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cohesive_extrinsic.cc
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rAKA akantu
cohesive_extrinsic.cc
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/**
* @file cohesive_extrinsic.cc
*
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Sun Oct 19 2014
*
* @brief Test for cohesive elements
*
* @section LICENSE
*
* Copyright (©) 2015 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 <iostream>
/* -------------------------------------------------------------------------- */
#include "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
int
main
(
int
argc
,
char
*
argv
[])
{
initialize
(
"material.dat"
,
argc
,
argv
);
const
UInt
spatial_dimension
=
2
;
const
UInt
max_steps
=
1000
;
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"triangle.msh"
);
SolidMechanicsModelCohesive
model
(
mesh
);
/// model initialization
model
.
initFull
(
SolidMechanicsModelCohesiveOptions
(
_explicit_lumped_mass
,
true
));
Real
time_step
=
model
.
getStableTimeStep
()
*
0.05
;
model
.
setTimeStep
(
time_step
);
std
::
cout
<<
"Time step: "
<<
time_step
<<
std
::
endl
;
CohesiveElementInserter
&
inserter
=
model
.
getElementInserter
();
inserter
.
setLimit
(
_y
,
0.30
,
0.20
);
model
.
updateAutomaticInsertion
();
Array
<
Real
>
&
position
=
mesh
.
getNodes
();
Array
<
Real
>
&
velocity
=
model
.
getVelocity
();
Array
<
bool
>
&
boundary
=
model
.
getBlockedDOFs
();
Array
<
Real
>
&
displacement
=
model
.
getDisplacement
();
UInt
nb_nodes
=
mesh
.
getNbNodes
();
/// boundary conditions
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
if
(
position
(
n
,
1
)
>
0.99
||
position
(
n
,
1
)
<
-
0.99
)
boundary
(
n
,
1
)
=
true
;
if
(
position
(
n
,
0
)
>
0.99
||
position
(
n
,
0
)
<
-
0.99
)
boundary
(
n
,
0
)
=
true
;
}
model
.
updateResidual
();
model
.
setBaseName
(
"extrinsic"
);
model
.
addDumpFieldVector
(
"displacement"
);
model
.
addDumpField
(
"velocity"
);
model
.
addDumpField
(
"acceleration"
);
model
.
addDumpField
(
"residual"
);
model
.
addDumpField
(
"stress"
);
model
.
addDumpField
(
"grad_u"
);
model
.
dump
();
/// initial conditions
Real
loading_rate
=
0.5
;
Real
disp_update
=
loading_rate
*
time_step
;
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
velocity
(
n
,
1
)
=
loading_rate
*
position
(
n
,
1
);
}
/// Main loop
for
(
UInt
s
=
1
;
s
<=
max_steps
;
++
s
)
{
/// update displacement on extreme nodes
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
if
(
position
(
n
,
1
)
>
0.99
||
position
(
n
,
1
)
<
-
0.99
)
displacement
(
n
,
1
)
+=
disp_update
*
position
(
n
,
1
);
}
model
.
checkCohesiveStress
();
model
.
explicitPred
();
model
.
updateResidual
();
model
.
updateAcceleration
();
model
.
explicitCorr
();
if
(
s
%
10
==
0
)
{
model
.
dump
();
std
::
cout
<<
"passing step "
<<
s
<<
"/"
<<
max_steps
<<
std
::
endl
;
}
}
Real
Ed
=
model
.
getEnergy
(
"dissipated"
);
Real
Edt
=
200
*
std
::
sqrt
(
2
);
std
::
cout
<<
Ed
<<
" "
<<
Edt
<<
std
::
endl
;
if
(
Ed
<
Edt
*
0.999
||
Ed
>
Edt
*
1.001
||
std
::
isnan
(
Ed
))
{
std
::
cout
<<
"The dissipated energy is incorrect"
<<
std
::
endl
;
return
EXIT_FAILURE
;
}
finalize
();
std
::
cout
<<
"OK: test_cohesive_extrinsic was passed!"
<<
std
::
endl
;
return
EXIT_SUCCESS
;
}
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