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test_material_mazars.cc
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rAKA akantu
test_material_mazars.cc
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/**
* @file test_material_mazars.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Clement Roux <clement.roux@epfl.ch>
*
* @date creation: Thu Oct 08 2015
* @date last modification: Wed Jun 05 2019
*
* @brief test for material mazars, dissymmetric
*
*
* @section LICENSE
*
* Copyright (©) 2015-2021 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 "mesh_accessor.hh"
#include "solid_mechanics_model.hh"
/* -------------------------------------------------------------------------- */
#include <fstream>
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
/* -------------------------------------------------------------------------- */
int
main
(
int
argc
,
char
*
argv
[])
{
debug
::
setDebugLevel
(
akantu
::
dblWarning
);
akantu
::
initialize
(
"material_mazars.dat"
,
argc
,
argv
);
const
UInt
spatial_dimension
=
3
;
// ElementType type = _quadrangle_4;
ElementType
type
=
_hexahedron_8
;
Mesh
mesh
(
spatial_dimension
);
MeshAccessor
mesh_accessor
(
mesh
);
Array
<
Real
>
&
nodes
=
mesh_accessor
.
getNodes
();
Array
<
UInt
>
&
connectivity
=
mesh_accessor
.
getConnectivity
(
type
);
const
Real
width
=
1
;
UInt
nb_dof
=
0
;
connectivity
.
resize
(
1
);
if
(
type
==
_hexahedron_8
)
{
nb_dof
=
8
;
nodes
.
resize
(
nb_dof
);
nodes
(
0
,
0
)
=
0.
;
nodes
(
0
,
1
)
=
0.
;
nodes
(
0
,
2
)
=
0.
;
nodes
(
1
,
0
)
=
width
;
nodes
(
1
,
1
)
=
0.
;
nodes
(
1
,
2
)
=
0.
;
nodes
(
2
,
0
)
=
width
;
nodes
(
2
,
1
)
=
width
;
nodes
(
2
,
2
)
=
0
;
nodes
(
3
,
0
)
=
0
;
nodes
(
3
,
1
)
=
width
;
nodes
(
3
,
2
)
=
0
;
nodes
(
4
,
0
)
=
0.
;
nodes
(
4
,
1
)
=
0.
;
nodes
(
4
,
2
)
=
width
;
nodes
(
5
,
0
)
=
width
;
nodes
(
5
,
1
)
=
0.
;
nodes
(
5
,
2
)
=
width
;
nodes
(
6
,
0
)
=
width
;
nodes
(
6
,
1
)
=
width
;
nodes
(
6
,
2
)
=
width
;
nodes
(
7
,
0
)
=
0
;
nodes
(
7
,
1
)
=
width
;
nodes
(
7
,
2
)
=
width
;
connectivity
(
0
,
0
)
=
0
;
connectivity
(
0
,
1
)
=
1
;
connectivity
(
0
,
2
)
=
2
;
connectivity
(
0
,
3
)
=
3
;
connectivity
(
0
,
4
)
=
4
;
connectivity
(
0
,
5
)
=
5
;
connectivity
(
0
,
6
)
=
6
;
connectivity
(
0
,
7
)
=
7
;
}
else
if
(
type
==
_quadrangle_4
)
{
nb_dof
=
4
;
nodes
.
resize
(
nb_dof
);
nodes
(
0
,
0
)
=
0.
;
nodes
(
0
,
1
)
=
0.
;
nodes
(
1
,
0
)
=
width
;
nodes
(
1
,
1
)
=
0
;
nodes
(
2
,
0
)
=
width
;
nodes
(
2
,
1
)
=
width
;
nodes
(
3
,
0
)
=
0.
;
nodes
(
3
,
1
)
=
width
;
connectivity
(
0
,
0
)
=
0
;
connectivity
(
0
,
1
)
=
1
;
connectivity
(
0
,
2
)
=
2
;
connectivity
(
0
,
3
)
=
3
;
}
mesh_accessor
.
makeReady
();
SolidMechanicsModel
model
(
mesh
);
model
.
initFull
();
Material
&
mat
=
model
.
getMaterial
(
0
);
std
::
cout
<<
mat
<<
std
::
endl
;
/// boundary conditions
Array
<
Real
>
&
disp
=
model
.
getDisplacement
();
Array
<
Real
>
&
velo
=
model
.
getVelocity
();
Array
<
bool
>
&
boun
=
model
.
getBlockedDOFs
();
for
(
UInt
i
=
0
;
i
<
nb_dof
;
++
i
)
{
boun
(
i
,
0
)
=
true
;
}
Real
time_step
=
model
.
getStableTimeStep
()
*
.5
;
// Real time_step = 1e-5;
std
::
cout
<<
"Time Step = "
<<
time_step
<<
"s - nb elements : "
<<
mesh
.
getNbElement
(
type
)
<<
std
::
endl
;
model
.
setTimeStep
(
time_step
);
std
::
ofstream
energy
;
energy
.
open
(
"energies_and_scalar_mazars.csv"
);
energy
<<
"id,rtime,epot,ekin,u,wext,kin+pot,D,strain_xx,strain_yy,stress_xx,"
"stress_yy,edis,tot"
<<
std
::
endl
;
/// Set dumper
model
.
setBaseName
(
"uniaxial_comp-trac_mazars"
);
model
.
addDumpFieldVector
(
"displacement"
);
model
.
addDumpField
(
"velocity"
);
model
.
addDumpField
(
"acceleration"
);
model
.
addDumpField
(
"damage"
);
model
.
addDumpField
(
"strain"
);
model
.
addDumpField
(
"stress"
);
model
.
addDumpField
(
"partitions"
);
model
.
dump
();
const
Array
<
Real
>
&
strain
=
mat
.
getGradU
(
type
);
const
Array
<
Real
>
&
stress
=
mat
.
getStress
(
type
);
const
Array
<
Real
>
&
damage
=
mat
.
getArray
<
Real
>
(
"damage"
,
type
);
/* ------------------------------------------------------------------------ */
/* Main loop */
/* ------------------------------------------------------------------------ */
Real
wext
=
0.
