August 2005

Engineering Case Histories

Case 28: Steel component fretting

The problem can greatly reduce component fatigue life

Sofronas, A., Consulting Engineer

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 s

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