-04, 0.00000000e+00, 7.07167743e-04, 4.27959704e-04, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 2.79121029e-18,
+4.13218286e-01, 4.27959704e-04, 0.00000000e+00, 4.27959704e-04, 4.23106224e-01, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 4.13175490e-01,
+0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00,
+0.00000000e+00, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00, 0.00000000e+00,
+0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00, 4.98676478e-03, 0.00000000e+00,
+4.13175490e-01, 2.79121029e-18, 0.00000000e+00, 2.79121029e-18, 4.13175490e-01, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 4.23149020e-01;
error = (C4_ref - stiffness).norm();
BOOST_CHECK_LT(error, hi_tol);
}
if (verbose) {
std::cout << "Post Cycle" << std::endl;
std::cout << "C₄ =" << std::endl << stiffness << std::endl;
}
}
BOOST_AUTO_TEST_SUITE_END();
} // muSpectre
c4science · Help