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test_cohesive_intrinsic_impl.cc
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rAKA akantu
test_cohesive_intrinsic_impl.cc
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/**
* @file test_cohesive_intrinsic_impl.cc
*
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Sun Oct 19 2014
* @date last modification: Sun Dec 30 2018
*
* @brief Test for cohesive elements
*
*
* @section LICENSE
*
* Copyright (©) 2010-2021 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 "non_linear_solver.hh"
#include "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
#include <fstream>
#include <iostream>
#include <limits>
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
int
main
(
int
argc
,
char
*
argv
[])
{
initialize
(
"material.dat"
,
argc
,
argv
);
debug
::
setDebugLevel
(
dblError
);
const
UInt
spatial_dimension
=
2
;
const
ElementType
type
=
_triangle_6
;
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"implicit.msh"
);
CohesiveElementInserter
inserter
(
mesh
);
inserter
.
setLimit
(
_y
,
0.9
,
1.1
);
inserter
.
insertIntrinsicElements
();
// mesh.write("implicit_cohesive.msh");
SolidMechanicsModelCohesive
model
(
mesh
);
/// model initialization
model
.
initFull
(
SolidMechanicsModelCohesiveOptions
(
_static
));
/// boundary conditions
Array
<
bool
>
&
boundary
=
model
.
getBlockedDOFs
();
UInt
nb_nodes
=
mesh
.
getNbNodes
();
Array
<
Real
>
&
position
=
mesh
.
getNodes
();
Array
<
Real
>
&
displacement
=
model
.
getDisplacement
();
const
ElementType
type_facet
=
mesh
.
getFacetType
(
type
);
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
if
(
std
::
abs
(
position
(
n
,
1
))
<
Math
::
getTolerance
())
{
boundary
(
n
,
1
)
=
true
;
displacement
(
n
,
1
)
=
0.0
;
}
if
((
std
::
abs
(
position
(
n
,
0
))
<
Math
::
getTolerance
())
&&
(
position
(
n
,
1
)
<
1.1
))
{
boundary
(
n
,
0
)
=
true
;
displacement
(
n
,
0
)
=
0.0
;
}
if
((
std
::
abs
(
position
(
n
,
0
)
-
1
)
<
Math
::
getTolerance
())
&&
(
std
::
abs
(
position
(
n
,
1
)
-
1
)
<
Math
::
getTolerance
()))
{
boundary
(
n
,
0
)
=
true
;
displacement
(
n
,
0
)
=
0.0
;
}
if
(
std
::
abs
(
position
(
n
,
1
)
-
2
)
<
Math
::
getTolerance
())
{
boundary
(
n
,
1
)
=
true
;
}
}
model
.
setBaseName
(
"intrinsic_impl"
);
model
.
addDumpField
(
"displacement"
);
// model.addDumpField("mass" );
model
.
addDumpField
(
"velocity"
);
model
.
addDumpField
(
"acceleration"
);
model
.
addDumpField
(
"force"
);
model
.
addDumpField
(
"residual"
);
// model.addDumpField("damage" );
model
.
addDumpField
(
"stress"
);
model
.
addDumpField
(
"strain"
);
model
.
dump
();
const
MaterialCohesive
&
mat_coh
=
dynamic_cast
<
const
MaterialCohesive
&>
(
model
.
getMaterial
(
1
));
ElementType
type_cohesive
=
FEEngine
::
getCohesiveElementType
(
type_facet
);
const
Array
<
Real
>
&
opening
=
mat_coh
.
getOpening
(
type_cohesive
);
// const Array<Real> & traction = mat_coh.getTraction(type_cohesive);
model
.
assembleInternalForces
();
const
Array
<
Real
>
&
residual
=
model
.
getInternalForce
();
UInt
max_step
=
1000
;
Real
increment
=
3.
/
max_step
;
Real
error_tol
=
10e-6
;
std
::
ofstream
fout
;
fout
.
open
(
"output"
);
auto
&
solver
=
model
.
getNonLinearSolver
();
solver
.
set
(
"max_iterations"
,
100
);
solver
.
set
(
"threshold"
,
1e-5
);
solver
.
set
(
"convergence_type"
,
SolveConvergenceCriteria
::
_residual
);
/// Main loop
for
(
UInt
nstep
=
0
;
nstep
<
max_step
;
++
nstep
)
{
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
if
(
std
::
abs
(
position
(
n
,
1
)
-
2
)
<
Math
::
getTolerance
())
{
displacement
(
n
,
1
)
+=
increment
;
}
}
model
.
solveStep
();
// model.dump();
Real
resid
=
0
;
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
if
(
std
::
abs
(
position
(
n
,
1
)
-
2.
)
/
2.
<
Math
::
getTolerance
())
{
resid
+=
residual
(
n
,
1
);
}
}
Real
analytical
=
exp
(
1
)
*
std
::
abs
(
opening
(
0
,
1
))
*
exp
(
-
std
::
abs
(
opening
(
0
,
1
))
/
0.5
)
/
0.5
;
// the residual force is comparing with the theoretical value of the
// cohesive law
error_tol
=
std
::
abs
((
std
::
abs
(
resid
)
-
analytical
)
/
analytical
);
fout
<<
nstep
<<
" "
<<
-
resid
<<
" "
<<
analytical
<<
" "
<<
error_tol
<<
std
::
endl
;
if
(
error_tol
>
1e-3
)
{
std
::
cout
<<
"Relative error: "
<<
error_tol
<<
std
::
endl
;
std
::
cout
<<
"Test failed!"
<<
std
::
endl
;
return
EXIT_FAILURE
;
}
}
model
.
dump
();
fout
.
close
();
finalize
();
std
::
cout
<<
"Test passed!"
<<
std
::
endl
;
return
EXIT_SUCCESS
;
}
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