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material_elastic_orthotropic.cc
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rAKA akantu
material_elastic_orthotropic.cc
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/**
* @file material_elastic_orthotropic.cc
*
* @author Till Junge <till.junge@epfl.ch>
* @author Enrico Milanese <enrico.milanese@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Fri Jun 18 2010
* @date last modification: Tue Feb 20 2018
*
* @brief Orthotropic elastic material
*
* @section LICENSE
*
* Copyright (©) 2010-2018 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 "material_elastic_orthotropic.hh"
#include "solid_mechanics_model.hh"
#include <algorithm>
namespace
akantu
{
/* -------------------------------------------------------------------------- */
template
<
UInt
Dim
>
MaterialElasticOrthotropic
<
Dim
>::
MaterialElasticOrthotropic
(
SolidMechanicsModel
&
model
,
const
ID
&
id
)
:
MaterialElasticLinearAnisotropic
<
Dim
>
(
model
,
id
)
{
AKANTU_DEBUG_IN
();
this
->
registerParam
(
"E1"
,
E1
,
Real
(
0.
),
_pat_parsmod
,
"Young's modulus (n1)"
);
this
->
registerParam
(
"E2"
,
E2
,
Real
(
0.
),
_pat_parsmod
,
"Young's modulus (n2)"
);
this
->
registerParam
(
"nu12"
,
nu12
,
Real
(
0.
),
_pat_parsmod
,
"Poisson's ratio (12)"
);
this
->
registerParam
(
"G12"
,
G12
,
Real
(
0.
),
_pat_parsmod
,
"Shear modulus (12)"
);
if
(
Dim
>
2
)
{
this
->
registerParam
(
"E3"
,
E3
,
Real
(
0.
),
_pat_parsmod
,
"Young's modulus (n3)"
);
this
->
registerParam
(
"nu13"
,
nu13
,
Real
(
0.
),
_pat_parsmod
,
"Poisson's ratio (13)"
);
this
->
registerParam
(
"nu23"
,
nu23
,
Real
(
0.
),
_pat_parsmod
,
"Poisson's ratio (23)"
);
this
->
registerParam
(
"G13"
,
G13
,
Real
(
0.
),
_pat_parsmod
,
"Shear modulus (13)"
);
this
->
registerParam
(
"G23"
,
G23
,
Real
(
0.
),
_pat_parsmod
,
"Shear modulus (23)"
);
}
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
template
<
UInt
Dim
>
void
MaterialElasticOrthotropic
<
Dim
>::
initMaterial
()
{
AKANTU_DEBUG_IN
();
Material
::
initMaterial
();
updateInternalParameters
();
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
template
<
UInt
Dim
>
void
MaterialElasticOrthotropic
<
Dim
>::
updateInternalParameters
()
{
/* 1) construction of temporary material frame stiffness tensor------------ */
// http://solidmechanics.org/Text/Chapter3_2/Chapter3_2.php#Sect3_2_13
Real
nu21
=
nu12
*
E2
/
E1
;
Real
nu31
=
nu13
*
E3
/
E1
;
Real
nu32
=
nu23
*
E3
/
E2
;
// Full (i.e. dim^2 by dim^2) stiffness tensor in material frame
if
(
Dim
==
1
)
{
AKANTU_ERROR
(
"Dimensions 1 not implemented: makes no sense to have "
"orthotropy for 1D"
);
}
Real
Gamma
;
if
(
Dim
==
3
)
Gamma
=
1
/
(
1
-
nu12
*
nu21
-
nu23
*
nu32
-
nu31
*
nu13
-
2
*
nu21
*
nu32
*
nu13
);
if
(
Dim
==
2
)
Gamma
=
1
/
(
1
-
nu12
*
nu21
);
// Lamé's first parameters
this
->
Cprime
(
0
,
0
)
=
E1
*
(
1
-
nu23
*
nu32
)
*
Gamma
;
this
->
Cprime
(
1
,
1
)
=
E2
*
(
1
-
nu13
*
nu31
)
*
Gamma
;
if
(
Dim
==
3
)
this
->
Cprime
(
2
,
2
)
=
E3
*
(
1
-
nu12
*
nu21
)
*
Gamma
;
// normalised poisson's ratio's
this
->
Cprime
(
1
,
0
)
=
this
->
Cprime
(
0
,
1
)
=
E1
*
(
nu21
+
nu31
*
nu23
)
*
Gamma
;
if
(
Dim
==
3
)
{
this
->
Cprime
(
2
,
0
)
=
this
->
Cprime
(
0
,
2
)
=
E1
*
(
nu31
+
nu21
*
nu32
)
*
Gamma
;
this
->
Cprime
(
2
,
1
)
=
this
->
Cprime
(
1
,
2
)
=
E2
*
(
nu32
+
nu12
*
nu31
)
*
Gamma
;
}
// Lamé's second parameters (shear moduli)
if
(
Dim
==
3
)
{
this
->
Cprime
(
3
,
3
)
=
G23
;
this
->
Cprime
(
4
,
4
)
=
G13
;
this
->
Cprime
(
5
,
5
)
=
G12
;
}
else
this
->
Cprime
(
2
,
2
)
=
G12
;
/* 1) rotation of C into the global frame */
this
->
rotateCprime
();
this
->
C
.
eig
(
this
->
eigC
);
}
/* -------------------------------------------------------------------------- */
template
<
UInt
spatial_dimension
>
void
MaterialElasticOrthotropic
<
spatial_dimension
>::
computePotentialEnergyByElement
(
ElementType
type
,
UInt
index
,
Vector
<
Real
>
&
epot_on_quad_points
)
{
AKANTU_DEBUG_ASSERT
(
!
this
->
finite_deformation
,
"finite deformation not possible in material orthotropic "
"(TO BE IMPLEMENTED)"
);
Array
<
Real
>::
matrix_iterator
gradu_it
=
this
->
gradu
(
type
).
begin
(
spatial_dimension
,
spatial_dimension
);
Array
<
Real
>::
matrix_iterator
gradu_end
=
this
->
gradu
(
type
).
begin
(
spatial_dimension
,
spatial_dimension
);
Array
<
Real
>::
matrix_iterator
stress_it
=
this
->
stress
(
type
).
begin
(
spatial_dimension
,
spatial_dimension
);
UInt
nb_quadrature_points
=
this
->
fem
.
getNbIntegrationPoints
(
type
);
gradu_it
+=
index
*
nb_quadrature_points
;
gradu_end
+=
(
index
+
1
)
*
nb_quadrature_points
;
stress_it
+=
index
*
nb_quadrature_points
;
Real
*
epot_quad
=
epot_on_quad_points
.
storage
();
Matrix
<
Real
>
grad_u
(
spatial_dimension
,
spatial_dimension
);
for
(;
gradu_it
!=
gradu_end
;
++
gradu_it
,
++
stress_it
,
++
epot_quad
)
{
grad_u
.
copy
(
*
gradu_it
);
this
->
computePotentialEnergyOnQuad
(
grad_u
,
*
stress_it
,
*
epot_quad
);
}
}
/* -------------------------------------------------------------------------- */
INSTANTIATE_MATERIAL
(
elastic_orthotropic
,
MaterialElasticOrthotropic
);
}
// akantu
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