Date : 16/06/2015 Page : 1/5 Révision Clé : V7.31.140
:
ac21d99382fe
WTNV140- Drained elastic triaxial compression test anisotropic
Summary: This test validates the mechanical part of the transverse anisotropy in THM. It is about a triaxial compression test with null pressure. This test can thus be compared with a case of pure mechanics. The reference of anisotropy will be different from the principal coordinate system. One tests various geometries (3d, 2d, AXI). Modelization A is an elastic case in transverse 3d isotropy treated in pure mechanics then in HM. Modelization B is an elastic case in 2d orthotropic treaty in pure mechanics then in HM. Modelization C is an elastic case in axisymmetry treaty in pure mechanics then in HM.
Warning : The translation process used on this website is a "Machine Translation". It may be imprecise and inaccurate in whole or in part and is provided as a convenience. Licensed under the terms of the GNU FDL (http://www.gnu.org/copyleft/fdl.html)
Date : 16/06/2015 Page : 2/5 Révision Clé : V7.31.140
:
ac21d99382fe
z e
h y
x
l
height: h=1m width: l=1 m thickness: e=1 m One will also distinguish for modelizations C and D, a geometry 2d of
1.2
1m×1m .
Material properties •
General case 3d (transverse isotropy)
Parameters specific to ELAS_ISTR :
%E L =9 GPa %E N =18GPa N LT =0.24 N LN =0.48 G LN =8.88 GPa The transverse reference of anisotropy is defined by the nautical angles =30 ° and =−60 ° . •
General case 2d (orthotropy)
Parameters specific to ELAS_ORTH : One will make for modelizations C and D which are D_PLAN, an alternative by considering that the 2d plane corresponds to the plane of anisotropy. In this case:
%E L =9 GPa %E T =18 GPa and %E N =9 GPa N LT =0.48 N LN =0.24 Ν%TN =0.48 G LN =8.88 GPa The transverse reference of anisotropy is defined by the nautical angle
=40 ° .
Parameters related to the THM (here without impact since the pressure is kept null: PORO=0.14 , coefficients of Biot B L =0.3 and B N =0.6 .
•
1.3
Boundary conditions and loadings On edge plane
x=1m : application of containment P=25MPa
Warning : The translation process used on this website is a "Machine Translation". It may be imprecise and inaccurate in whole or in part and is provided as a convenience. Licensed under the terms of the GNU FDL (http://www.gnu.org/copyleft/fdl.html)
Date : 16/06/2015 Page : 3/5 Révision Clé : V7.31.140
:
ac21d99382fe
On edge plane z=1m : application of containment P=29MPa (case 3d) On edge plane y=1m : application of a displacement of 0,01 m according to a gradient of 1s . Symmetry conditions are applied to the other edges and the pressure is kept null everywhere (global coefficient).
1.4
Initial conditions The initial stresses are anisotropic (in the global level), that is to say: xx=−25MPa ; yy =−22MPa ; zz =−29MPa
2
Reference solution For each modelization, a computation in pure mechanics is used as reference to computation THM.
Warning : The translation process used on this website is a "Machine Translation". It may be imprecise and inaccurate in whole or in part and is provided as a convenience. Licensed under the terms of the GNU FDL (http://www.gnu.org/copyleft/fdl.html)
Date : 16/06/2015 Page : 4/5 Révision Clé : V7.31.140
:
ac21d99382fe
Modelization A Modelization A is a case of pure mechanics in transverse isotropy 3d (modelization already validated in addition) followed by same in modelization HM (elastic saturated modelization).
3.1
Characteristics of modelization Modelization 3D_SI then Modelization 3D_HMS
3.2
Characteristics of the mesh 5×5×5 of type HEXA20 and 150 QUAD8
Number of meshes:
3.3
Quantities tested and results Displacements will be observed DX and DZ at point of coordinates 1,1,1 , that is to say and displacement in DY at point of coordinate 0.8,0 .2 ,0 .8 that is to say N216
N7
It is checked that the results in HM are the same ones as in pure mechanics, which is used as reference: Node
N7 N7 N216
4
Moment 1 1 1
Quantity
DX DY DY
Reference Pure mechanical model Pure mechanical model Pure mechanical model
Aster - 5.98e -3 - 3.569e -3 - 1.965e -3
Modelization B Modelization B is a case of pure mechanics orthotropic 2d (modelization already validated in addition) followed by the same modelization in HM (elastic saturated modelization).
4.1
Characteristics of modelization Modelization D_PLAN then D_PLAN_HMS.
4.2
Characteristics of the mesh Number of meshes:
4.3
90 of type TRIA6 and 24 SEG2
Quantities tested and results Displacements will be observed is to say N32 .
DX and DY at the central point of coordinates 5.38,4 .85 , that
It is checked that the results in HM are the same ones as in pure mechanics, which is used as reference: Node
Moment
Quantity
Reference
Aster
Warning : The translation process used on this website is a "Machine Translation". It may be imprecise and inaccurate in whole or in part and is provided as a convenience. Licensed under the terms of the GNU FDL (http://www.gnu.org/copyleft/fdl.html)
Date : 16/06/2015 Page : 5/5 Révision Clé : V7.31.140
Pure mechanical model Pure mechanical model
:
ac21d99382fe
3.68e -3 -4.98e -3
Modelization C Even thing that modelization B but in axisymmetry.
5.1
Characteristics of modelization Modelization AXIS then AXIS_HMS.
5.2
Characteristics of the mesh Number of meshes:
5.3
90 of type TRIA6 and 24 SEG2
Quantities tested and results Displacements will be observed is to say N32 .
DX and DY at the central point of coordinates 5.38,4 .85 , that
It is checked that the results in HM are the same ones as in pure mechanics, which is used as reference: Node
N32 N32
6
Moment 1 1
Quantity
DX DY
Reference Pure mechanical model Pure mechanical model
Aster 2.997e -3 -4.886e -3
Conclusion Anisotropic modelizations THM are coherent with anisotropic mechanical modelizations.
Warning : The translation process used on this website is a "Machine Translation". It may be imprecise and inaccurate in whole or in part and is provided as a convenience. Licensed under the terms of the GNU FDL (http://www.gnu.org/copyleft/fdl.html)
