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material_elastic.cc
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/**
* @file material_elastic.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Lucas Frerot <lucas.frerot@epfl.ch>
*
* @date Tue Jul 27 18:15:37 2010
*
* @brief Specialization of the material class for the elastic material
*
* @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 "material_elastic.hh"
#include "solid_mechanics_model.hh"
__BEGIN_AKANTU__
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
MaterialElastic<spatial_dimension>::MaterialElastic(SolidMechanicsModel & model, const ID & id) :
Material(model, id),
delta_t("delta_t", id) {
AKANTU_DEBUG_IN();
this->registerParam("E" ,E , 0. , _pat_parsable | _pat_modifiable, "Young's modulus" );
this->registerParam("nu" ,nu , 0.5 , _pat_parsable | _pat_modifiable, "Poisson's ratio" );
this->registerParam("alpha" ,alpha , 0. , _pat_parsable | _pat_modifiable, "Thermal expansion coefficient");
this->registerParam("delta_t_init",delta_t_init, 0. , _pat_parsable | _pat_modifiable, "Uniform temperature field (for test purposes)");
this->registerParam("Plane_Stress",plane_stress, false, _pat_parsmod, "Is plane stress" ); /// @todo Plane_Stress should not be possible to be modified after initMaterial (but before)
this->registerParam("lambda" ,lambda , _pat_readable, "First Lamé coefficient" );
this->registerParam("mu" ,mu , _pat_readable, "Second Lamé coefficient");
this->registerParam("kapa" ,kpa , _pat_readable, "Bulk coefficient" );
initInternalArray(delta_t, 1);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialElastic<spatial_dimension>::initMaterial() {
AKANTU_DEBUG_IN();
Material::initMaterial();
if (spatial_dimension == 1) nu = 0.;
updateInternalParameters();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialElastic<spatial_dimension>::updateInternalParameters() {
lambda = nu * E / ((1 + nu) * (1 - 2*nu));
mu = E / (2 * (1 + nu));
if(plane_stress) lambda = nu * E / ((1 + nu)*(1 - nu));
kpa = lambda + 2./3. * mu;
const Mesh & mesh = this->model->getFEM().getMesh();
Mesh::type_iterator it = mesh.firstType(spatial_dimension);
Mesh::type_iterator last_type = mesh.lastType(spatial_dimension);
this->resizeInternalArray(delta_t);
for (; it != last_type ; ++it) {
Array<Real> & delta_t_vec = delta_t(*it);
delta_t_vec.set(delta_t_init);
}
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialElastic<spatial_dimension>::computeStress(ElementType el_type, GhostType ghost_type) {
AKANTU_DEBUG_IN();
Array<Real> & dt = delta_t(el_type, ghost_type);
Array<Real>::iterator<> dt_it = dt.begin();
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
computeStressOnQuad(grad_u, sigma, *dt_it);
++dt_it;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialElastic<spatial_dimension>::computeTangentModuli(__attribute__((unused)) const ElementType & el_type,
Array<Real> & tangent_matrix,
__attribute__((unused)) GhostType ghost_type) {
AKANTU_DEBUG_IN();
MATERIAL_TANGENT_QUADRATURE_POINT_LOOP_BEGIN(tangent_matrix);
computeTangentModuliOnQuad(tangent);
MATERIAL_TANGENT_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialElastic<spatial_dimension>::getPushWaveSpeed() const {
return sqrt((lambda + 2*mu)/rho);
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialElastic<spatial_dimension>::getShearWaveSpeed() const {
return sqrt(mu/rho);
}
/* -------------------------------------------------------------------------- */
INSTANSIATE_MATERIAL(MaterialElastic);
__END_AKANTU__

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