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Subject: Re: beginner in Ansys.
Author: Rick Fischer
Date: 2008-04-29 11:15:47
First, you need to read the netequitte on the xansys website and use a
proper signature.
First, understand that IGES does not support volumes. What you get from
IGES is a bunch of surfaces that, ideally, bound a volume. Ansys combines
them with the VA command to create a volume. So, your problem is one of
bad surfaces. What is happening is that one or more surfaces did not come
in correctly, so the volume is not bounded. First thing to do is display
the surfaces and look at them. Is a volume completely bounded? Do all
the surface edges line up? Sometimes a trimmed sculpted surface does not
come in trimmed. From the script you have at the end of your post (what's
the point of that?) it looks like you're using Ansys classic. Try the
Ansys import in Workbench. Workbench sometimes does a better job with
IGES than Classic. Also, set the model tolerance tighter in your CAD
package before you write the IGES file. Another thing to try is check
your CAD package to see if there are IGES export parameters that can be
adjusted. ProE, for instance, has a bunch of config commands that
determine how surfaces are exported, like "iges_out_spl_srfs_as_128 YES".
See if there are some options there that can help you. Another thing to
try is to import the IGES file back into your CAD package, then export it
in IGES again. That sometimes helps. Last, do you have any other
software there that reads and writes IGES? Try reading into that and
exporting another IGES file to Ansys. If none of that works, you can try
to fix the surfaces in Ansys. If a surface failed to come in and leaves a
face of the surface open, try making your own surface. Look at the A and
AL commands. IF s surface is not trimmed, you can try trimming it with
various boolian commands (ASBL, ASBA, etc.), or you can try deleting the
surface, and then recreating it from its lines.
Hope this helps.
Rick Fischer
Principal Engineer
Emerson Network Power
"Sungjun Lee"
Sent by: xansys-bounces_at_xansys.org
04/28/2008 06:31 PM
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[Xansys] beginner in Ansys.
Dear,
I am a very beginner in Ansys.
Recently, I am following some tutorial book with examples.
Some IGES file was not recognized in Ansys with warning message of
"Because keypoint merging has not been performed, automatic volume
creation is suppressed."
How to fix this warning message and show the model in Ansys?
Where can I find some more detail on IGES format?
Regards,
==========================
/FILENAM, seatbelt
/title, stress concentration
/prep7
k, 1, 0.0, 0.0
k, 2, 0.75, 0.0
k, 3, 1.125, 0.0
k, 4, 1.5, 0.0
k, 5, 1.5, 0.5
k, 6, 1.25, 0.75
k, 7, 0.0, 0.75
k, 8, 1.125, 0.375
k, 9, 1.09375, 0.40625
k, 10, 0.8125, 0.40625
k, 11, 1.75, 0.34375
k, 12, 1.25, 0.5
k, 13, 1.09375, 0.375
k, 14, 0.8125, 0.34375
L, 1, 2
L, 3, 4
L, 4, 5
L, 6, 7
L, 7, 1
L, 3, 8
L, 9, 10
L, 11, 2
LARC, 5,6,12,0.25
LARC, 8, 9, 13, 0.03125
LARC, 10, 11, 14, 0.0625
AL, all
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