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Tue, Nov 5, 15:56

material_thermal.cc
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/**
* @file material_thermal.cc
*
* @author Lucas Frerot <lucas.frerot@epfl.ch>
*
* @date Th Oct 17 11:56:37 2013
*
* @brief Specialization of the material class for the thermal 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_thermal.hh"
__BEGIN_AKANTU__
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
MaterialThermal<spatial_dimension>::MaterialThermal(SolidMechanicsModel & model, const ID & id) :
Material(model, id),
delta_T("delta_T", *this),
sigma_th_cur("sigma_th_cur", *this),
sigma_th_prev("sigma_th_prev", *this),
use_previous_stress_thermal(false) {
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", delta_T, _pat_parsable | _pat_modifiable, "Uniform temperature field");
delta_T.initialize(1);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
void MaterialThermal<dim>::computeStress(ElementType el_type, GhostType ghost_type) {
AKANTU_DEBUG_IN();
Array<Real>::iterator<> delta_t_it = this->delta_T(el_type, ghost_type).begin();
Array<Real>::iterator<> sigma_th_cur_it = this->sigma_th_cur(el_type, ghost_type).begin();
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
/// TODO : implement with the matrix alpha
if (dim == 1) {
*sigma_th_cur_it = - this->E * this->alpha * *delta_t_it;
}
else {
*sigma_th_cur_it = - this->E/(1-2*this->nu) * this->alpha * *delta_t_it;
}
++delta_t_it;
++sigma_th_cur_it;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialThermal<spatial_dimension>::initMaterial() {
AKANTU_DEBUG_IN();
sigma_th_cur .initialize(1);
if(use_previous_stress_thermal) {
sigma_th_prev.initialize(1);
}
Material::initMaterial();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt dim>
void MaterialThermal<dim>::savePreviousState(const GhostType ghost_type) {
AKANTU_DEBUG_IN();
Material::savePreviousState(ghost_type);
UInt spatial_dimension = model->getSpatialDimension();
Mesh::type_iterator it = model->getMesh().firstType(spatial_dimension, ghost_type);
Mesh::type_iterator last_type = model->getMesh().lastType(spatial_dimension, ghost_type);
if(use_previous_stress_thermal) {
for (; it != last_type; ++it) {
sigma_th_prev(*it, ghost_type).copy(sigma_th_cur(*it, ghost_type));
}
}
AKANTU_DEBUG_OUT();
}
INSTANSIATE_MATERIAL(MaterialThermal);
__END_AKANTU__

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