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How to define a surface through UEL?

Submitted by J.H. Zhai on

 Hello everyone,

 I want to  simulate contact problem by using UEL.I define the surface in the inp file.But abaqus don not 

recognize it. How can I solve this problem?

PS.  Sorry for my English.I hope it is clever enough to understand the problem.

Regards.

J.H. Zhai