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isotropic_hardening.cpp
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rTAMAAS tamaas
isotropic_hardening.cpp
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-2020 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "isotropic_hardening.hh"
#include "influence.hh"
/* -------------------------------------------------------------------------- */
namespace
tamaas
{
/* -------------------------------------------------------------------------- */
template
<
model_type
type
>
IsotropicHardening
<
type
>::
IsotropicHardening
(
Model
*
model
,
Real
sigma_0
,
Real
h
)
:
model
(
model
),
sigma_0
(
sigma_0
),
h
(
h
)
{
plastic_strain
=
allocateGrid
<
type
,
false
,
Real
>
(
model
->
getDiscretization
(),
trait
::
voigt
);
cumulated_plastic_strain
=
allocateGrid
<
type
,
false
,
Real
>
(
model
->
getDiscretization
(),
1
);
model
->
registerField
(
"plastic_strain"
,
plastic_strain
);
model
->
registerField
(
"cumulated_plastic_strain"
,
cumulated_plastic_strain
);
}
/* -------------------------------------------------------------------------- */
template
<>
void
IsotropicHardening
<
model_type
::
volume_2d
>::
applyTangentIncrement
(
Grid
<
Real
,
dim
>&
output
,
const
Grid
<
Real
,
dim
>&
input
,
const
Grid
<
Real
,
dim
>&
strain
,
const
Grid
<
Real
,
dim
>&
strain_increment
)
const
{
const
influence
::
ElasticHelper
<
dim
>
elasticity
(
this
->
model
->
getShearModulus
(),
this
->
model
->
getPoissonRatio
());
using
pmatrix
=
SymMatrixProxy
<
Real
,
dim
>
;
using
cpmatrix
=
SymMatrixProxy
<
const
Real
,
dim
>
;
Loop
::
loop
(
[
&
elasticity
,
this
](
auto
out
,
auto
in
,
auto
epsilon
,
auto
delta_epsilon
,
auto
ep
,
const
Real
&
p
)
{
auto
sigma_tr
=
elasticity
(
epsilon
-
ep
+
delta_epsilon
);
decltype
(
sigma_tr
)
dev
;
dev
.
deviatoric
(
sigma_tr
,
3
);
auto
von_mises
=
std
::
sqrt
(
1.5
)
*
dev
.
l2norm
();
if
(
von_mises
-
this
->
hardening
(
p
)
>
0
)
{
Real
dp
=
(
von_mises
-
this
->
hardening
(
p
))
/
(
3
*
elasticity
.
mu
+
h
);
// Applying tangent from Bonnet & Frangi, p.175
const
Real
beta
=
3
*
elasticity
.
mu
*
dp
/
von_mises
;
const
Real
gamma
=
3
*
elasticity
.
mu
/
(
3
*
elasticity
.
mu
+
this
->
h
);
const
Real
dot
=
dev
.
dot
(
in
);
dev
*=
3
*
elasticity
.
mu
*
(
gamma
-
beta
)
*
dot
/
(
von_mises
*
von_mises
);
out
.
deviatoric
(
in
);
out
*=
2
*
elasticity
.
mu
*
beta
;
out
+=
dev
;
}
else
out
=
0
;
},
range
<
pmatrix
>
(
output
),
range
<
cpmatrix
>
(
input
),
range
<
cpmatrix
>
(
strain
),
range
<
cpmatrix
>
(
strain_increment
),
range
<
cpmatrix
>
(
*
this
->
plastic_strain
),
*
this
->
cumulated_plastic_strain
);
}
/* -------------------------------------------------------------------------- */
/* Template instanciation */
/* -------------------------------------------------------------------------- */
template
class
IsotropicHardening
<
model_type
::
volume_2d
>
;
}
// namespace tamaas
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