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cohesive_extrinsic_implicit.cc
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rAKA akantu
cohesive_extrinsic_implicit.cc
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/**
* @file cohesive_extrinsic_implicit.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Tue Jan 12 2016
* @date last modification: Mon Jan 18 2016
*
* @brief Example for extrinsic cohesive elements in implicit
*
* @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 "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
#include <iostream>
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
int
main
(
int
argc
,
char
*
argv
[])
{
initialize
(
"material.dat"
,
argc
,
argv
);
debug
::
setDebugLevel
(
dblError
);
const
UInt
spatial_dimension
=
2
;
const
UInt
max_steps
=
20
;
const
Real
final_opening
=
1e-4
;
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"dcb_2d.msh"
);
SolidMechanicsModelCohesive
model
(
mesh
);
/// model initialization
model
.
initFull
(
SolidMechanicsModelCohesiveOptions
(
_static
,
true
));
// CohesiveElementInserter inserter(mesh);
model
.
limitInsertion
(
_y
,
-
0.000001
,
0.000001
);
model
.
updateAutomaticInsertion
();
Real
eps
=
1e-11
;
Array
<
bool
>
&
boundary
=
model
.
getBlockedDOFs
();
Array
<
Real
>
&
position
=
mesh
.
getNodes
();
Array
<
Real
>
&
displacement
=
model
.
getDisplacement
();
/// boundary conditions
const
Vector
<
Real
>
&
lower
=
mesh
.
getLowerBounds
();
const
Vector
<
Real
>
&
upper
=
mesh
.
getUpperBounds
();
const
Real
left
=
lower
[
0
];
const
Real
right
=
upper
[
0
];
for
(
UInt
n
=
0
;
n
<
mesh
.
getNbNodes
();
++
n
)
{
if
(
std
::
abs
(
position
(
n
,
0
)
-
left
)
<
eps
)
{
boundary
(
n
,
1
)
=
true
;
boundary
(
n
,
0
)
=
true
;
}
if
(
std
::
abs
(
position
(
n
,
0
)
-
right
)
<
eps
&&
position
(
n
,
1
)
<
0.0
)
boundary
(
n
,
1
)
=
true
;
if
(
std
::
abs
(
position
(
n
,
0
)
-
right
)
<
eps
&&
position
(
n
,
1
)
>
0.0
)
boundary
(
n
,
1
)
=
true
;
}
model
.
setBaseName
(
"extr_impl"
);
model
.
addDumpFieldVector
(
"displacement"
);
model
.
addDumpField
(
"external_force"
);
model
.
addDumpField
(
"internal_force"
);
model
.
addDumpField
(
"stress"
);
model
.
addDumpField
(
"partitions"
);
model
.
dump
();
// Dumping cohesive elements
model
.
setBaseNameToDumper
(
"cohesive elements"
,
"cohe_elem_extr_impl"
);
model
.
addDumpFieldVectorToDumper
(
"cohesive elements"
,
"displacement"
);
model
.
addDumpFieldToDumper
(
"cohesive elements"
,
"damage"
);
model
.
dump
(
"cohesive elements"
);
// model.updateResidual();
Real
increment
=
final_opening
/
max_steps
;
Real
tolerance
=
1e-13
;
Real
error
;
bool
load_reduction
=
false
;
Real
tol_increase_factor
=
1.0e8
;
/// Main loop
for
(
UInt
nstep
=
0
;
nstep
<
max_steps
;
++
nstep
)
{
std
::
cout
<<
"step no. "
<<
nstep
<<
std
::
endl
;
for
(
UInt
n
=
0
;
n
<
mesh
.
getNbNodes
();
++
n
)
{
if
(
std
::
abs
(
position
(
n
,
0
)
-
right
)
<
eps
&&
position
(
n
,
1
)
>
0.0
)
displacement
(
n
,
1
)
+=
increment
;
if
(
std
::
abs
(
position
(
n
,
0
)
-
right
)
<
eps
&&
position
(
n
,
1
)
<
0.0
)
displacement
(
n
,
1
)
-=
increment
;
}
model
.
solveStepCohesive
<
_scm_newton_raphson_tangent
,
SolveConvergenceCriteria
::
_increment
>
(
tolerance
,
error
,
25
,
load_reduction
,
tol_increase_factor
);
// If convergence has not been reached, the load is reduced and
// the incremental step is solved again.
while
(
!
load_reduction
&&
error
>
tolerance
)
{
load_reduction
=
true
;
std
::
cout
<<
"LOAD STEP REDUCTION"
<<
std
::
endl
;
increment
=
increment
/
2.0
;
for
(
UInt
n
=
0
;
n
<
mesh
.
getNbNodes
();
++
n
)
{
if
(
std
::
abs
(
position
(
n
,
0
)
-
right
)
<
eps
&&
position
(
n
,
1
)
>
0.0
)
displacement
(
n
,
1
)
-=
increment
;
if
(
std
::
abs
(
position
(
n
,
0
)
-
right
)
<
eps
&&
position
(
n
,
1
)
<
0.0
)
displacement
(
n
,
1
)
+=
increment
;
}
UInt
nb_cohesive_elements
=
mesh
.
getNbElement
(
spatial_dimension
,
_not_ghost
,
_ek_cohesive
);
model
.
solveStepCohesive
<
_scm_newton_raphson_tangent
,
SolveConvergenceCriteria
::
_increment
>
(
tolerance
,
error
,
25
,
load_reduction
,
tol_increase_factor
);
UInt
new_nb_cohesive_elements
=
mesh
.
getNbElement
(
spatial_dimension
,
_not_ghost
,
_ek_cohesive
);
UInt
nb_cohe
[
2
];
nb_cohe
[
0
]
=
nb_cohesive_elements
;
nb_cohe
[
1
]
=
new_nb_cohesive_elements
;
// Every time a new cohesive element is introduced, the variable
// load_reduction is set to false, so that it is possible to
// further iterate in the loop of load reduction. If no new
// cohesive elements are introduced, usually there is no gain in
// further reducing the load, even if convergence is not reached
if
(
nb_cohe
[
0
]
==
nb_cohe
[
1
])
load_reduction
=
true
;
else
load_reduction
=
false
;
}
model
.
dump
();
model
.
dump
(
"cohesive elements"
);
UInt
nb_cohe_elems
[
1
];
nb_cohe_elems
[
0
]
=
mesh
.
getNbElement
(
spatial_dimension
,
_not_ghost
,
_ek_cohesive
);
std
::
cout
<<
"No. of cohesive elements: "
<<
nb_cohe_elems
[
0
]
<<
std
::
endl
;
}
finalize
();
return
EXIT_SUCCESS
;
}
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