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cohesive_intrinsic.cc
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rAKA akantu
cohesive_intrinsic.cc
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/**
* @file cohesive_intrinsic.cc
*
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Mon Jan 18 2016
*
* @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 "mesh_iterators.hh"
#include "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
#include <iostream>
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
static
void
updateDisplacement
(
SolidMechanicsModelCohesive
&
,
Array
<
UInt
>
&
,
ElementType
,
Real
);
/* -------------------------------------------------------------------------- */
int
main
(
int
argc
,
char
*
argv
[])
{
initialize
(
"material.dat"
,
argc
,
argv
);
const
UInt
spatial_dimension
=
2
;
const
UInt
max_steps
=
350
;
const
ElementType
type
=
_triangle_6
;
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"triangle.msh"
);
CohesiveElementInserter
inserter
(
mesh
);
inserter
.
setLimit
(
_x
,
-
0.26
,
-
0.24
);
inserter
.
insertIntrinsicElements
();
SolidMechanicsModelCohesive
model
(
mesh
);
/// model initialization
model
.
initFull
();
Real
time_step
=
model
.
getStableTimeStep
()
*
0.8
;
model
.
setTimeStep
(
time_step
);
std
::
cout
<<
"Time step: "
<<
time_step
<<
std
::
endl
;
Array
<
bool
>
&
boundary
=
model
.
getBlockedDOFs
();
UInt
nb_nodes
=
mesh
.
getNbNodes
();
/// boundary conditions
for
(
UInt
dim
=
0
;
dim
<
spatial_dimension
;
++
dim
)
{
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
boundary
(
n
,
dim
)
=
true
;
}
}
model
.
setBaseName
(
"intrinsic"
);
model
.
addDumpFieldVector
(
"displacement"
);
model
.
addDumpField
(
"velocity"
);
model
.
addDumpField
(
"acceleration"
);
model
.
addDumpField
(
"stress"
);
model
.
addDumpField
(
"grad_u"
);
model
.
addDumpField
(
"external_force"
);
model
.
addDumpField
(
"internal_force"
);
model
.
dump
();
/// update displacement
Array
<
UInt
>
elements
;
Vector
<
Real
>
barycenter
(
spatial_dimension
);
for_each_element
(
mesh
,
[
&
](
auto
&&
el
)
{
mesh
.
getBarycenter
(
el
,
barycenter
);
if
(
barycenter
(
_x
)
>
-
0.25
)
elements
.
push_back
(
el
.
element
);
});
Real
increment
=
0.01
;
updateDisplacement
(
model
,
elements
,
type
,
increment
);
/// Main loop
for
(
UInt
s
=
1
;
s
<=
max_steps
;
++
s
)
{
model
.
solveStep
();
updateDisplacement
(
model
,
elements
,
type
,
increment
);
if
(
s
%
1
==
0
)
{
model
.
dump
();
std
::
cout
<<
"passing step "
<<
s
<<
"/"
<<
max_steps
<<
std
::
endl
;
}
}
Real
Ed
=
model
.
getEnergy
(
"dissipated"
);
Real
Edt
=
2
*
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
();
return
EXIT_SUCCESS
;
}
/* -------------------------------------------------------------------------- */
static
void
updateDisplacement
(
SolidMechanicsModelCohesive
&
model
,
Array
<
UInt
>
&
elements
,
ElementType
type
,
Real
increment
)
{
Mesh
&
mesh
=
model
.
getMesh
();
UInt
nb_element
=
elements
.
size
();
UInt
nb_nodes
=
mesh
.
getNbNodes
();
UInt
nb_nodes_per_element
=
mesh
.
getNbNodesPerElement
(
type
);
const
Array
<
UInt
>
&
connectivity
=
mesh
.
getConnectivity
(
type
);
Array
<
Real
>
&
displacement
=
model
.
getDisplacement
();
Array
<
bool
>
update
(
nb_nodes
);
update
.
clear
();
for
(
UInt
el
=
0
;
el
<
nb_element
;
++
el
)
{
for
(
UInt
n
=
0
;
n
<
nb_nodes_per_element
;
++
n
)
{
UInt
node
=
connectivity
(
elements
(
el
),
n
);
if
(
!
update
(
node
))
{
displacement
(
node
,
0
)
-=
increment
;
// displacement(node, 1) += increment;
update
(
node
)
=
true
;
}
}
}
}
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