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rAKA/src/material_damage/material_iterative_stiffness_reduction.hh
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material_iterative_stiffness_reduction.hh
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/**
* @file material_iterative_stiffness_reduction.hh
* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
* @date Thu Feb 18 15:25:05 2016
*
* @brief Damage material with constant stiffness reduction
*
* @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_damage_iterative.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_ITERATIVE_STIFFNESS_REDUCTION_HH__
#define __AKANTU_MATERIAL_ITERATIVE_STIFFNESS_REDUCTION_HH__
__BEGIN_AKANTU__
/**
* Material damage iterative
*
* parameters in the material files :
* - Gfx
* - h
* - Sc
*/
/// Proposed by Rots and Invernizzi, 2004: Regularized sequentially linear
// saw-tooth softening model (section 4.2)
template<UInt spatial_dimension>
class MaterialIterativeStiffnessReduction : public MaterialDamageIterative<spatial_dimension> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialIterativeStiffnessReduction(SolidMechanicsModel & model, const ID & id = "");
virtual ~MaterialIterativeStiffnessReduction() {};
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
/// init the material
virtual void initMaterial();
///compute the equivalent stress on each Gauss point (i.e. the max prinicpal stress) and normalize it by the tensile stiffness
virtual void computeNormalizedEquivalentStress(const Array<Real> & grad_u,
ElementType el_type, GhostType ghost_type = _not_ghost);
/// update internal field damage
virtual UInt updateDamage();
/* ------------------------------------------------------------------------ */
/* DataAccessor inherited members */
/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// the ultimate strain
InternalField<Real> eps_u;
/// the reduction
InternalField<UInt> reduction_step;
/// the tangent of the tensile stress-strain softening
InternalField<Real> D;
/// fracture energy
Real Gf;
/// crack_band_width for normalization of fracture energy
Real crack_band_width;
/// the number of total reductions steps until complete failure
UInt max_reductions;
/// the reduction constant (denoated by a in the paper of rots)
Real reduction_constant;
};
__END_AKANTU__
#endif /* __AKANTU_MATERIAL_ITERATIVE_STIFFNESS_REDUCTION_HH__ */
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