Case 28:Steel component fretting

摘要

My background is not metallurgy and whenever a problem involving corrosion occurs I always contact a materials engineer for advice.Why,then,am I discussing fretting? Simply because the problem always comes up and is one of the most difficult to solve.While a metallurgical analysis can tell when it is present,it cannot always determine how to remedy it.Fretting has been experienced by the author on splines;bearing outer and inner races,gear-shaft and shaft coupling fits;geared coupling teeth;bolted joints;aluminum riveted joints of aircraft structures;keys and keyways in shafts and hubs;universal joint pivots and leaf and coil spring interfaces.Fretting is not limited to steels and has also,been observed on high-speed breaker pivot points on a polymer material.