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material_brittle.cc
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Fri, May 17, 02:17

material_brittle.cc
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/**
* @file material_brittle.cc
*
* @author Aranda Ruiz Josue <josue.arandaruiz@epfl.ch>
* @author Daniel Pino Muñoz <daniel.pinomunoz@epfl.ch>
*
*
* @brief Specialization of the material class for the brittle material
*
*
* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
*/
/* -------------------------------------------------------------------------- */
#include "material_brittle.hh"
#include "solid_mechanics_model.hh"
namespace akantu {
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
MaterialBrittle<spatial_dimension>::MaterialBrittle(SolidMechanicsModel & model,
const ID & id)
: MaterialDamage<spatial_dimension>(model, id),
strain_rate_brittle("strain_rate_brittle", *this) {
AKANTU_DEBUG_IN();
this->registerParam("S_0", S_0, 157e6, _pat_parsable | _pat_modifiable);
this->registerParam("E_0", E_0, 27e3, _pat_parsable, "Strain rate threshold");
this->registerParam("A", A, 1.622e-5, _pat_parsable,
"Polynome cubic constant");
this->registerParam("B", B, -1.3274, _pat_parsable,
"Polynome quadratic constant");
this->registerParam("C", C, 3.6544e4, _pat_parsable,
"Polynome linear constant");
this->registerParam("D", D, -181.38e6, _pat_parsable, "Polynome constant");
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
void MaterialBrittle<spatial_dimension>::initMaterial() {
AKANTU_DEBUG_IN();
MaterialDamage<spatial_dimension>::initMaterial();
this->strain_rate_brittle.initialize(spatial_dimension * spatial_dimension);
updateInternalParameters();
// this->Yd.resize();
// const Mesh & mesh = this->model.getFEEngine().getMesh();
// Mesh::type_iterator it = mesh.firstType(spatial_dimension);
// Mesh::type_iterator last_type = mesh.lastType(spatial_dimension);
// for(; it != last_type; ++it) {
// UInt nb_element = this->element_filter(*it).getSize();
// UInt nb_quad = this->model.getFEEngine().getNbQuadraturePoints(*it);
// Array <Real> & Yd_rand_vec = Yd_rand(*it);
// for(UInt e = 0; e < nb_element; ++e) {
// Real rand_part = (2 * drand48()-1) * Yd_randomness * Yd;
// for(UInt q = 0; q < nb_quad; ++q)
// Yd_rand_vec(nb_quad*e+q,0) = Yd + rand_part;
// }
// }
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
void MaterialBrittle<spatial_dimension>::updateInternalParameters() {
MaterialDamage<spatial_dimension>::updateInternalParameters();
}
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
void MaterialBrittle<spatial_dimension>::computeStress(ElementType el_type,
GhostType ghost_type) {
AKANTU_DEBUG_IN();
Real * dam = this->damage(el_type, ghost_type).data();
Array<Real> & velocity = this->model.getVelocity();
Array<Real> & strain_rate_brittle =
this->strain_rate_brittle(el_type, ghost_type);
Array<Idx> & elem_filter = this->element_filter(el_type, ghost_type);
this->model.getFEEngine().gradientOnIntegrationPoints(
velocity, strain_rate_brittle, spatial_dimension, el_type, ghost_type,
elem_filter);
Array<Real>::iterator<Matrix<Real>> strain_rate_it =
this->strain_rate_brittle(el_type, ghost_type)
.begin(spatial_dimension, spatial_dimension);
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
Real sigma_equivalent = 0;
Real fracture_stress = 0;
Matrix<Real> & grad_v = *strain_rate_it;
computeStressOnQuad(grad_u, grad_v, sigma, *dam, sigma_equivalent,
fracture_stress);
++strain_rate_it;
++dam;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
INSTANTIATE_MATERIAL(brittle, MaterialBrittle);
} // namespace akantu

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