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Fri, Dec 20, 14:58

material_thermal.hh
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/**
* @file material_thermal.hh
*
* @author Lucas Frerot <lucas.frerot@epfl.ch>
*
* @date creation: Fri Jun 18 2010
* @date last modification: Mon Jan 29 2018
*
* @brief Material isotropic thermo-elastic
*
* @section LICENSE
*
* Copyright (©) 2010-2018 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 "aka_common.hh"
#include "material.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_THERMAL_HH__
#define __AKANTU_MATERIAL_THERMAL_HH__
namespace akantu {
template <UInt spatial_dimension> class MaterialThermal : public Material {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialThermal(SolidMechanicsModel & model, const ID & id = "");
MaterialThermal(SolidMechanicsModel & model, UInt dim, const Mesh & mesh,
FEEngine & fe_engine, const ID & id = "");
~MaterialThermal() override = default;
protected:
void initialize();
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
void initMaterial() override;
/// constitutive law for all element of a type
void computeStress(ElementType el_type, GhostType ghost_type) override;
/// local computation of thermal stress
inline void computeStressOnQuad(Real & sigma, const Real & deltaT);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// Young modulus
Real E;
/// Poisson ratio
Real nu;
/// Thermal expansion coefficient
/// TODO : implement alpha as a matrix
Real alpha;
/// Temperature field
InternalField<Real> delta_T;
/// Current thermal stress
InternalField<Real> sigma_th;
/// Tell if we need to use the previous thermal stress
bool use_previous_stress_thermal;
};
/* ------------------------------------------------------------------------ */
/* Inline impl */
/* ------------------------------------------------------------------------ */
template <UInt dim>
inline void MaterialThermal<dim>::computeStressOnQuad(Real & sigma,
const Real & deltaT) {
sigma = -this->E / (1. - 2. * this->nu) * this->alpha * deltaT;
}
template <>
inline void MaterialThermal<1>::computeStressOnQuad(Real & sigma,
const Real & deltaT) {
sigma = -this->E * this->alpha * deltaT;
}
} // akantu
#endif /* __AKANTU_MATERIAL_THERMAL_HH__ */

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