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cohesive_extrinsic_ig_tg.cc
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rAKA akantu
cohesive_extrinsic_ig_tg.cc
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/**
* @file cohesive_extrinsic_ig_tg.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 considering different cohesive properties for intergranular
* (IG) and
* transgranular (TG) fractures in extrinsic 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 "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
#include <iostream>
/* -------------------------------------------------------------------------- */
using
namespace
akantu
;
class
MultiGrainMaterialSelector
:
public
DefaultMaterialCohesiveSelector
{
public
:
MultiGrainMaterialSelector
(
const
SolidMechanicsModelCohesive
&
model
,
const
ID
&
transgranular_id
,
const
ID
&
intergranular_id
)
:
DefaultMaterialCohesiveSelector
(
model
),
transgranular_id
(
transgranular_id
),
intergranular_id
(
intergranular_id
),
model
(
model
),
mesh
(
model
.
getMesh
()),
mesh_facets
(
model
.
getMeshFacets
()),
spatial_dimension
(
model
.
getSpatialDimension
()),
nb_IG
(
0
),
nb_TG
(
0
)
{}
UInt
operator
()(
const
Element
&
element
)
{
if
(
mesh_facets
.
getSpatialDimension
(
element
.
type
)
==
(
spatial_dimension
-
1
))
{
const
std
::
vector
<
Element
>
&
element_to_subelement
=
mesh_facets
.
getElementToSubelement
(
element
.
type
,
element
.
ghost_type
)(
element
.
element
);
const
Element
&
el1
=
element_to_subelement
[
0
];
const
Element
&
el2
=
element_to_subelement
[
1
];
UInt
grain_id1
=
mesh
.
getData
<
UInt
>
(
"tag_0"
,
el1
.
type
,
el1
.
ghost_type
)(
el1
.
element
);
if
(
el2
!=
ElementNull
)
{
UInt
grain_id2
=
mesh
.
getData
<
UInt
>
(
"tag_0"
,
el2
.
type
,
el2
.
ghost_type
)(
el2
.
element
);
if
(
grain_id1
==
grain_id2
)
{
// transgranular = 0 indicator
nb_TG
++
;
return
model
.
getMaterialIndex
(
transgranular_id
);
}
else
{
// intergranular = 1 indicator
nb_IG
++
;
return
model
.
getMaterialIndex
(
intergranular_id
);
}
}
else
{
// transgranular = 0 indicator
nb_TG
++
;
return
model
.
getMaterialIndex
(
transgranular_id
);
}
}
else
{
return
DefaultMaterialCohesiveSelector
::
operator
()(
element
);
}
}
private
:
ID
transgranular_id
,
intergranular_id
;
const
SolidMechanicsModelCohesive
&
model
;
const
Mesh
&
mesh
;
const
Mesh
&
mesh_facets
;
UInt
spatial_dimension
;
UInt
nb_IG
;
UInt
nb_TG
;
};
/* -------------------------------------------------------------------------- */
int
main
(
int
argc
,
char
*
argv
[])
{
initialize
(
"material.dat"
,
argc
,
argv
);
const
UInt
spatial_dimension
=
2
;
const
UInt
max_steps
=
1000
;
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"square.msh"
);
SolidMechanicsModelCohesive
model
(
mesh
);
/// model initialization
auto
material_selector
=
std
::
make_shared
<
MultiGrainMaterialSelector
>
(
model
,
"tg_cohesive"
,
"ig_cohesive"
);
model
.
setMaterialSelector
(
material_selector
);
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
;
model
.
assembleMassLumped
();
Array
<
Real
>
&
position
=
mesh
.
getNodes
();
Array
<
Real
>
&
velocity
=
model
.
getVelocity
();
Array
<
bool
>
&
boundary
=
model
.
getBlockedDOFs
();
Array
<
Real
>
&
displacement
=
model
.
getDisplacement
();
UInt
nb_nodes
=
mesh
.
getNbNodes
();
/// boundary conditions
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
if
(
position
(
n
,
1
)
>
0.99
||
position
(
n
,
1
)
<
-
0.99
)
boundary
(
n
,
1
)
=
true
;
if
(
position
(
n
,
0
)
>
0.99
||
position
(
n
,
0
)
<
-
0.99
)
boundary
(
n
,
0
)
=
true
;
}
model
.
setBaseName
(
"extrinsic"
);
model
.
addDumpFieldVector
(
"displacement"
);
model
.
addDumpField
(
"velocity"
);
model
.
addDumpField
(
"acceleration"
);
model
.
addDumpField
(
"internal_force"
);
model
.
addDumpField
(
"stress"
);
model
.
addDumpField
(
"grad_u"
);
model
.
dump
();
/// initial conditions
Real
loading_rate
=
0.1
;
// bar_height = 2
Real
VI
=
loading_rate
*
2
*
0.5
;
for
(
UInt
n
=
0
;
n
<
nb_nodes
;
++
n
)
{
velocity
(
n
,
1
)
=
loading_rate
*
position
(
n
,
1
);
velocity
(
n
,
0
)
=
loading_rate
*
position
(
n
,
0
);
}
model
.
dump
();
Real
dispy
=
0
;
/// Main loop
for
(
UInt
s
=
1
;
s
<=
max_steps
;
++
s
)
{
dispy
+=
VI
*
time_step
;
/// update displacement on extreme nodes
for
(
UInt
n
=
0
;
n
<
mesh
.
getNbNodes
();
++
n
)
{
if
(
position
(
n
,
1
)
>
0.99
)
{
displacement
(
n
,
1
)
=
dispy
;
velocity
(
n
,
1
)
=
VI
;
}
if
(
position
(
n
,
1
)
<
-
0.99
)
{
displacement
(
n
,
1
)
=
-
dispy
;
velocity
(
n
,
1
)
=
-
VI
;
}
if
(
position
(
n
,
0
)
>
0.99
)
{
displacement
(
n
,
0
)
=
dispy
;
velocity
(
n
,
0
)
=
VI
;
}
if
(
position
(
n
,
0
)
<
-
0.99
)
{
displacement
(
n
,
0
)
=
-
dispy
;
velocity
(
n
,
0
)
=
-
VI
;
}
}
model
.
checkCohesiveStress
();
model
.
solveStep
();
if
(
s
%
10
==
0
)
{
model
.
dump
();
std
::
cout
<<
"passing step "
<<
s
<<
"/"
<<
max_steps
<<
std
::
endl
;
}
}
finalize
();
return
EXIT_SUCCESS
;
}
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