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contact_explicit_dynamic.cc
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rAKA akantu
contact_explicit_dynamic.cc
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/**
* @file test_contact_mechanics_model.cc
*
* @author Mohit Pundir <mohit.pundir@epfl.ch>
*
* @date creation: Tue Apr 30 2019
* @date last modification: Tue Apr 30 2019
*
* @brief Test for contact mechanics model class
*
* @section LICENSE
*
* Copyright (©) 2010-2018 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.hh"
#include "contact_mechanics_model.hh"
#include "coupler_solid_contact.hh"
#include "non_linear_solver.hh"
#include "surface_selector.hh"
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
/* -------------------------------------------------------------------------- */
int
main
(
int
argc
,
char
*
argv
[])
{
const
UInt
spatial_dimension
=
2
;
initialize
(
"material.dat"
,
argc
,
argv
);
Real
time_step
;
Real
time_factor
=
0.1
;
UInt
max_steps
=
20000
;
Real
max_displacement
=
5e-3
;
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"hertz.msh"
);
CouplerSolidContact
coupler
(
mesh
);
auto
&
solid
=
coupler
.
getSolidMechanicsModel
();
auto
&
contact
=
coupler
.
getContactMechanicsModel
();
auto
&&
selector
=
std
::
make_shared
<
MeshDataMaterialSelector
<
std
::
string
>>
(
"physical_names"
,
solid
);
solid
.
setMaterialSelector
(
selector
);
coupler
.
initFull
(
_analysis_method
=
_explicit_lumped_mass
);
auto
&&
surface_selector
=
std
::
make_shared
<
PhysicalSurfaceSelector
>
(
mesh
);
contact
.
getContactDetector
().
setSurfaceSelector
(
surface_selector
);
solid
.
applyBC
(
BC
::
Dirichlet
::
FixedValue
(
0.0
,
_x
),
"fixed"
);
solid
.
applyBC
(
BC
::
Dirichlet
::
FixedValue
(
0.0
,
_y
),
"fixed"
);
solid
.
applyBC
(
BC
::
Dirichlet
::
FixedValue
(
0.0
,
_x
),
"loading"
);
solid
.
applyBC
(
BC
::
Dirichlet
::
FixedValue
(
0.0
,
_x
),
"symmetry"
);
time_step
=
solid
.
getStableTimeStep
();
time_step
*=
time_factor
;
std
::
cout
<<
"Time Step = "
<<
time_step
<<
"s ("
<<
time_step
<<
"s)"
<<
std
::
endl
;
coupler
.
setTimeStep
(
time_step
);
coupler
.
setBaseName
(
"contact-explicit-dynamic"
);
coupler
.
addDumpFieldVector
(
"displacement"
);
coupler
.
addDumpFieldVector
(
"velocity"
);
coupler
.
addDumpFieldVector
(
"normals"
);
coupler
.
addDumpFieldVector
(
"contact_force"
);
coupler
.
addDumpFieldVector
(
"external_force"
);
coupler
.
addDumpFieldVector
(
"internal_force"
);
coupler
.
addDumpField
(
"gaps"
);
coupler
.
addDumpField
(
"areas"
);
coupler
.
addDumpField
(
"blocked_dofs"
);
coupler
.
addDumpField
(
"grad_u"
);
coupler
.
addDumpField
(
"stress"
);
auto
&
velocity
=
solid
.
getVelocity
();
auto
&
gaps
=
contact
.
getGaps
();
Real
damping_ratio
=
0.99
;
auto
increment
=
max_displacement
/
max_steps
;
for
(
auto
i
:
arange
(
max_steps
))
{
solid
.
applyBC
(
BC
::
Dirichlet
::
IncrementValue
(
-
increment
,
_y
),
"loading"
);
coupler
.
solveStep
();
// damping velocities only along the contacting zone
for
(
auto
&&
tuple
:
zip
(
gaps
,
make_view
(
velocity
,
spatial_dimension
))){
auto
&
gap
=
std
::
get
<
0
>
(
tuple
);
auto
&
vel
=
std
::
get
<
1
>
(
tuple
);
if
(
gap
>
0
)
{
vel
*=
damping_ratio
;
}
}
// dumping energies
if
(
i
%
1000
==
0
)
{
Real
epot
=
solid
.
getEnergy
(
"potential"
);
Real
ekin
=
solid
.
getEnergy
(
"kinetic"
);
std
::
cerr
<<
i
<<
","
<<
i
*
increment
<<
","
<<
epot
<<
","
<<
ekin
<<
","
<<
epot
+
ekin
<<
","
<<
std
::
endl
;
}
if
(
i
%
1000
==
0
)
{
coupler
.
dump
();
}
}
finalize
();
return
EXIT_SUCCESS
;
}
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