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rAKA/src/model/solid_mechanics/materials/material_cohesive/constitutive_laws/material_cohesive_linear_fatigue.hh
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material_cohesive_linear_fatigue.hh
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/**
* @file material_cohesive_linear_fatigue.hh
* @author Marco Vocialta <marco.vocialta@epfl.ch>
* @date Thu Feb 19 14:20:59 2015
*
* @brief Linear irreversible cohesive law with dissipative
* unloading-reloading cycles
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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 "material_cohesive_linear.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_COHESIVE_LINEAR_FATIGUE_HH__
#define __AKANTU_MATERIAL_COHESIVE_LINEAR_FATIGUE_HH__
/* -------------------------------------------------------------------------- */
__BEGIN_AKANTU__
/**
* Linear irreversible cohesive law with dissipative
* unloading-reloading cycles
*
* This law uses two different stiffnesses during unloading and
* reloading. The implementation is based on the article entitled "A
* cohesive model for fatigue crack growth" by Nguyen, Repetto, Ortiz
* and Radovitzky (2001). This law is identical to the
* MaterialCohesiveLinear one except for the unloading-reloading
* phase.
*
* input parameter:
*
* - delta_f : it must be greater than delta_c and it is inversely
* proportional to the dissipation in the unloading-reloading
* cycles (default: delta_c)
*/
template <UInt spatial_dimension>
class MaterialCohesiveLinearFatigue : public MaterialCohesiveLinear<spatial_dimension> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialCohesiveLinearFatigue(SolidMechanicsModel & model, const ID & id = "");
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
/// initialize the material parameters
virtual void initMaterial();
protected:
/// constitutive law
virtual void computeTraction(const Array<Real> & normal,
ElementType el_type,
GhostType ghost_type = _not_ghost);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private:
/// delta_f parameter
Real delta_f;
/// variable saying if there should be penalty contact also after
/// breaking the cohesive elements
bool contact_after_breaking;
/// delta of the previous step
CohesiveInternalField<Real> delta_prec;
/// stiffness for reloading
CohesiveInternalField<Real> K_plus;
/// stiffness for unloading
CohesiveInternalField<Real> K_minus;
/// 1D traction in the cohesive law
CohesiveInternalField<Real> T_1d;
};
__END_AKANTU__
#endif /* __AKANTU_MATERIAL_COHESIVE_LINEAR_FATIGUE_HH__ */
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