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rAKA/src/model/solid_mechanics/materials/material_plastic/material_plastic.cc
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material_plastic.cc
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/**
* Copyright (©) 2014-2023 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_plastic.hh"
/* -------------------------------------------------------------------------- */
namespace akantu {
/* -------------------------------------------------------------------------- */
template <Int dim>
MaterialPlastic<dim>::MaterialPlastic(SolidMechanicsModel & model,
const ID & id, const ID & fe_engine_id)
: MaterialElastic<dim>(model, id, fe_engine_id),
iso_hardening(this->registerInternal("iso_hardening", 1)),
inelastic_strain(this->registerInternal("inelastic_strain", dim * dim)),
plastic_energy(this->registerInternal("plastic_energy", 1)),
d_plastic_energy(this->registerInternal("d_plastic_energy", 1)) {
this->registerParam("h", h, Real(0.), _pat_parsable | _pat_modifiable,
"Hardening modulus");
this->registerParam("sigma_y", sigma_y, Real(0.),
_pat_parsable | _pat_modifiable, "Yield stress");
this->iso_hardening.initializeHistory();
this->inelastic_strain.initializeHistory();
}
/* -------------------------------------------------------------------------- */
template <Int dim>
Real MaterialPlastic<dim>::getEnergy(const std::string & type) {
if (type == "plastic") {
return getPlasticEnergy();
}
return MaterialElastic<dim>::getEnergy(type);
}
/* -------------------------------------------------------------------------- */
template <Int dim> Real MaterialPlastic<dim>::getPlasticEnergy() {
AKANTU_DEBUG_IN();
auto & fem = this->getFEEngine();
Real penergy = 0.;
for (const auto & type :
this->getElementFilter().elementTypes(dim, _not_ghost)) {
penergy += fem.integrate(plastic_energy(type, _not_ghost), type, _not_ghost,
this->getElementFilter(type, _not_ghost));
}
AKANTU_DEBUG_OUT();
return penergy;
}
/* -------------------------------------------------------------------------- */
template <Int dim>
void MaterialPlastic<dim>::computePotentialEnergy(ElementType el_type) {
for (auto && [args, epot] :
zip(getArguments(el_type), this->potential_energy(el_type))) {
Matrix<Real, dim, dim> elastic_strain =
args["grad_u"_n] - args["inelastic_strain"_n];
MaterialElastic<dim>::computePotentialEnergyOnQuad(
tuple::replace(args, "grad_u"_n = elastic_strain), epot);
}
}
/* -------------------------------------------------------------------------- */
template <Int dim>
void MaterialPlastic<dim>::updateEnergies(ElementType el_type) {
MaterialElastic<dim>::updateEnergies(el_type);
for (auto && args : zip_append(getArguments(el_type),
"pe"_n = this->plastic_energy(el_type),
"wp"_n = this->d_plastic_energy(el_type))) {
Matrix<Real, dim, dim> delta_strain =
args["inelastic_strain"_n] - args["previous_inelastic_strain"_n];
Matrix<Real, dim, dim> sigma_h = args["sigma"_n] + args["previous_sigma"_n];
auto && wp = args["wp"_n];
wp = sigma_h.doubleDot(delta_strain) / 2.;
args["pe"_n] += wp;
}
}
/* -------------------------------------------------------------------------- */
template class MaterialPlastic<1>;
template class MaterialPlastic<2>;
template class MaterialPlastic<3>;
} // namespace akantu
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