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material_viscoplastic.hh
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Wed, Aug 21, 16:32
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rAKA akantu
material_viscoplastic.hh
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/**
* @file material_viscoplastic.hh
*
* @author Ramin Aghababaei <ramin.aghababaei@epfl.ch>
*
*
* @brief Specialization of the material class for
* MaterialLinearIsotropicHardening to include viscous effects (small
* deformation)
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "material_plastic.hh"
#include "aka_voigthelper.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_VISCOPLASTIC_HH__
#define __AKANTU_MATERIAL_VISCOPLASTIC_HH__
__BEGIN_AKANTU__
/**
* Material plastic isotropic
*
* parameters in the material files :
* - h : Hardening parameter (default: 0)
* - sigmay : Yield stress
* - rate : Rate sensitivity
* - edot0 : Reference strain rate
*
* - ts: Time step
*/
template
<
UInt
spatial_dimension
>
class
MaterialViscoPlastic
:
public
MaterialPlastic
<
spatial_dimension
>
{
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public
:
MaterialViscoPlastic
(
SolidMechanicsModel
&
model
,
const
ID
&
id
=
""
);
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public
:
/// constitutive law for all element of a type
virtual
void
computeStress
(
ElementType
el_type
,
GhostType
ghost_type
=
_not_ghost
);
/// compute the tangent stiffness matrix for an element type
void
computeTangentModuli
(
const
ElementType
&
el_type
,
Array
<
Real
>
&
tangent_matrix
,
GhostType
ghost_type
=
_not_ghost
);
protected
:
inline
void
computeStressOnQuad
(
const
Matrix
<
Real
>
&
grad_u
,
const
Matrix
<
Real
>
&
previous_grad_u
,
Matrix
<
Real
>
&
sigma
,
const
Matrix
<
Real
>
&
previous_sigma
,
Matrix
<
Real
>
&
inelastic_strain
,
const
Matrix
<
Real
>
&
previous_inelastic_strain
,
Real
&
iso_hardening
)
const
;
inline
void
computeTangentModuliOnQuad
(
Matrix
<
Real
>
&
tangent
,
const
Matrix
<
Real
>
&
grad_u
,
const
Matrix
<
Real
>
&
previous_grad_u
,
const
Matrix
<
Real
>
&
sigma_tensor
,
const
Matrix
<
Real
>
&
previous_sigma_tensor
,
const
Real
&
iso_hardening
)
const
;
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public
:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private
:
/// Rate sensitivity component (rate)
Real
rate
;
/// Reference strain rate (edot0)
Real
edot0
;
/// Time step (ts)
Real
ts
;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
#include "material_viscoplastic_inline_impl.cc"
__END_AKANTU__
#endif
/* __AKANTU_MATERIAL_VISCOPLASTIC_HH__ */
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