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test_remove_damage_weight_function.cc
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test_remove_damage_weight_function.cc
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/**
* @file test_remove_damage_weight_function.cc
*
* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Wed Oct 07 2015
* @date last modification: Wed Nov 27 2019
*
* @brief Test the damage weight funcion for non local computations
*
*
* @section LICENSE
*
* Copyright (©) 2015-2021 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 "dumper_paraview.hh"
#include "non_local_manager.hh"
#include "non_local_neighborhood.hh"
#include "solid_mechanics_model.hh"
#include "test_material.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
akantu::initialize("material_remove_damage.dat", argc, argv);
// some configuration variables
const UInt spatial_dimension = 2;
ElementType element_type = _quadrangle_4;
GhostType ghost_type = _not_ghost;
// mesh creation and read
Mesh mesh(spatial_dimension);
mesh.read("plate.msh");
/// model creation
SolidMechanicsModel model(mesh);
/// creation of material selector
auto && mat_selector =
std::make_shared<MeshDataMaterialSelector<std::string>>("physical_names",
model);
model.setMaterialSelector(mat_selector);
/// model initialization changed to use our material
model.initFull();
/// dump material index in paraview
model.addDumpField("material_index");
model.addDumpField("grad_u");
model.addDumpField("grad_u non local");
model.addDumpField("damage");
model.dump();
/// apply constant strain field in all elements except element 3 and 15
Matrix<Real> applied_strain(spatial_dimension, spatial_dimension);
applied_strain.zero();
for (UInt i = 0; i < spatial_dimension; ++i)
applied_strain(i, i) = 2.;
/// apply different strain in element 3 and 15
Matrix<Real> modified_strain(spatial_dimension, spatial_dimension);
modified_strain.zero();
for (UInt i = 0; i < spatial_dimension; ++i)
modified_strain(i, i) = 1.;
/// apply constant grad_u field in all elements
for (UInt m = 0; m < model.getNbMaterials(); ++m) {
Material & mat = model.getMaterial(m);
Array<Real> & grad_u = const_cast<Array<Real> &>(
mat.getInternal<Real>("eigen_grad_u")(element_type, ghost_type));
auto grad_u_it = grad_u.begin(spatial_dimension, spatial_dimension);
auto grad_u_end = grad_u.end(spatial_dimension, spatial_dimension);
UInt element_counter = 0;
for (; grad_u_it != grad_u_end; ++grad_u_it, ++element_counter)
if (element_counter == 12 || element_counter == 13 ||
element_counter == 14 || element_counter == 15)
(*grad_u_it) = -1. * modified_strain;
else
(*grad_u_it) = -1. * applied_strain;
}
/// compute the non-local strains
model.assembleInternalForces();
model.dump();
/// save the weights in a file
auto & neighborhood_1 = model.getNonLocalManager().getNeighborhood("mat_1");
auto & neighborhood_2 = model.getNonLocalManager().getNeighborhood("mat_2");
neighborhood_1.saveWeights("before_0");
neighborhood_2.saveWeights("before_1");
for (UInt n = 0; n < 2; ++n) {
/// print results to screen for validation
std::stringstream sstr;
sstr << "before_" << n << ".0";
std::ifstream weights;
weights.open(sstr.str());
std::string current_line;
while (getline(weights, current_line))
std::cout << current_line << std::endl;
weights.close();
}
/// apply damage to not have the elements with lower strain impact the
/// averaging
for (UInt m = 0; m < model.getNbMaterials(); ++m) {
auto & mat =
dynamic_cast<MaterialDamage<spatial_dimension> &>(model.getMaterial(m));
auto & damage = const_cast<Array<Real> &>(
mat.getInternal<Real>("damage")(element_type, ghost_type));
auto dam_it = damage.begin();
auto dam_end = damage.end();
UInt element_counter = 0;
for (; dam_it != dam_end; ++dam_it, ++element_counter)
if (element_counter == 12 || element_counter == 13 ||
element_counter == 14 || element_counter == 15)
*dam_it = 0.9;
}
/// compute the non-local strains
model.assembleInternalForces();
neighborhood_1.saveWeights("after_0");
neighborhood_2.saveWeights("after_1");
for (UInt n = 0; n < 2; ++n) {
/// print results to screen for validation
std::stringstream sstr;
sstr << "after_" << n << ".0";
std::ifstream weights;
weights.open(sstr.str());
std::string current_line;
while (getline(weights, current_line))
std::cout << current_line << std::endl;
weights.close();
}
model.dump();
/// verify the result: non-local averaging over constant field must
/// yield same constant field
Real test_result = 0.;
Matrix<Real> difference(spatial_dimension, spatial_dimension, 0.);
Matrix<Real> difference_in_damaged_elements(spatial_dimension,
spatial_dimension, 0.);
for (UInt m = 0; m < model.getNbMaterials(); ++m) {
difference_in_damaged_elements.zero();
auto & mat = model.getMaterial(m);
auto & grad_u_nl = const_cast<Array<Real> &>(
mat.getInternal<Real>("grad_u non local")(element_type, ghost_type));
auto grad_u_nl_it = grad_u_nl.begin(spatial_dimension, spatial_dimension);
auto grad_u_nl_end = grad_u_nl.end(spatial_dimension, spatial_dimension);
UInt element_counter = 0;
for (; grad_u_nl_it != grad_u_nl_end; ++grad_u_nl_it, ++element_counter) {
if (element_counter == 12 || element_counter == 13 ||
element_counter == 14 || element_counter == 15)
difference_in_damaged_elements += (*grad_u_nl_it);
else
difference = (*grad_u_nl_it) - applied_strain;
test_result += difference.norm<L_2>();
}
difference_in_damaged_elements *= (1 / 4.);
difference_in_damaged_elements -= (1.41142 * modified_strain);
test_result += difference_in_damaged_elements.norm<L_2>();
}
if (test_result > 10.e-5) {
std::cout << "the total norm is: " << test_result << std::endl;
return EXIT_FAILURE;
}
finalize();
return EXIT_SUCCESS;
}

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