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test_cohesive_1d_element.cc
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rAKA akantu
test_cohesive_1d_element.cc
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/**
* @file test_cohesive_1d_element.cc
*
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Fri Jun 14 2013
* @date last modification: Mon Jun 23 2014
*
* @brief Test for 1D cohesive elements
*
* @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 "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
int
main
(
int
argc
,
char
*
argv
[])
{
initialize
(
"material.dat"
,
argc
,
argv
);
const
UInt
max_steps
=
2000
;
const
Real
strain_rate
=
4
;
UInt
spatial_dimension
=
1
;
Mesh
mesh
(
spatial_dimension
,
"mesh"
);
mesh
.
read
(
"bar.msh"
);
SolidMechanicsModelCohesive
model
(
mesh
);
model
.
initFull
(
SolidMechanicsModelCohesiveOptions
(
_explicit_lumped_mass
,
true
));
Real
time_step
=
model
.
getStableTimeStep
()
*
0.01
;
model
.
setTimeStep
(
time_step
);
std
::
cout
<<
"Time step: "
<<
time_step
<<
std
::
endl
;
model
.
assembleMassLumped
();
mesh
.
computeBoundingBox
();
Real
posx_max
=
mesh
.
getUpperBounds
()(
0
);
Real
posx_min
=
mesh
.
getLowerBounds
()(
0
);
/// initial conditions
Array
<
Real
>
&
velocity
=
model
.
getVelocity
();
const
Array
<
Real
>
&
position
=
mesh
.
getNodes
();
UInt
nb_nodes
=
mesh
.
getNbNodes
();
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
velocity
(
n
)
=
strain_rate
*
(
position
(
n
)
-
(
posx_max
+
posx_min
)
/
2.
);
/// boundary conditions
Array
<
bool
>
&
boundary
=
model
.
getBlockedDOFs
();
Array
<
Real
>
&
displacement
=
model
.
getDisplacement
();
Real
disp_increment
=
strain_rate
*
(
posx_max
-
posx_min
)
/
2.
*
time_step
;
for
(
UInt
node
=
0
;
node
<
mesh
.
getNbNodes
();
++
node
)
{
if
(
Math
::
are_float_equal
(
position
(
node
),
posx_min
))
{
// left side
boundary
(
node
)
=
true
;
}
if
(
Math
::
are_float_equal
(
position
(
node
),
posx_max
))
{
// right side
boundary
(
node
)
=
true
;
}
}
model
.
synchronizeBoundaries
();
model
.
updateResidual
();
// model.setBaseName("extrinsic_parallel");
// model.addDumpFieldVector("displacement");
// model.addDumpField("velocity" );
// model.addDumpField("acceleration");
// model.addDumpField("residual" );
// model.addDumpField("stress");
// model.addDumpField("strain");
// model.dump();
for
(
UInt
s
=
1
;
s
<=
max_steps
;
++
s
)
{
model
.
checkCohesiveStress
();
model
.
solveStep
();
UInt
nb_cohesive_elements
=
mesh
.
getNbElement
(
_cohesive_1d_2
);
if
(
s
%
10
==
0
)
{
std
::
cout
<<
"passing step "
<<
s
<<
"/"
<<
max_steps
<<
", number of cohesive elemets:"
<<
nb_cohesive_elements
<<
std
::
endl
;
// model.dump();
}
/// update external work and boundary conditions
for
(
UInt
n
=
0
;
n
<
mesh
.
getNbNodes
();
++
n
)
{
if
(
Math
::
are_float_equal
(
position
(
n
),
posx_min
))
// left side
displacement
(
n
)
-=
disp_increment
;
if
(
Math
::
are_float_equal
(
position
(
n
),
posx_max
))
// right side
displacement
(
n
)
+=
disp_increment
;
}
}
Real
Ed
=
model
.
getEnergy
(
"dissipated"
);
Real
Edt
=
100
*
3
;
std
::
cout
<<
Ed
<<
std
::
endl
;
if
(
Ed
<
Edt
*
0.999
||
Ed
>
Edt
*
1.001
||
std
::
isnan
(
Ed
))
{
std
::
cout
<<
"The dissipated energy is incorrect"
<<
std
::
endl
;
finalize
();
return
EXIT_FAILURE
;
}
finalize
();
return
EXIT_SUCCESS
;
}
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