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material_brittle.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/>.
*/
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "material.hh"
#include "material_damage.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MATERIAL_BRITTLE_HH_
#define AKANTU_MATERIAL_BRITTLE_HH_
namespace akantu {
/**
* Material brittle
*
* parameters in the material files :
* - S_0 : Critical stress at low strain rate (default: 157e6)
* - E_0 : Low strain rate threshold (default: 27e3)
* - A,B,C,D : Fitting parameters for the critical stress at high strain
* rates
* (default: 1.622e-11, -1.3274e-6, 3.6544e-2, -181.38)
*/
template <Int spatial_dimension>
class MaterialBrittle : public MaterialDamage<spatial_dimension> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialBrittle(SolidMechanicsModel & model, const ID & id = "");
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
void initMaterial() override;
void updateInternalParameters() override;
/// constitutive law for all element of a type
void computeStress(ElementType el_type,
GhostType ghost_type = _not_ghost) override;
protected:
/// constitutive law for a given quadrature point
inline void computeStressOnQuad(Matrix<Real> & grad_u, Matrix<Real> & grad_v,
Matrix<Real> & sigma, Real & dam,
Real & sigma_equivalent,
Real & fracture_stress);
inline void computeDamageAndStressOnQuad(Matrix<Real> & sigma, Real & dam,
Real & sigma_c,
Real & fracture_stress);
/* ------------------------------------------------------------------------ */
/* DataAccessor inherited members */
/* ------------------------------------------------------------------------ */
public:
inline UInt getNbData(const Array<Element> & elements,
const SynchronizationTag & tag) const override;
inline void packData(CommunicationBuffer & buffer,
const Array<Element> & elements,
const SynchronizationTag & tag) const override;
inline void unpackData(CommunicationBuffer & buffer,
const Array<Element> & elements,
const SynchronizationTag & tag) override;
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// strain rate arrays ordered by element types
InternalField<Real> strain_rate_brittle;
// polynome constants for critical stress value
Real A;
Real B;
Real C;
Real D;
// minimum strain rate
Real E_0;
// Critical stress at low strain rates
Real S_0;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
#include "material_brittle_inline_impl.hh"
} // namespace akantu
#endif /* AKANTU_MATERIAL_brittle_HH_ */

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