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material_plastic.cc
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rAKA akantu
material_plastic.cc
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/**
* @file material_plastic.cc
*
* @author Lucas Frerot <lucas.frerot@epfl.ch>
* @author Daniel Pino Muñoz <daniel.pinomunoz@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Mon Apr 07 2014
* @date last modification: Sun Dec 03 2017
*
* @brief Implemantation of the akantu::MaterialPlastic class
*
*
* Copyright (©) 2014-2018 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_plastic.hh"
/* -------------------------------------------------------------------------- */
namespace
akantu
{
/* -------------------------------------------------------------------------- */
template
<
UInt
spatial_dimension
>
MaterialPlastic
<
spatial_dimension
>::
MaterialPlastic
(
SolidMechanicsModel
&
model
,
const
ID
&
id
)
:
MaterialElastic
<
spatial_dimension
>
(
model
,
id
),
iso_hardening
(
"iso_hardening"
,
*
this
),
inelastic_strain
(
"inelastic_strain"
,
*
this
),
plastic_energy
(
"plastic_energy"
,
*
this
),
d_plastic_energy
(
"d_plastic_energy"
,
*
this
)
{
AKANTU_DEBUG_IN
();
this
->
initialize
();
AKANTU_DEBUG_OUT
();
}
template
<
UInt
spatial_dimension
>
MaterialPlastic
<
spatial_dimension
>::
MaterialPlastic
(
SolidMechanicsModel
&
model
,
UInt
dim
,
const
Mesh
&
mesh
,
FEEngine
&
fe_engine
,
const
ID
&
id
)
:
MaterialElastic
<
spatial_dimension
>
(
model
,
dim
,
mesh
,
fe_engine
,
id
),
iso_hardening
(
"iso_hardening"
,
*
this
,
dim
,
fe_engine
,
this
->
element_filter
),
inelastic_strain
(
"inelastic_strain"
,
*
this
,
dim
,
fe_engine
,
this
->
element_filter
),
plastic_energy
(
"plastic_energy"
,
*
this
,
dim
,
fe_engine
,
this
->
element_filter
),
d_plastic_energy
(
"d_plastic_energy"
,
*
this
,
dim
,
fe_engine
,
this
->
element_filter
)
{
AKANTU_DEBUG_IN
();
this
->
initialize
();
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
template
<
UInt
spatial_dimension
>
void
MaterialPlastic
<
spatial_dimension
>::
initialize
()
{
this
->
registerParam
(
"h"
,
h
,
Real
(
0.
),
_pat_parsable
|
_pat_modifiable
,
"Hardening modulus"
);
this
->
registerParam
(
"sigma_y"
,
sigma_y
,
Real
(
0.
),
_pat_parsable
|
_pat_modifiable
,
"Yield stress"
);
this
->
iso_hardening
.
initialize
(
1
);
this
->
iso_hardening
.
initializeHistory
();
this
->
plastic_energy
.
initialize
(
1
);
this
->
d_plastic_energy
.
initialize
(
1
);
this
->
use_previous_stress
=
true
;
this
->
use_previous_gradu
=
true
;
this
->
use_previous_stress_thermal
=
true
;
this
->
inelastic_strain
.
initialize
(
spatial_dimension
*
spatial_dimension
);
this
->
inelastic_strain
.
initializeHistory
();
}
/* -------------------------------------------------------------------------- */
template
<
UInt
spatial_dimension
>
Real
MaterialPlastic
<
spatial_dimension
>::
getEnergy
(
const
std
::
string
&
type
)
{
if
(
type
==
"plastic"
)
{
return
getPlasticEnergy
();
}
return
MaterialElastic
<
spatial_dimension
>::
getEnergy
(
type
);
}
/* -------------------------------------------------------------------------- */
template
<
UInt
spatial_dimension
>
Real
MaterialPlastic
<
spatial_dimension
>::
getPlasticEnergy
()
{
AKANTU_DEBUG_IN
();
Real
penergy
=
0.
;
for
(
auto
&
type
:
this
->
element_filter
.
elementTypes
(
spatial_dimension
,
_not_ghost
))
{
penergy
+=
this
->
fem
.
integrate
(
plastic_energy
(
type
,
_not_ghost
),
type
,
_not_ghost
,
this
->
element_filter
(
type
,
_not_ghost
));
}
AKANTU_DEBUG_OUT
();
return
penergy
;
}
/* -------------------------------------------------------------------------- */
template
<
UInt
spatial_dimension
>
void
MaterialPlastic
<
spatial_dimension
>::
computePotentialEnergy
(
ElementType
el_type
)
{
AKANTU_DEBUG_IN
();
Array
<
Real
>::
scalar_iterator
epot
=
this
->
potential_energy
(
el_type
).
begin
();
Array
<
Real
>::
const_iterator
<
Matrix
<
Real
>>
inelastic_strain_it
=
this
->
inelastic_strain
(
el_type
).
begin
(
spatial_dimension
,
spatial_dimension
);
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN
(
el_type
,
_not_ghost
);
Matrix
<
Real
>
elastic_strain
(
spatial_dimension
,
spatial_dimension
);
elastic_strain
.
copy
(
grad_u
);
elastic_strain
-=
*
inelastic_strain_it
;
MaterialElastic
<
spatial_dimension
>::
computePotentialEnergyOnQuad
(
elastic_strain
,
sigma
,
*
epot
);
++
epot
;
++
inelastic_strain_it
;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END
;
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
template
<
UInt
spatial_dimension
>
void
MaterialPlastic
<
spatial_dimension
>::
updateEnergies
(
ElementType
el_type
)
{
AKANTU_DEBUG_IN
();
MaterialElastic
<
spatial_dimension
>::
updateEnergies
(
el_type
);
Array
<
Real
>::
iterator
<>
pe_it
=
this
->
plastic_energy
(
el_type
).
begin
();
Array
<
Real
>::
iterator
<>
wp_it
=
this
->
d_plastic_energy
(
el_type
).
begin
();
Array
<
Real
>::
iterator
<
Matrix
<
Real
>>
inelastic_strain_it
=
this
->
inelastic_strain
(
el_type
).
begin
(
spatial_dimension
,
spatial_dimension
);
Array
<
Real
>::
iterator
<
Matrix
<
Real
>>
previous_inelastic_strain_it
=
this
->
inelastic_strain
.
previous
(
el_type
).
begin
(
spatial_dimension
,
spatial_dimension
);
Array
<
Real
>::
matrix_iterator
previous_sigma
=
this
->
stress
.
previous
(
el_type
).
begin
(
spatial_dimension
,
spatial_dimension
);
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN
(
el_type
,
_not_ghost
);
Matrix
<
Real
>
delta_strain_it
(
*
inelastic_strain_it
);
delta_strain_it
-=
*
previous_inelastic_strain_it
;
Matrix
<
Real
>
sigma_h
(
sigma
);
sigma_h
+=
*
previous_sigma
;
*
wp_it
=
.5
*
sigma_h
.
doubleDot
(
delta_strain_it
);
*
pe_it
+=
*
wp_it
;
++
pe_it
;
++
wp_it
;
++
inelastic_strain_it
;
++
previous_inelastic_strain_it
;
++
previous_sigma
;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END
;
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
INSTANTIATE_MATERIAL_ONLY
(
MaterialPlastic
);
}
// namespace akantu
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