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test_ASR_damage.cc
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test_ASR_damage.cc
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/**
* @file test_ASR_damage.cc
*
* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
*
*
* @brief test the solidmechancis model for IGFEM analysis
*
*
* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "solid_mechanics_model_igfem.hh"
/* -------------------------------------------------------------------------- */
#include "material_damage_iterative.hh"
#include "material_igfem_saw_tooth_damage.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
/// function declaration
void applyBoundaryConditions(SolidMechanicsModelIGFEM & model);
class ASRMaterialSelector : public MaterialSelector {
public:
ASRMaterialSelector(SolidMechanicsModelIGFEM & model) : model(model) {}
UInt operator()(const Element & elem) {
if (Mesh::getKind(elem.type) == _ek_igfem)
/// choose IGFEM material
return 2;
const Mesh & mesh = model.getMesh();
UInt spatial_dimension = model.getSpatialDimension();
Vector<Real> barycenter(spatial_dimension);
mesh.getBarycenter(elem, barycenter);
if (model.isInside(barycenter))
return 1;
return 0;
}
protected:
SolidMechanicsModelIGFEM & model;
};
typedef Spherical SK;
int main(int argc, char * argv[]) {
initialize("material_ASR.dat", argc, argv);
/// problem dimension
const UInt spatial_dimension = 2;
StaticCommunicator & comm =
akantu::StaticCommunicator::getStaticCommunicator();
Int psize = comm.getNbProc();
Int prank = comm.whoAmI();
/// mesh creation
Mesh mesh(spatial_dimension);
akantu::MeshPartition * partition = NULL;
if (prank == 0) {
mesh.read("one_inclusion.msh");
/// partition the mesh
partition = new MeshPartitionScotch(mesh, spatial_dimension);
partition->partitionate(psize);
}
/// model creation
SolidMechanicsModelIGFEM model(mesh);
model.initParallel(partition);
delete partition;
/// register the gel pocket list in the model
std::list<SK::Sphere_3> gel_pocket_list;
model.registerGeometryObject(gel_pocket_list, "gel");
ASRMaterialSelector * mat_selector;
mat_selector = new ASRMaterialSelector(model);
model.setMaterialSelector(*mat_selector);
model.initFull();
/// add fields that should be dumped
model.setBaseName("regular_elements");
model.addDumpField("material_index");
model.addDumpField("damage");
model.addDumpField("Sc");
model.addDumpField("partitions");
model.addDumpField("eigen_grad_u");
model.addDumpField("blocked_dofs");
model.setBaseNameToDumper("igfem elements", "igfem elements");
model.addDumpFieldToDumper("igfem elements", "material_index");
model.addDumpFieldToDumper("igfem elements", "Sc");
model.addDumpFieldToDumper("igfem elements", "damage");
model.addDumpFieldToDumper("igfem elements", "lambda");
model.addDumpFieldToDumper("igfem elements", "eigen_grad_u");
model.addDumpFieldToDumper("igfem elements", "blocked_dofs");
/// dump before the interface generation
model.dump();
model.dump("igfem elements");
/// weaken one element to enforce damage there
Array<Real> & Sc =
model.getMaterial(0).getInternal<Real>("Sc")(_triangle_3, _not_ghost);
Sc(11) = 1;
/// create the gel pocket
Real initial_gel_radius = 0.1;
SK::Sphere_3 sphere_1(SK::Point_3(0., 0., 0.),
initial_gel_radius * initial_gel_radius);
gel_pocket_list.push_back(sphere_1);
/// create the interface
model.update("gel");
/// apply eigenstrain the eigenstrain in the inclusions
Matrix<Real> prestrain(spatial_dimension, spatial_dimension, 0.);
for (UInt i = 0; i < spatial_dimension; ++i)
prestrain(i, i) = 0.05;
model.applyEigenGradU(prestrain, "gel", _not_ghost);
applyBoundaryConditions(model);
/// dump
model.dump("igfem elements");
model.dump();
/// Instantiate objects of class MyDamageso
MaterialDamageIterative<spatial_dimension> & mat_aggregate =
dynamic_cast<MaterialDamageIterative<spatial_dimension> &>(
model.getMaterial(0));
MaterialIGFEMSawToothDamage<spatial_dimension> & mat_igfem =
dynamic_cast<MaterialIGFEMSawToothDamage<spatial_dimension> &>(
model.getMaterial(2));
bool factorize = false;
bool converged = false;
Real error;
UInt nb_damaged_elements = 0;
Real max_eq_stress_aggregate = 0;
Real max_igfem = 0;
const Array<Real> & stress =
model.getMaterial(2).getStress(_igfem_triangle_5, _not_ghost);
Array<Real>::const_matrix_iterator stress_it =
stress.begin(spatial_dimension, spatial_dimension);
do {
converged = model.solveStep<_scm_newton_raphson_tangent,
SolveConvergenceCriteria::_increment>(
1e-6, error, 2, factorize);
/// compute damage
max_eq_stress_aggregate = mat_aggregate.getNormMaxEquivalentStress();
max_igfem = mat_igfem.getNormMaxEquivalentStress();
if (max_eq_stress_aggregate > max_igfem)
nb_damaged_elements = mat_aggregate.updateDamage();
else
nb_damaged_elements = mat_igfem.updateDamage();
std::cout << "damaged elements: " << nb_damaged_elements << std::endl;
for (UInt i = 0; i < 5; ++i) {
std::cout << *stress_it << std::endl;
++stress_it;
}
model.dump();
model.dump("igfem elements");
} while (nb_damaged_elements);
model.dump();
model.dump("igfem elements");
finalize();
return EXIT_SUCCESS;
}
/* -------------------------------------------------------------------------- */
void applyBoundaryConditions(SolidMechanicsModelIGFEM & model) {
/// boundary conditions
Mesh & mesh = model.getMesh();
mesh.computeBoundingBox();
const Vector<Real> & lowerBounds = mesh.getLowerBounds();
const Vector<Real> & upperBounds = mesh.getUpperBounds();
Real bottom = lowerBounds(1);
Real top = upperBounds(1);
Real left = lowerBounds(0);
// Real right = upperBounds(0);
Real eps = std::abs((top - bottom) * 1e-12);
const Array<Real> & pos = mesh.getNodes();
Array<Real> & disp = model.getDisplacement();
Array<bool> & boun = model.getBlockedDOFs();
disp.zero();
boun.zero();
/// free expansion
for (UInt i = 0; i < mesh.getNbNodes(); ++i) {
if (std::abs(pos(i, 1) - bottom) < eps) {
boun(i, 1) = true;
disp(i, 1) = 0.0;
}
if (std::abs(pos(i, 0) - left) < eps) {
boun(i, 0) = true;
disp(i, 0) = 0.0;
}
}
}

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