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A different coefficient of friction (COF) can be specified between a pair of parts or pair of part sets of a single-surface contact by setting FS = -2 on the *CONTACT keyword and by referencing a *DEFINE_FRICTION keyword ID through FD field. Please see Manual Vol I for the supported contact types. The *DEFINE_FRICTION keyword is interpreted as follows. – If FS = -2 and FD = 1 on *CONTACT, the COF is defined by the *DEFINE_FRICTION keyword with ID = 1. – For all parts included in the SSID set referenced by the single-surface *CONTACT but not included in the part set PIDi or PIDj of *DEFINE_FRICTION the COF is equal to the FS_D on *DEFINE_FRICTION. – The COF is equal to the FS_IJ (of *DEFINE_FRICTION) when a part included in set PIDi comes into contact with parts that belong to set PIDj. – For contact in-between the parts of the set PIDi, the COF is FS_D. Likewise, the COF is FS_D for contact in-between the parts of the set PIDj.