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material_igfem_iterative_stiffness_reduction.hh
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Tue, Aug 27, 20:35
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rAKA akantu
material_igfem_iterative_stiffness_reduction.hh
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/**
* @file material_igfem_iterative_stiffness_reduction.hh
* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
* @date Wed Mar 9 19:44:22 2016
*
* @brief Material for iterative stiffness reduction by contant factor
*
*
* 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_igfem_saw_tooth_damage.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MATERIAL_IGFEM_ITERATIVE_STIFFNESS_REDUCTION_HH_
#define AKANTU_MATERIAL_IGFEM_ITERATIVE_STIFFNESS_REDUCTION_HH_
namespace
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
MaterialIGFEMIterativeStiffnessReduction
:
public
MaterialIGFEMSawToothDamage
<
spatial_dimension
>
{
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public
:
MaterialIGFEMIterativeStiffnessReduction
(
SolidMechanicsModel
&
model
,
const
ID
&
id
=
""
);
virtual
~
MaterialIGFEMIterativeStiffnessReduction
(){};
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public
:
/// set the material parameters
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
();
virtual
void
onElementsAdded
(
const
Array
<
Element
>
&
element_list
,
const
NewElementsEvent
&
event
);
/* ------------------------------------------------------------------------ */
/* DataAccessor inherited members */
/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public
:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected
:
/// the ultimate strain
IGFEMInternalField
<
Real
>
eps_u
;
/// the reduction
IGFEMInternalField
<
UInt
>
reduction_step
;
/// the tangent of the tensile stress-strain softening
IGFEMInternalField
<
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
;
};
}
// namespace akantu
#endif
/* AKANTU_MATERIAL_IGFEM_ITERATIVE_STIFFNESS_REDUCTION_HH_ */
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