There is no harm in asking any question .However I would advise you to get whatever work you do checked by any senior stress engineer in your organization as forum memebers can answer your questions but cannot check your work , which for your level of experience is must.
Besides, to answer your query , pl. read the chapter on Friction in the Technical reference manual of CAESAR ( under Technical discussions), use the knowledge you have gained( hopefully) in your strength of materials course and use common sense.
Regards
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anindya