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test_cohesive_intrinsic.cc
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test_cohesive_intrinsic.cc
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/**
* @file test_cohesive.cc
* @author Marco Vocialta <marco.vocialta@epfl.ch>
* @date Fri Feb 24 14:32:31 2012
*
* @brief Test for cohesive elements
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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 <limits>
#include <fstream>
#include <iostream>
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "mesh_io_msh.hh"
#include "mesh_utils.hh"
#include "solid_mechanics_model_cohesive.hh"
#include "material.hh"
//#include "io_helper.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
static void updateDisplacement(SolidMechanicsModelCohesive &,
Vector<UInt> &,
ElementType,
Real);
int main(int argc, char *argv[]) {
initialize(argc, argv);
debug::setDebugLevel(dblDump);
const UInt spatial_dimension = 2;
const UInt max_steps = 350;
const ElementType type = _triangle_6;
Mesh mesh(spatial_dimension);
MeshIOMSH mesh_io;
mesh_io.read("mesh.msh", mesh);
SolidMechanicsModelCohesive model(mesh);
/// model initialization
model.initFull("material.dat");
Real time_step = model.getStableTimeStep()*0.8;
model.setTimeStep(time_step);
// std::cout << "Time step: " << time_step << std::endl;
model.assembleMassLumped();
/* ------------------------------------------------------------------------ */
/* Facet part */
/* ------------------------------------------------------------------------ */
std::cout << mesh << std::endl;
const Mesh & mesh_facets = model.getMeshFacets();
std::cout << mesh_facets << std::endl;
const ElementType type_facet = mesh.getFacetElementType(type);
UInt nb_facet = mesh_facets.getNbElement(type_facet);
// const Vector<Real> & position = mesh.getNodes();
// Vector<Real> & displacement = model.getDisplacement();
// const Vector<UInt> & connectivity = mesh_facets.getConnectivity(type_facet);
Vector<UInt> facet_insertion;
Real * bary_facet = new Real[spatial_dimension];
for (UInt f = 0; f < nb_facet; ++f) {
mesh_facets.getBarycenter(f, type_facet, bary_facet);
if (bary_facet[0] > -0.26 && bary_facet[0] < -0.24) facet_insertion.push_back(f);
}
delete[] bary_facet;
model.insertCohesiveElements(facet_insertion);
// mesh_io.write("mesh_cohesive.msh", mesh);
// std::cout << mesh << std::endl;
/* ------------------------------------------------------------------------ */
/* End of facet part */
/* ------------------------------------------------------------------------ */
Vector<bool> & boundary = model.getBoundary();
// const Vector<Real> & residual = model.getResidual();
UInt nb_nodes = mesh.getNbNodes();
UInt nb_element = mesh.getNbElement(type);
/// boundary conditions
for (UInt dim = 0; dim < spatial_dimension; ++dim) {
for (UInt n = 0; n < nb_nodes; ++n) {
boundary(n, dim) = true;
}
}
model.updateResidual();
// iohelper::ElemType paraview_type = iohelper::TRIANGLE2;
// /// initialize the paraview output
// iohelper::DumperParaview dumper;
// dumper.SetPoints(model.getFEM().getMesh().getNodes().values,
// spatial_dimension, nb_nodes, "explicit");
// dumper.SetConnectivity((int *)model.getFEM().getMesh().getConnectivity(type).values,
// paraview_type, nb_element, iohelper::C_MODE);
// dumper.AddNodeDataField(model.getDisplacement().values,
// spatial_dimension, "displacements");
// dumper.AddNodeDataField(model.getVelocity().values,
// spatial_dimension, "velocity");
// dumper.AddNodeDataField(model.getAcceleration().values,
// spatial_dimension, "acceleration");
// dumper.AddNodeDataField(model.getForce().values,
// spatial_dimension, "applied_force");
// dumper.AddNodeDataField(model.getResidual().values,
// spatial_dimension, "forces");
// dumper.AddElemDataField(model.getMaterial(0).getStrain(type).values,
// spatial_dimension*spatial_dimension, "strain");
// dumper.AddElemDataField(model.getMaterial(0).getStress(type).values,
// spatial_dimension*spatial_dimension, "stress");
// dumper.SetEmbeddedValue("displacements", 1);
// dumper.SetEmbeddedValue("applied_force", 1);
// dumper.SetEmbeddedValue("forces", 1);
// dumper.SetPrefix("paraview/");
// dumper.Init();
// dumper.Dump();
/// update displacement
Vector<UInt> elements;
Real * bary = new Real[spatial_dimension];
for (UInt el = 0; el < nb_element; ++el) {
mesh.getBarycenter(el, type, bary);
if (bary[0] > -0.25) elements.push_back(el);
}
delete[] bary;
Real increment = 0.01;
updateDisplacement(model, elements, type, increment);
// for (UInt n = 0; n < nb_nodes; ++n) {
// if (position(n, 1) + displacement(n, 1) > 0) {
// if (position(n, 0) == 0) {
// displacement(n, 1) -= 0.25;
// }
// if (position(n, 0) == 1) {
// displacement(n, 1) += 0.25;
// }
// }
// }
// std::ofstream edis("edis.txt");
// std::ofstream erev("erev.txt");
/// Main loop
for (UInt s = 1; s <= max_steps; ++s) {
model.explicitPred();
model.updateResidual();
model.updateAcceleration();
model.explicitCorr();
updateDisplacement(model, elements, type, increment);
if(s % 1 == 0) {
// dumper.Dump();
std::cout << "passing step " << s << "/" << max_steps << std::endl;
}
// // update displacement
// for (UInt n = 0; n < nb_nodes; ++n) {
// if (position(n, 1) + displacement(n, 1) > 0) {
// displacement(n, 0) -= 0.01;
// }
// }
// Real Ed = dynamic_cast<MaterialCohesive&> (model.getMaterial(1)).getDissipatedEnergy();
// Real Er = dynamic_cast<MaterialCohesive&> (model.getMaterial(1)).getReversibleEnergy();
// edis << s << " "
// << Ed << std::endl;
// erev << s << " "
// << Er << std::endl;
}
// edis.close();
// erev.close();
Real Ed = model.getEnergy("dissipated");
Real Edt = 2 * sqrt(2);
std::cout << Ed << " " << Edt << std::endl;
if (Ed < Edt * 0.999 || Ed > Edt * 1.001) {
std::cout << "The dissipated energy is incorrect" << std::endl;
return EXIT_FAILURE;
}
finalize();
std::cout << "OK: test_cohesive_intrinsic was passed!" << std::endl;
return EXIT_SUCCESS;
}
static void updateDisplacement(SolidMechanicsModelCohesive & model,
Vector<UInt> & elements,
ElementType type,
Real increment) {
Mesh & mesh = model.getFEM().getMesh();
UInt nb_element = elements.getSize();
UInt nb_nodes = mesh.getNbNodes();
UInt nb_nodes_per_element = mesh.getNbNodesPerElement(type);
const Vector<UInt> & connectivity = mesh.getConnectivity(type);
Vector<Real> & displacement = model.getDisplacement();
Vector<bool> update(nb_nodes);
update.clear();
for (UInt el = 0; el < nb_element; ++el) {
for (UInt n = 0; n < nb_nodes_per_element; ++n) {
UInt node = connectivity(elements(el), n);
if (!update(node)) {
displacement(node, 0) += increment;
// displacement(node, 1) += increment;
update(node) = true;
}
}
}
}

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