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Optistruct - large contact forces

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Hi All,


I seem to have a recurring issue and it doesn't seem to make much difference if I use S2S or N2S. 


I have a number of very similar models, all set up the same way and I would only expect a mild difference in stress distribution and contact. What I get is with some of the loadcases I have an extremely high contact force. Now I've encountered this before and have needed to switch to gaps but this time I really do need the contact forces exported. 


Here are some notes.....



Contact card  = Adjust = auto, type = slide, MORIENT = Norm.

In general, slave contact surface is smaller mesh size. 


I've added some images....



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Hello Andy,


In your case, I would recommend the following for the CONTACT card:




SRCHDIS= check your distance, small value

ADJUST=NO (be carefully with AUTO, I would not take it!!)

CLEARANCE=0 (if it is a closed contact at the beginning)

DISCRETE=S2S (contact is smoother, better in general)


Try the model without friction first, if it works fine you can add friction.


Best Regards,




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