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material_neohookean.cc
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/**
* @file material_neohookean.cc
*
* @author Daniel Pino Muñoz <daniel.pinomunoz@epfl.ch>
*
* @date Tue Jul 27 18:15:37 2010
*
* @brief Specialization of the material class for finite deformation neo-hookean 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_neohookean.hh"
#include "solid_mechanics_model.hh"
__BEGIN_AKANTU__
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
MaterialNeohookean<spatial_dimension>::MaterialNeohookean(SolidMechanicsModel & model, const ID & id) :
Material(model, 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("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");
finite_deformation=true;
// use_previous_stress=true;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialNeohookean<spatial_dimension>::initMaterial() {
AKANTU_DEBUG_IN();
Material::initMaterial();
if (spatial_dimension == 1) nu = 0.;
updateInternalParameters();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialNeohookean<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;
}
/* -------------------------------------------------------------------------- */
template<UInt dim>
void MaterialNeohookean<dim>::computeStress(ElementType el_type, GhostType ghost_type) {
AKANTU_DEBUG_IN();
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
computeStressOnQuad(grad_u, sigma);
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
template<UInt spatial_dimension>
void MaterialNeohookean<spatial_dimension>::computePotentialEnergy(ElementType el_type,
GhostType ghost_type) {
AKANTU_DEBUG_IN();
Material::computePotentialEnergy(el_type, ghost_type);
if(ghost_type != _not_ghost) return;
Array<Real>::scalar_iterator epot = this->potential_energy(el_type, ghost_type).begin();
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
computePotentialEnergyOnQuad(grad_u, *epot);
++epot;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialNeohookean<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, grad_u);
MATERIAL_TANGENT_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialNeohookean<spatial_dimension>::getPushWaveSpeed(__attribute__((unused)) const Element & element) const {
return sqrt((lambda + 2 * mu) / rho);
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialNeohookean<spatial_dimension>::getShearWaveSpeed(__attribute__((unused)) const Element & element) const {
return sqrt(mu / rho);
}
/* -------------------------------------------------------------------------- */
INSTANSIATE_MATERIAL(MaterialNeohookean);
__END_AKANTU__

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