Are there any ANSYS Workbench Simulation 9.0 examples using orthotropic
elastic material properties? What is needed in the command snippets?


ANSYS Workbench Simulation 10.0 (scheduled to be released via web
download from the Customer Portal starting on 8/9/2005) will support
orthotropic material properties, but you will still need to define your local
coordinate system to be used for the element coordinate system. In 9.0,
you need to go one step further and define the material properties in a
command snippet. In the next release (Workbench Simulation 11.0), we
will be supporting the .RST file directly, instead of copying everything over
to .XML files for postprocessing. I suspect we will then be able to support
a lot more in terms of laminated composite structures. Anyhow, ...

Please find attached a simple example of a pressurized pipe in ANSYS
Workbench Simulation 9.0. The two command snippets are shown below,
as well. Incidentally, the fiber direction in this example was made to be
in the axial direction, which would help support axial and bending loads,
but only internal pressure is included in this particular example ...


! = = = = = = = = = = = = == = = = = = = = = = = = = = = = = = = = = = = = = = = =


! Commands inserted into this file will be executed just after material definitions in /PREP7.
! The material number for this body is equal to the parameter "matid".

! Active UNIT system in Workbench when this object was created: U.S. Customary (in, lbm, lbf, F, s)

esel,s,mat,,matid ! "matid" is a temporary variable currently set to this part ...
cm,ecomp,elem ! elements in composite ring

! Uni-directional graphite/epoxy mechanical property data

mp, ex, 1, 2.470E+07 ! psi
mp, ey, 1, 1.200E+06 ! psi
mp, ez, 1, 1.200E+06 ! psi
mp, prxy, 1, 0.2881667 !unitless
mp, prxz, 1, 0.2881667 ! unitless
mp, pryz, 1, 0.1000000 ! unitless
mp, gxy, 1, 7.200E+05 ! psi
mp, gyz, 1, 1.980E+05 ! psi
mp, gxz, 1, 7.200E+05 ! psi

emodif,all,esys,12 ! local cylindrical system with origin at (-4,10,0)

! Note: The local cylindrical system cannot map the X-axis onto
! the surface of the shell (a radial line becomes a point),
! so the Y-axis is mapped in the circumferential direction
! and since the Z axis must be through the thickness, the
! X-axis becomes the cross product of the Y and Z axes, which
! equates to the axialdirection ...

esel,all


! = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =


! Commands inserted into this file will be executed immediately after the Ansys /POST1 command.
! If a SET command is issued, results from that load step will be used as the basis of all
! result objects appearing in the Solution folder.

! Active UNIT system in Workbench when this object was created: U.S. Customary (in, lbm, lbf, F, s)

/rgb,index,100,100,100, 0
/rgb,index, 80, 80, 80,13
/rgb,index, 60, 60, 60,14
/rgb,index, 0, 0, 0,15

/plopts,info,1
/view,,1,1,1
/eshape,1
set,last
/edge,,1
/dscale,,1

rsys,12 ! local cylindrical coordinate system

/show,png
plnsol,u,sum,2

/graph,full ! PowerGraphics documented to ignore SHELL,TOP/BOT

shell,top
plnsol,s,x
plnsol,s,y
plnsol,s,z

shell,bot
plnsol,s,x
plnsol,s,y
plnsol,s,z

/dev,vect,1
/psym,esys,1
/vscale,,1.0
/eshape,0
eplot/show,close

rsys,0 ! need to reset RSYS for XML plots ...
/graph,power ! switch back to Power Graphics ...


! = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

P.S. In the case of solid elements (as opposed to shells), the resulting element
coordinate systems for this example would align the local X-axis as radial,
the local Y-axis as circumferential (hoop), and the local Z-axis as axial (in
the +Z global Cartesian direction). Incidentally, the local element systems
are Cartesian systems that are parallel to the cylindrical system specified.





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