Rough Contact, Key Option 12 = 1

The model behavior is
identical to standard contact, except sliding cannot occur during contact.

The magnitude of friction
stress is much greater than in standard contact in order to prevent sliding. The
greatest value of friction stress is -363,520 as compared to only -101,353 for
standard contact. Note also that in the standard contact case, the imposed
deflections were twice that of the rough contact case.
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