Thank you for your reply！
I think it's because I didn't express it clearly, so I’ll try to simplify the problem.
The external load is a random force.
When this external load F < μ|FN|, it sticks. When F = μ|FN|, sliding occurs. When F > μ|FN|, it's sliding and its frictional force equeals to μ|FN|.
I searched ANSYS contact behavior and I think the frictional contact behavior almost meets my requirements.
But for conta178 element, there is no frictional contact behavior to choose.
Can element conta178 use the frictional contact behavior? or I have to write my own contact behavior.
Thanks for your reply again!
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