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material_stiffness_proportional.cc
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Wed, Aug 28, 18:26

material_stiffness_proportional.cc
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/**
* Copyright (©) 2018-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* 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_stiffness_proportional.hh"
#include "solid_mechanics_model.hh"
namespace akantu {
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
MaterialStiffnessProportional<spatial_dimension>::MaterialStiffnessProportional(
SolidMechanicsModel & model, const ID & id)
: MaterialElastic<spatial_dimension>(model, id),
stress_viscosity("stress_viscosity", *this),
stress_elastic("stress_elastic", *this) {
AKANTU_DEBUG_IN();
this->registerParam("Alpha", alpha, 0., _pat_parsable | _pat_modifiable,
"Artificial viscous ratio");
this->stress_viscosity.initialize(spatial_dimension * spatial_dimension);
this->stress_elastic.initialize(spatial_dimension * spatial_dimension);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
void MaterialStiffnessProportional<spatial_dimension>::initMaterial() {
AKANTU_DEBUG_IN();
MaterialElastic<spatial_dimension>::initMaterial();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
void MaterialStiffnessProportional<spatial_dimension>::computeStress(
ElementType el_type, GhostType ghost_type) {
AKANTU_DEBUG_IN();
Array<Idx> & elem_filter = this->element_filter(el_type, ghost_type);
Array<Real> & stress_visc = stress_viscosity(el_type, ghost_type);
Array<Real> & stress_el = stress_elastic(el_type, ghost_type);
MaterialElastic<spatial_dimension>::computeStress(el_type, ghost_type);
Array<Real> & velocity = this->model.getVelocity();
Array<Real> strain_rate(0, spatial_dimension * spatial_dimension,
"strain_rate");
this->model.getFEEngine().gradientOnIntegrationPoints(
velocity, strain_rate, spatial_dimension, el_type, ghost_type,
elem_filter);
Array<Real>::matrix_iterator strain_rate_it =
strain_rate.begin(spatial_dimension, spatial_dimension);
Array<Real>::matrix_iterator stress_visc_it =
stress_visc.begin(spatial_dimension, spatial_dimension);
Array<Real>::matrix_iterator stress_el_it =
stress_el.begin(spatial_dimension, spatial_dimension);
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
Matrix<Real> & grad_v = *strain_rate_it;
Matrix<Real> & sigma_visc = *stress_visc_it;
Matrix<Real> & sigma_el = *stress_el_it;
MaterialElastic<spatial_dimension>::computeStressOnQuad(grad_v, sigma_visc);
sigma_visc *= alpha;
sigma_el.copy(sigma);
sigma += sigma_visc;
++strain_rate_it;
++stress_visc_it;
++stress_el_it;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
void MaterialStiffnessProportional<spatial_dimension>::computePotentialEnergy(
ElementType el_type) {
AKANTU_DEBUG_IN();
Array<Real> & stress_el = stress_elastic(el_type);
Array<Real>::matrix_iterator stress_el_it =
stress_el.begin(spatial_dimension, spatial_dimension);
Real * epot = this->potential_energy(el_type).data();
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, _not_ghost);
Matrix<Real> & sigma_el = *stress_el_it;
MaterialElastic<spatial_dimension>::computePotentialEnergyOnQuad(
grad_u, sigma_el, *epot);
epot++;
++stress_el_it;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
INSTANTIATE_MATERIAL(ve_stiffness_prop, MaterialStiffnessProportional);
} // namespace akantu

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