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material_damage_linear_inline_impl.hh
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Fri, Aug 2, 18:58

material_damage_linear_inline_impl.hh
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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/>.
*/
/* -------------------------------------------------------------------------- */
template <Int spatial_dimension>
inline void MaterialDamageLinear<spatial_dimension>::computeStressOnQuad(
Matrix<Real> & grad_u, Matrix<Real> & sigma, Real & dam, Real & K) {
Real Fdiag[3];
Real Fdiagp[3];
Math::matrix33_eigenvalues(grad_u.data(), Fdiag);
Fdiagp[0] = std::max(0., Fdiag[0]);
Fdiagp[1] = std::max(0., Fdiag[1]);
Fdiagp[2] = std::max(0., Fdiag[2]);
Real Ehat = sqrt(Fdiagp[0] * Fdiagp[0] + Fdiagp[1] * Fdiagp[1] +
Fdiagp[2] * Fdiagp[2]);
MaterialElastic<spatial_dimension>::computeStressOnQuad(grad_u, sigma);
Real Fd = Ehat - K;
if (Fd > 0) {
dam = (Ehat - Epsmin) / (Epsmax - Epsmin) * (Ehat / Epsmax);
dam = std::min(dam, 1.);
K = Ehat;
}
sigma *= 1 - dam;
}

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