Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F74651532
material_standard_linear_solid_deviatoric.cc
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Sun, Jul 28, 23:00
Size
8 KB
Mime Type
text/x-c++
Expires
Tue, Jul 30, 23:00 (2 d)
Engine
blob
Format
Raw Data
Handle
19423321
Attached To
rAKA akantu
material_standard_linear_solid_deviatoric.cc
View Options
/**
* @file material_standard_linear_solid_deviatoric.cc
*
* @author David Simon Kammer <david.kammer@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Vladislav Yastrebov <vladislav.yastrebov@epfl.ch>
*
* @date creation: Wed May 04 2011
* @date last modification: Fri Apr 09 2021
*
* @brief Material Visco-elastic
*
*
* @section LICENSE
*
* Copyright (©) 2010-2021 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_standard_linear_solid_deviatoric.hh"
#include "solid_mechanics_model.hh"
namespace
akantu
{
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
MaterialStandardLinearSolidDeviatoric
<
dim
>::
MaterialStandardLinearSolidDeviatoric
(
SolidMechanicsModel
&
model
,
const
ID
&
id
)
:
MaterialElastic
<
dim
>
(
model
,
id
),
stress_dev
(
"stress_dev"
,
*
this
),
history_integral
(
"history_integral"
,
*
this
),
dissipated_energy
(
"dissipated_energy"
,
*
this
)
{
AKANTU_DEBUG_IN
();
this
->
registerParam
(
"Eta"
,
eta
,
Real
(
1.
),
_pat_parsable
|
_pat_modifiable
,
"Viscosity"
);
this
->
registerParam
(
"Ev"
,
Ev
,
Real
(
1.
),
_pat_parsable
|
_pat_modifiable
,
"Stiffness of the viscous element"
);
this
->
registerParam
(
"Einf"
,
E_inf
,
Real
(
1.
),
_pat_readable
,
"Stiffness of the elastic element"
);
UInt
stress_size
=
dim
*
dim
;
this
->
stress_dev
.
initialize
(
stress_size
);
this
->
history_integral
.
initialize
(
stress_size
);
this
->
dissipated_energy
.
initialize
(
1
);
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
void
MaterialStandardLinearSolidDeviatoric
<
dim
>::
initMaterial
()
{
AKANTU_DEBUG_IN
();
updateInternalParameters
();
MaterialElastic
<
dim
>::
initMaterial
();
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
void
MaterialStandardLinearSolidDeviatoric
<
dim
>::
updateInternalParameters
()
{
MaterialElastic
<
dim
>::
updateInternalParameters
();
E_inf
=
this
->
E
-
this
->
Ev
;
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
void
MaterialStandardLinearSolidDeviatoric
<
dim
>::
setToSteadyState
(
ElementType
el_type
,
GhostType
ghost_type
)
{
/// Loop on all quadrature points
for
(
auto
&&
args
:
this
->
getArguments
(
el_type
,
ghost_type
))
{
const
auto
&
grad_u
=
tuple
::
get
<
"grad_u"
_h
>
(
args
);
auto
&
dev_s
=
tuple
::
get
<
"sigma_dev"
_h
>
(
args
);
auto
&
h
=
tuple
::
get
<
"history"
_h
>
(
args
);
/// Compute the first invariant of strain
Real
Theta
=
grad_u
.
trace
();
dev_s
=
2
*
this
->
mu
*
((
grad_u
+
grad_u
.
transpose
())
/
2.
-
Theta
*
Matrix
<
Real
,
dim
,
dim
>::
Identity
()
/
3.
);
h
.
zero
();
}
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
void
MaterialStandardLinearSolidDeviatoric
<
dim
>::
computeStress
(
ElementType
el_type
,
GhostType
ghost_type
)
{
Real
tau
=
eta
/
Ev
;
Real
dt
=
this
->
model
.
getTimeStep
();
Real
exp_dt_tau
=
exp
(
-
dt
/
tau
);
Real
exp_dt_tau_2
=
exp
(
-
.5
*
dt
/
tau
);
Matrix
<
Real
,
dim
,
dim
>
s
;
Matrix
<
Real
,
dim
,
dim
>
epsilon_d
;
/// Loop on all quadrature points
for
(
auto
&&
args
:
this
->
getArguments
(
el_type
,
ghost_type
))
{
const
auto
&
grad_u
=
tuple
::
get
<
"grad_u"
_h
>
(
args
);
auto
&
sigma
=
tuple
::
get
<
"sigma"
_h
>
(
args
);
auto
&
dev_s
=
tuple
::
get
<
"sigma_dev"
_h
>
(
args
);
auto
&
h
=
tuple
::
get
<
"history"
_h
>
(
args
);
s
.
zero
();
sigma
.
zero
();
/// Compute the first invariant of strain
auto
gamma_inf
=
E_inf
/
this
->
E
;
auto
gamma_v
=
Ev
/
this
->
E
;
epsilon_d
=
this
->
template
gradUToEpsilon
<
dim
>
(
grad_u
);
auto
Theta
=
epsilon_d
.
trace
();
epsilon_d
-=
Matrix
<
Real
,
dim
,
dim
>::
Identity
()
*
epsilon_d
.
trace
()
/
3.
