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Subject: Re: top down model associatively
Author: Monte McGlaun
Date: 1999-01-14 08:03:00Don,
I know of no way to create associative solid models from FE entities. We
routinely create nodes and elements within Unigraphics and import them into
ANSYS. We use the following steps to tie solid geometry to the nodes &
elem:
- create keypoints at nodes: knode,-1,p (the kp's are coincident to
the nodes
but NOT assoc)
- create lines at keypoints
- mesh lines with Beams
- NUMM,node to "tie" the new meshed solid geometry into the original
nodes
- apply loads to nodes & elem or to the new solid geometry
If you want the mesh of an area or volume to match the imported nodes and
elem, then you have a chore on your hands unless the FE mesh is very
uniform. For these cases, there are two other solutions that come to mind:
- Create and mesh solid geometry that has a mesh in the ball park as
the imported
FE mesh. Use coupled nodes to transfer loads between the two.
CPINF will snag
nodes within a radius and tie them together. The down side is
that stress info
in the immediate region of the coupled nodes will be wrong
- Secondly, a new solution is available with 5.5 - flex surface to
flex surface
contact (Target 170 and Contact 173 or 174 for 3D). The element
has a keyopt
to make the interface bonded. I just completed a run of an
adhesively bonded
repair. Although I have good solid geometry for the interfacing
parts, the meshes
were completely different. I needed to transfer loads across the
boundary. The
new contacts solved very well. More importantly, the stresses at
the interface
are valid. Downside is CPU time; this is a nonlinear solution.
Monte
* Monte A. McGlaun
Drive Systems Analysis
Bell Helicopter Textron, Inc.
Box 482
Fort Worth, Texas 76101
(817) 280-5820 voice, -2239 FAX
mmcglaun@b...
-----Original Message-----
[mailto:shaffedl@o...]
Sent: Wednesday, January 13, 1999 3:14 PM
To: xansys@o...
Hello,
Reading in the user manual the description says
the user may create the model from the bottom
up or from the top down. I want to create the
nodes and elements; then create the associativity
to created full volumes, areas, lines and keypoints.
How to do this without creation of a specific macro
is my question. I have seen the message about
making the volumes from tets. But does ANSYS have
the user capability to create the association of a set
of nodes say to an assembly of lines, areas, keypoints, etc.
This would allow the use of geometry for placing the loads.
Would like to hear opinions whether this is good/bad.
Don Shaffer
Siemens Westinghouse Power Corporation
Orlando, Florida