femap the same face id connection

[wojtekmath]

Hi

I made model with contact. When i'm starting analize then appear message: all faces must have the same ID.

I must make lot of conection regions.

My model is made from 2 solids.

First one: plate
Second one: pillars

force is connected to plate is based on pillars

something like:

http://www.imfitex.com/data/photos/pa111519.jpg

-inside is water

I want have one face id on one solid.

Thanks.

 

[BlasMolero]

Hello!,
This means that you have created contact regions where contact sides don't have the same side ID, all elements "faces" in a region must have the same side ID, positive or negative. When defining contacts between solids, all contact "faces" in a region are positive by nature, this is inherent to solid meshing, but if you mix Shell with Solids (or Shell with Shell in the same region), you may assure that shell orientation is consistent, ie, TOP face is selected.

• The "SURF" parameter is used by the NX NASTRAN solver to define the contact side of shell element regions. When SURF is "TOP", the contact side is consistent with the shell element normal and when "BOT" the opposite. In a SOL 101 (including consecutive solutions 103, 111 and 112), SURF must be defined so that source and target contact sides either face one another to represent a separation condition, or oppose one another to represent an interference condition.

Understanding shell element normals, and making sure those in the same regions are consistent is very important to ensuring that contact elements will be created as expected. See “Using Consistent Normals” in the NX Nastran User's Guide for information on using consistent shell normals.

Best regards,
Blas.


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Blas Molero Hidalgo
Ingeniero Industrial
Director

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