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test_cohesive_buildfragments.cc
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rAKA akantu
test_cohesive_buildfragments.cc
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/**
* @file test_cohesive_buildfragments.cc
*
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Sun Oct 19 2014
* @date last modification: Thu May 09 2019
*
* @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 "fragment_manager.hh"
#include "material_cohesive.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
);
Math
::
setTolerance
(
1e-14
);
const
UInt
spatial_dimension
=
2
;
const
UInt
max_steps
=
200
;
Real
strain_rate
=
1.e5
;
ElementType
type
=
_quadrangle_4
;
Real
L
=
0.03
;
Real
theoretical_mass
=
L
*
L
/
20.
*
2500
;
ElementType
type_facet
=
Mesh
::
getFacetType
(
type
);
ElementType
type_cohesive
=
FEEngine
::
getCohesiveElementType
(
type_facet
);
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"mesh.msh"
);
SolidMechanicsModelCohesive
model
(
mesh
);
/// model initialization
model
.
initFull
(
_analysis_method
=
_explicit_lumped_mass
,
_is_extrinsic
=
true
);
Real
time_step
=
model
.
getStableTimeStep
()
*
0.05
;
model
.
setTimeStep
(
time_step
);
// std::cout << "Time step: " << time_step << std::endl;
Real
disp_increment
=
strain_rate
*
L
/
2.
*
time_step
;
model
.
assembleMassLumped
();
Array
<
Real
>
&
velocity
=
model
.
getVelocity
();
const
Array
<
Real
>
&
position
=
mesh
.
getNodes
();
UInt
nb_nodes
=
mesh
.
getNbNodes
();
/// initial conditions
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
velocity
(
n
,
0
)
=
strain_rate
*
position
(
n
,
0
);
/// boundary conditions
model
.
applyBC
(
BC
::
Dirichlet
::
FixedValue
(
0
,
_x
),
"Left_side"
);
model
.
applyBC
(
BC
::
Dirichlet
::
FixedValue
(
0
,
_x
),
"Right_side"
);
UInt
cohesive_index
=
1
;
UInt
nb_quad_per_facet
=
model
.
getFEEngine
(
"FacetsFEEngine"
).
getNbIntegrationPoints
(
type_facet
);
MaterialCohesive
&
mat_cohesive
=
dynamic_cast
<
MaterialCohesive
&>
(
model
.
getMaterial
(
cohesive_index
));
const
Array
<
Real
>
&
damage
=
mat_cohesive
.
getDamage
(
type_cohesive
);
FragmentManager
fragment_manager
(
model
,
false
);
const
Array
<
Real
>
&
fragment_mass
=
fragment_manager
.
getMass
();
/// Main loop
for
(
UInt
s
=
1
;
s
<=
max_steps
;
++
s
)
{
model
.
checkCohesiveStress
();
model
.
solveStep
();
/// apply boundary conditions
model
.
applyBC
(
BC
::
Dirichlet
::
IncrementValue
(
-
disp_increment
,
_x
),
"Left_side"
);
model
.
applyBC
(
BC
::
Dirichlet
::
IncrementValue
(
disp_increment
,
_x
),
"Right_side"
);
if
(
s
%
1
==
0
)
{
// model.dump();
std
::
cout
<<
"passing step "
<<
s
<<
"/"
<<
max_steps
<<
std
::
endl
;
fragment_manager
.
computeAllData
();
/// check number of fragments
UInt
nb_fragment_num
=
fragment_manager
.
getNbFragment
();
UInt
nb_cohesive_elements
=
mesh
.
getNbElement
(
type_cohesive
);
UInt
nb_fragment
=
1
;
for
(
UInt
el
=
0
;
el
<
nb_cohesive_elements
;
++
el
)
{
UInt
q
=
0
;
while
(
q
<
nb_quad_per_facet
&&
Math
::
are_float_equal
(
damage
(
el
*
nb_quad_per_facet
+
q
),
1
))
++
q
;
if
(
q
==
nb_quad_per_facet
)
{
++
nb_fragment
;
}
}
if
(
nb_fragment
!=
nb_fragment_num
)
{
std
::
cout
<<
"The number of fragments is wrong!"
<<
std
::
endl
;
return
EXIT_FAILURE
;
}
/// check mass computation
Real
total_mass
=
0.
;
for
(
UInt
frag
=
0
;
frag
<
nb_fragment_num
;
++
frag
)
{
total_mass
+=
fragment_mass
(
frag
);
}
if
(
!
Math
::
are_float_equal
(
theoretical_mass
,
total_mass
))
{
std
::
cout
<<
"The fragments' mass is wrong!"
<<
std
::
endl
;
return
EXIT_FAILURE
;
}
}
}
model
.
dump
();
/// check velocities
UInt
nb_fragment
=
fragment_manager
.
getNbFragment
();
const
Array
<
Real
>
&
fragment_velocity
=
fragment_manager
.
getVelocity
();
const
Array
<
Real
>
&
fragment_center
=
fragment_manager
.
getCenterOfMass
();
Real
fragment_length
=
L
/
nb_fragment
;
Real
initial_position
=
-
L
/
2.
+
fragment_length
/
2.
;
for
(
UInt
frag
=
0
;
frag
<
nb_fragment
;
++
frag
)
{
Real
theoretical_center
=
initial_position
+
fragment_length
*
frag
;
if
(
!
Math
::
are_float_equal
(
fragment_center
(
frag
,
0
),
theoretical_center
))
{
std
::
cout
<<
"The fragments' center is wrong!"
<<
std
::
endl
;
return
EXIT_FAILURE
;
}
Real
initial_vel
=
fragment_center
(
frag
,
0
)
*
strain_rate
;
Math
::
setTolerance
(
100
);
if
(
!
Math
::
are_float_equal
(
fragment_velocity
(
frag
),
initial_vel
))
{
std
::
cout
<<
"The fragments' velocity is wrong!"
<<
std
::
endl
;
return
EXIT_FAILURE
;
}
}
finalize
();
std
::
cout
<<
"OK: test_cohesive_buildfragments was passed!"
<<
std
::
endl
;
return
EXIT_SUCCESS
;
}
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