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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: Sun Oct 19 2014
* @date last modification: Wed Jan 10 2018
*
* @brief Test for 1D cohesive elements
*
*
* @section LICENSE
*
* Copyright (©) 2014-2021 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 "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
=
5
;
Int
spatial_dimension
=
1
;
Mesh
mesh
(
spatial_dimension
,
"mesh"
);
mesh
.
read
(
"bar.msh"
);
Math
::
setTolerance
(
1e-7
);
SolidMechanicsModelCohesive
model
(
mesh
);
model
.
initFull
(
_analysis_method
=
_explicit_lumped_mass
,
_is_extrinsic
=
true
);
auto
time_step
=
model
.
getStableTimeStep
()
*
0.01
;
model
.
setTimeStep
(
time_step
);
std
::
cout
<<
"Time step: "
<<
time_step
<<
std
::
endl
;
auto
posx_max
=
mesh
.
getUpperBounds
()(
_x
);
auto
posx_min
=
mesh
.
getLowerBounds
()(
_x
);
/// initial conditions
const
auto
&
position
=
mesh
.
getNodes
();
auto
&
velocity
=
model
.
getVelocity
();
auto
nb_nodes
=
mesh
.
getNbNodes
();
for
(
Int
n
=
0
;
n
<
nb_nodes
;
++
n
)
velocity
(
n
)
=
strain_rate
*
(
position
(
n
)
-
(
posx_max
+
posx_min
)
/
2.
);
/// boundary conditions
model
.
applyBC
(
BC
::
Dirichlet
::
FlagOnly
(
_x
),
"left"
);
model
.
applyBC
(
BC
::
Dirichlet
::
FlagOnly
(
_x
),
"right"
);
auto
disp_increment
=
strain_rate
*
(
posx_max
-
posx_min
)
/
2.
*
time_step
;
model
.
assembleInternalForces
();
for
(
Int
s
=
1
;
s
<=
max_steps
;
++
s
)
{
model
.
checkCohesiveStress
();
model
.
solveStep
();
auto
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
;
}
/// update external work and boundary conditions
model
.
applyBC
(
BC
::
Dirichlet
::
IncrementValue
(
-
disp_increment
,
_x
),
"left"
);
model
.
applyBC
(
BC
::
Dirichlet
::
IncrementValue
(
disp_increment
,
_x
),
"right"
);
}
auto
Ed
=
model
.
getEnergy
(
"dissipated"
);
auto
Edt
=
100.
*
3.
;
std
::
cout
<<
Ed
<<
" "
<<
Edt
<<
std
::
endl
;
if
(
std
::
abs
(
Ed
-
Edt
)
>
0.001
||
std
::
isnan
(
Ed
))
{
std
::
cout
<<
"The dissipated energy is incorrect"
<<
std
::
endl
;
finalize
();
return
EXIT_FAILURE
;
}
finalize
();
return
EXIT_SUCCESS
;
}
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