;
Matrix
<
Real
,
dim
,
dim
>
U_rond_prim
=
Matrix
<
Real
,
dim
,
dim
>::
Identity
()
*
gamma_inf
*
this
->
kpa
*
Theta
;
s
=
this
->
mu
*
epsilon_d
;
h
=
exp_dt_tau
*
h
+
exp_dt_tau_2
*
(
s
-
dev_s
);
dev_s
=
s
;
sigma
=
U_rond_prim
+
gamma_inf
*
s
+
gamma_v
*
h
;
}
this
->
updateDissipatedEnergy
(
el_type
,
ghost_type
);
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
void
MaterialStandardLinearSolidDeviatoric
<
dim
>::
updateDissipatedEnergy
(
ElementType
el_type
,
GhostType
ghost_type
)
{
Real
tau
=
eta
/
Ev
;
Matrix
<
Real
,
dim
,
dim
>
q
;
Matrix
<
Real
,
dim
,
dim
>
q_rate
;
Matrix
<
Real
,
dim
,
dim
>
epsilon_d
;
auto
dt
=
this
->
model
.
getTimeStep
();
auto
gamma_v
=
Ev
/
this
->
E
;
auto
alpha
=
1.
/
(
2.
*
this
->
mu
*
gamma_v
);
for
(
auto
&&
data
:
zip
(
this
->
getArguments
(
el_type
,
ghost_type
),
dissipated_energy
(
el_type
,
ghost_type
)))
{
auto
&&
args
=
std
::
get
<
0
>
(
data
);
auto
&
dis_energy
=
std
::
get
<
1
>
(
data
);
const
auto
&
grad_u
=
tuple
::
get
<
"grad_u"
_h
>
(
args
);
auto
&
sigma
=
tuple
::
get
<
"sigma"
_h
>
(
args
);
auto
&
dev_s
=
tuple
::
get
<
"sigma_dev"
_h
>
(
args
);
auto
&
h
=
tuple
::
get
<
"history"
_h
>
(
args
);
/// Compute the first invariant of strain
epsilon_d
=
Material
::
gradUToEpsilon
<
dim
>
(
grad_u
);
auto
Theta
=
epsilon_d
.
trace
();
epsilon_d
-=
Matrix
<
Real
,
dim
,
dim
>::
Identity
()
*
Theta
/
3.
;
q
=
(
dev_s
-
h
)
*
gamma_v
;
q_rate
=
(
dev_s
*
gamma_v
-
q
)
/
tau
;
dis_energy
+=
((
epsilon_d
-
alpha
*
q
)
*
q_rate
*
dt
).
sum
();
}
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
Real
MaterialStandardLinearSolidDeviatoric
<
dim
>::
getDissipatedEnergy
()
const
{
AKANTU_DEBUG_IN
();
Real
de
=
0.
;
/// integrate the dissipated energy for each type of elements
for
(
const
auto
&
type
:
this
->
element_filter
.
elementTypes
(
dim
,
_not_ghost
))
{
de
+=
this
->
fem
.
integrate
(
dissipated_energy
(
type
,
_not_ghost
),
type
,
_not_ghost
,
this
->
element_filter
(
type
,
_not_ghost
));
}
AKANTU_DEBUG_OUT
();
return
de
;
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
Real
MaterialStandardLinearSolidDeviatoric
<
dim
>::
getDissipatedEnergy
(
const
Element
&
element
)
const
{
AKANTU_DEBUG_IN
();
auto
nb_quadrature_points
=
this
->
fem
.
getNbIntegrationPoints
(
element
.
type
);
auto
it
=
this
->
dissipated_energy
(
element
.
type
,
_not_ghost
)
.
begin
(
nb_quadrature_points
);
auto
gindex
=
this
->
element_filter
(
element
);
AKANTU_DEBUG_OUT
();
return
this
->
fem
.
integrate
(
it
[
element
.
element
],
element
);
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
Real
MaterialStandardLinearSolidDeviatoric
<
dim
>::
getEnergy
(
const
std
::
string
&
type
)
{
if
(
type
==
"dissipated"
)
{
return
getDissipatedEnergy
();
}
if
(
type
==
"dissipated_sls_deviatoric"
)
{
return
getDissipatedEnergy
();
}
return
MaterialElastic
<
dim
>::
getEnergy
(
type
);
}
/* -------------------------------------------------------------------------- */
template
<
Int
dim
>
Real
MaterialStandardLinearSolidDeviatoric
<
dim
>::
getEnergy
(
const
std
::
string
&
energy_id
,
const
Element
&
element
)
{
if
(
energy_id
==
"dissipated"
)
{
return
getDissipatedEnergy
(
element
);
}
if
(
energy_id
==
"dissipated_sls_deviatoric"
)
{
return
getDissipatedEnergy
(
element
);
}
return
Parent
::
getEnergy
(
energy_id
,
element
);
}
/* -------------------------------------------------------------------------- */
INSTANTIATE_MATERIAL
(
sls_deviatoric
,
MaterialStandardLinearSolidDeviatoric
);
}
// namespace akantu
Event Timeline
Log In to Comment