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Contact problem with initially un-contact domains, is it necessary to have concave convex for destination and source

Posted Mar 2, 2011, 7:09 p.m. EST Structural Mechanics Version 4.1 2 Replies

Xiaogai Li
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Hi!

Have a question about contact. Noticed that there are many discussions on this topics, now I have a rather basic question.

In the documents, I read that
"For each destination point where the operator or gap is evaluated, a corresponding source point is sought by searching in the direction normal to the destination boundary. ......
The source should be concave and the destination be convex rather than the opposite",

This seems to me that it is a MUST that the contact should be source is concave, and destination is c convex, otherwise there will be difficult or impossible to search the corresponding point.

But I did two simple examples, one with two rectangulars, initially uncontact. And one with two concave (or convex) for both. Both models works.

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Now my question is: why in the documents say so, seems it is not a MUST to have the source concave and the destination be convex ?
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Attached is the two simple examples in version 4.0a.
Thanks a lot.
XLi
2 Replies Last Post Mar 9, 2011, 5:52 a.m. EST
Ali
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Posted: 1 decade ago Mar 9, 2011, 5:12 a.m. EST
hi,
I have problem with contact in 2D, I model a long beam with small cross section area. and I have a block below it. I want to define contact between block and beam but it goes inside the block. It seem you know how contact works.
would you please help me?

I attached my file
hi, I have problem with contact in 2D, I model a long beam with small cross section area. and I have a block below it. I want to define contact between block and beam but it goes inside the block. It seem you know how contact works. would you please help me? I attached my file

Attachments:

Xiaogai Li
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Posted: 1 decade ago Mar 9, 2011, 5:52 a.m. EST
Hi! Sorry, I only have little experience in solid-solid contact.
I've no idea how to contact beam with solid. Hope some others could
help you.
XLi
Hi! Sorry, I only have little experience in solid-solid contact. I've no idea how to contact beam with solid. Hope some others could help you. XLi

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