Discussion
Assertion (A): Fretting can cut a joint's fatigue strength by half or more.
Reason (R): Micro-slip between clamped surfaces damages them and creates early initiation sites.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. Lap joints and bolted fittings are the usual locations, and the remedy is to reduce the slip through clamping or to protect the interface with a coating or shim.
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