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material_cohesive_exponential.hh
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material_cohesive_exponential.hh
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/**
* @file material_cohesive_exponential.hh
*
* @author Fabian Barras <fabian.barras@epfl.ch>
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Fri Jun 18 2010
* @date last modification: Sun Dec 03 2017
*
* @brief Exponential irreversible cohesive law of mixed mode loading
*
* @section LICENSE
*
* Copyright (©) 2010-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* 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_cohesive.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_COHESIVE_EXPONENTIAL_HH__
#define __AKANTU_MATERIAL_COHESIVE_EXPONENTIAL_HH__
/* -------------------------------------------------------------------------- */
namespace akantu {
/**
* Cohesive material Exponential damage
*
* parameters in the material files :
* - sigma_c : critical stress sigma_c (default: 0)
* - beta : weighting parameter for sliding and normal opening (default:
* 0)
* - delta_c : critical opening (default: 0)
*/
template <UInt spatial_dimension>
class MaterialCohesiveExponential : public MaterialCohesive {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialCohesiveExponential(SolidMechanicsModel & model, const ID & id = "");
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
protected:
/// Initialization
void initMaterial() override;
/// constitutive law
void computeTraction(const Array<Real> & normal, ElementType el_type,
GhostType ghost_type = _not_ghost) override;
/// compute the tangent stiffness matrix for an element type
void computeTangentTraction(const ElementType & el_type,
Array<Real> & tangent_matrix,
const Array<Real> & normal,
GhostType ghost_type = _not_ghost) override;
private:
void computeCoupledTraction(Vector<Real> & tract, const Vector<Real> & normal,
Real delta, const Vector<Real> & opening,
Real & delta_max_new, Real delta_max);
void computeCompressiveTraction(Vector<Real> & tract,
const Vector<Real> & normal, Real delta_n,
const Vector<Real> & opening);
void computeCoupledTangent(Matrix<Real> & tangent,
const Vector<Real> & normal, Real delta,
const Vector<Real> & opening, Real delta_max_new);
void computeCompressivePenalty(Matrix<Real> & tangent,
const Vector<Real> & normal, Real delta_n);
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// beta parameter
Real beta;
/// contact penalty = initial slope ?
bool exp_penalty;
/// Ratio of contact tangent over the initial exponential tangent
Real contact_tangent;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
// #include "material_cohesive_exponential_inline_impl.cc"
} // namespace akantu
#endif /* __AKANTU_MATERIAL_COHESIVE_EXPONENTIAL_HH__ */

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