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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 creation: Fri Jun 18 2010
* @date last modification: Sun Dec 03 2017
*
* @brief Linear irreversible cohesive law with dissipative
* unloading-reloading cycles
*
*
* 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 "material_cohesive_linear.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MATERIAL_COHESIVE_LINEAR_FATIGUE_HH_
#define AKANTU_MATERIAL_COHESIVE_LINEAR_FATIGUE_HH_
/* -------------------------------------------------------------------------- */
namespace 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
void initMaterial() override;
protected:
/// constitutive law
void computeTraction(const Array<Real> & normal, ElementType el_type,
GhostType ghost_type = _not_ghost) override;
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/// get the switches
AKANTU_GET_MACRO_BY_ELEMENT_TYPE_CONST(Switches, switches, UInt);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private:
/// delta_f parameter
Real delta_f;
/// variable saying if delta_f is equal to delta_max for each
/// element when the traction is computed
bool progressive_delta_f;
/// count the opening/closing switches per element
bool count_switches;
/// 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;
/// Number of opening/closing switches
CohesiveInternalField<UInt> switches;
/// delta increment of the previous time step
CohesiveInternalField<Real> delta_dot_prec;
/// has the element passed to normal regime (not in fatigue anymore)
CohesiveInternalField<bool> normal_regime;
/// ratio indicating until what point fatigue is applied in the cohesive law
Real fatigue_ratio;
};
} // namespace akantu
#endif /* AKANTU_MATERIAL_COHESIVE_LINEAR_FATIGUE_HH_ */

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