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rAKA/src/model/phase_field/phasefields/phasefield_exponential_inline_impl.hh
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phasefield_exponential_inline_impl.hh
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/**
* Copyright (©) 2022-2023 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 "phasefield_exponential.hh"
namespace akantu {
inline void PhaseFieldExponential::computeDissipatedEnergyOnQuad(
const Real & dam, const Vector<Real> & grad_d, Real & edis,
Real & g_c_quad) {
edis = 0.;
for (auto i : arange(spatial_dimension)) {
edis += 0.5 * g_c_quad * this->l0 * grad_d[i] * grad_d[i];
}
edis += g_c_quad * dam * dam / (2 * this->l0);
}
/* -------------------------------------------------------------------------- */
inline void PhaseFieldExponential::computeDamageEnergyDensityOnQuad(
const Real & phi_quad, Real & dam_energy_quad, const Real & g_c_quad) {
dam_energy_quad = 2.0 * phi_quad + g_c_quad / this->l0;
}
/* -------------------------------------------------------------------------- */
inline void
PhaseFieldExponential::computePhiOnQuad(const Matrix<Real> & strain_quad,
Real & phi_quad, Real & phi_hist_quad) {
Matrix<Real> strain_plus(spatial_dimension, spatial_dimension);
Matrix<Real> strain_dir(spatial_dimension, spatial_dimension);
Matrix<Real> strain_diag_plus(spatial_dimension, spatial_dimension);
Vector<Real> strain_values(spatial_dimension);
Real trace_plus;
strain_plus.zero();
strain_dir.zero();
strain_values.zero();
strain_diag_plus.zero();
strain_quad.eig(strain_values, strain_dir);
for (Int i = 0; i < spatial_dimension; i++) {
strain_diag_plus(i, i) = std::max(Real(0.), strain_values(i));
}
Matrix<Real> mat_tmp(spatial_dimension, spatial_dimension);
Matrix<Real> sigma_plus(spatial_dimension, spatial_dimension);
mat_tmp = strain_diag_plus * strain_dir.transpose();
strain_plus = strain_dir * mat_tmp;
trace_plus = std::max(Real(0.), strain_quad.trace());
for (Int i = 0; i < spatial_dimension; i++) {
for (Int j = 0; j < spatial_dimension; j++) {
sigma_plus(i, j) = static_cast<Real>(i == j) * lambda * trace_plus +
2 * mu * strain_plus(i, j);
}
}
phi_quad = sigma_plus.doubleDot(strain_plus) / 2.;
if (phi_quad < phi_hist_quad) {
phi_quad = phi_hist_quad;
}
}
} // namespace akantu
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