;
Real
sigma_max
=
0
,
sigma_min
=
0
;
Real
max_disp
;
Real
stress_xx_compression_1
;
UInt
nb_steps
=
7e5
/
150
;
Real
adisp
=
0
;
for
(
UInt
s
=
0
;
s
<
nb_steps
;
++
s
)
{
if
(
s
==
0
)
{
max_disp
=
0.003
;
adisp
=
-
(
max_disp
*
8.
/
nb_steps
)
/
2.
;
std
::
cout
<<
"Step "
<<
s
<<
" compression: "
<<
max_disp
<<
std
::
endl
;
}
if
(
s
==
(
2
*
nb_steps
/
8
))
{
stress_xx_compression_1
=
stress
(
0
,
0
);
max_disp
=
0
+
max_disp
;
adisp
=
max_disp
*
8.
/
nb_steps
;
std
::
cout
<<
"Step "
<<
s
<<
" discharge"
<<
std
::
endl
;
}
if
(
s
==
(
3
*
nb_steps
/
8
))
{
max_disp
=
0.004
;
adisp
=
-
max_disp
*
8.
/
nb_steps
;
std
::
cout
<<
"Step "
<<
s
<<
" compression: "
<<
max_disp
<<
std
::
endl
;
}
if
(
s
==
(
4
*
nb_steps
/
8
))
{
if
(
stress
(
0
,
0
)
<
stress_xx_compression_1
)
{
std
::
cout
<<
"after this second compression step softening should have "
"started"
<<
std
::
endl
;
return
EXIT_FAILURE
;
}
max_disp
=
0.0015
+
max_disp
;
adisp
=
max_disp
*
8.
/
nb_steps
;
std
::
cout
<<
"Step "
<<
s
<<
" discharge tension: "
<<
max_disp
<<
std
::
endl
;
}
if
(
s
==
(
5
*
nb_steps
/
8
))
{
max_disp
=
0.
+
0.0005
;
adisp
=
-
max_disp
*
8.
/
nb_steps
;
std
::
cout
<<
"Step "
<<
s
<<
" discharge"
<<
std
::
endl
;
}
if
(
s
==
(
6
*
nb_steps
/
8
))
{
max_disp
=
0.0035
-
0.001
;
adisp
=
max_disp
*
8.
/
nb_steps
;
std
::
cout
<<
"Step "
<<
s
<<
" tension: "
<<
max_disp
<<
std
::
endl
;
}
if
(
s
==
(
7
*
nb_steps
/
8
))
{
// max_disp = max_disp;
adisp
=
-
max_disp
*
8.
/
nb_steps
;
std
::
cout
<<
"Step "
<<
s
<<
" discharge"
<<
std
::
endl
;
}
for
(
UInt
i
=
0
;
i
<
nb_dof
;
++
i
)
{
if
(
std
::
abs
(
nodes
(
i
,
0
)
-
width
)
<
std
::
numeric_limits
<
Real
>::
epsilon
())
{
disp
(
i
,
0
)
+=
adisp
;
velo
(
i
,
0
)
=
adisp
/
time_step
;
}
}
std
::
cout
<<
"S: "
<<
s
<<
"/"
<<
nb_steps
<<
" inc disp: "
<<
adisp
<<
" disp: "
<<
std
::
setw
(
5
)
<<
disp
(
2
,
0
)
<<
"
\r
"
<<
std
::
flush
;
model
.
solveStep
();
Real
epot
=
model
.
getEnergy
(
"potential"
);
Real
ekin
=
model
.
getEnergy
(
"kinetic"
);
Real
edis
=
model
.
getEnergy
(
"dissipated"
);
wext
+=
model
.
getEnergy
(
"external work"
);
sigma_max
=
std
::
max
(
sigma_max
,
stress
(
0
,
0
));
sigma_min
=
std
::
min
(
sigma_min
,
stress
(
0
,
0
));
if
(
s
%
10
==
0
)
energy
<<
s
<<
","
// 1
<<
s
*
time_step
<<
","
// 2
<<
epot
<<
","
// 3
<<
ekin
<<
","
// 4
<<
disp
(
2
,
0
)
<<
","
// 5
<<
wext
<<
","
// 6
<<
epot
+
ekin
<<
","
// 7
<<
damage
(
0
)
<<
","
// 8
<<
strain
(
0
,
0
)
<<
","
// 9
<<
strain
(
0
,
3
)
<<
","
// 11
<<
stress
(
0
,
0
)
<<
","
// 10
<<
stress
(
0
,
3
)
<<
","
// 10
<<
edis
<<
","
// 12
<<
epot
+
ekin
+
edis
// 13
<<
std
::
endl
;
if
(
s
%
100
==
0
)
model
.
dump
();
}
std
::
cout
<<
std
::
endl
<<
"sigma_max = "
<<
sigma_max
<<
", sigma_min = "
<<
sigma_min
<<
std
::
endl
;
/// Verif the maximal/minimal stress values
if
((
std
::
abs
(
sigma_max
)
>
std
::
abs
(
sigma_min
))
or
(
std
::
abs
(
sigma_max
-
6.24e6
)
>
1e5
)
or
(
std
::
abs
(
sigma_min
+
2.943e7
)
>
1e6
))
return
EXIT_FAILURE
;
energy
.
close
();
akantu
::
finalize
();
return
EXIT_SUCCESS
;
}
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