Contact, Friction, and Wear of Threaded Fasteners
Synonyms
Definition
The performance of the bolted joint is dependent on the contact conditions, the friction coefficients and the wear conditions on the contact area. Understanding the tribology of threaded fasteners is critical to the safety and reliability of many bolted assemblies that are used in the vast majority of mechanical and structural systems. A simple bolted connection may just include a threaded fastener (bolt/screw/stud), a nut or tapped hole in one of the clamped parts, and the parts that would be clamped together by preloading the bolt when the engaged threads are turned relative to each other by applying a torque. The fastener preload and the resulting initial clamp load in the joint are dominated by the frictional characteristics of the sliding bearing surface under the rotating bolt head (or nut) and between the sliding engaged threads. Typically, 90% of the input...
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