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test_structural_mechanics_model_bernoulli_beam_2_complicated.cc
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Tue, Sep 10, 18:40
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rAKA akantu
test_structural_mechanics_model_bernoulli_beam_2_complicated.cc
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/**
* @file test_structural_mechanics_model_bernoulli_beam_2_complicated.cc
*
* @author Fabian Barras <fabian.barras@epfl.ch>
*
* @date creation: Fri Jul 15 2011
* @date last modification: Thu Jun 12 2014
*
* @brief A very complicated structure
*
* @section LICENSE
*
* Copyright (©) 2014 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 <limits>
#include <fstream>
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "mesh_io_msh_struct.hh"
#include "structural_mechanics_model.hh"
#include "material.hh"
/* -------------------------------------------------------------------------- */
#define TYPE _bernoulli_beam_2
using
namespace
akantu
;
//Linear load function
static
void
lin_load
(
double
*
position
,
double
*
load
,
__attribute__
((
unused
))
Real
*
normal
,
__attribute__
((
unused
))
UInt
surface_id
){
memset
(
load
,
0
,
sizeof
(
Real
)
*
3
);
if
(
position
[
1
]
>=
0.
-
Math
::
getTolerance
())
{
if
((
position
[
0
]
<=
10.
)){
load
[
1
]
=
-
100
;
}
else
if
(
position
[
0
]
<=
20.
){
load
[
1
]
=
-
70
;
}
}
}
int
main
(
int
argc
,
char
*
argv
[]){
initialize
(
argc
,
argv
);
Mesh
beams
(
2
);
debug
::
setDebugLevel
(
dblWarning
);
/* -------------------------------------------------------------------------- */
// Defining the mesh
akantu
::
MeshIOMSHStruct
mesh_io
;
mesh_io
.
read
(
"complicated.msh"
,
beams
);
/* -------------------------------------------------------------------------- */
// Defining the material
const
akantu
::
ElementType
type
=
akantu
::
_bernoulli_beam_2
;
akantu
::
StructuralMechanicsModel
model
(
beams
);
StructuralMaterial
mat1
;
mat1
.
E
=
3e10
;
mat1
.
I
=
0.0025
;
mat1
.
A
=
0.01
;
model
.
addMaterial
(
mat1
);
StructuralMaterial
mat2
;
mat2
.
E
=
3e10
;
mat2
.
I
=
0.003125
;
mat2
.
A
=
0.01
;
model
.
addMaterial
(
mat2
);
/* -------------------------------------------------------------------------- */
// Defining the forces
model
.
initFull
();
UInt
nb_element
=
beams
.
getNbElement
(
type
);
for
(
unsigned
int
i
=
0
;
i
<
nb_element
;
++
i
)
{
model
.
getElementMaterial
(
type
)(
i
,
0
)
=
beams
.
getData
<
UInt
>
(
"tag_0"
,
type
)(
i
,
0
)
-
1
;
}
Array
<
Real
>
&
forces
=
model
.
getForce
();
Array
<
Real
>
&
displacement
=
model
.
getDisplacement
();
Array
<
bool
>
&
boundary
=
model
.
getBlockedDOFs
();
forces
.
clear
();
displacement
.
clear
();
model
.
computeForcesFromFunction
<
_bernoulli_beam_2
>
(
lin_load
,
akantu
::
_bft_traction
);
/* -------------------------------------------------------------------------- */
// Defining the boundary conditions
boundary
(
0
,
0
)
=
true
;
boundary
(
0
,
1
)
=
true
;
boundary
(
3
,
0
)
=
true
;
boundary
(
3
,
1
)
=
true
;
boundary
(
4
,
0
)
=
true
;
boundary
(
4
,
1
)
=
true
;
boundary
(
4
,
2
)
=
true
;
boundary
(
5
,
0
)
=
true
;
boundary
(
5
,
1
)
=
true
;
boundary
(
5
,
2
)
=
true
;
boundary
(
2
,
1
)
=
true
;
boundary
(
2
,
0
)
=
true
;
boundary
(
1
,
1
)
=
true
;
boundary
(
1
,
0
)
=
true
;
/* -------------------------------------------------------------------------- */
// Solve
Real
error
;
model
.
assembleStiffnessMatrix
();
model
.
getStiffnessMatrix
().
saveMatrix
(
"Kb.mtx"
);
UInt
count
=
0
;
model
.
addDumpFieldVector
(
"displacement"
);
model
.
addDumpField
(
"rotation"
);
model
.
addDumpField
(
"force"
);
model
.
addDumpField
(
"momentum"
);
do
{
if
(
count
!=
0
)
std
::
cerr
<<
count
<<
" - "
<<
error
<<
std
::
endl
;
model
.
updateResidual
();
model
.
solve
();
count
++
;
}
while
(
!
model
.
testConvergenceIncrement
(
1e-10
,
error
)
&&
count
<
10
);
std
::
cerr
<<
count
<<
" - "
<<
error
<<
std
::
endl
;
/* -------------------------------------------------------------------------- */
// Post-Processing
model
.
computeStresses
();
model
.
getStiffnessMatrix
().
saveMatrix
(
"Ka.mtx"
);
std
::
cout
<<
" x1 = "
<<
displacement
(
1
,
2
)
<<
std
::
endl
;
std
::
cout
<<
" x2 = "
<<
displacement
(
2
,
2
)
<<
std
::
endl
;
model
.
dump
();
}
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