Comprehensive and Detailed Explanation From Exact Extract:
Per API RP 571, mechanical fatigue failures are identified by the presence of beach marks or clam shell patterns on the fracture surface.
These features:
Appear as concentric rings
Represent successive crack growth increments
Radiate outward from the crack initiation site
This “clam shell” or “beach mark” appearance is one of the most recognizable signatures of fatigue failure.
Referenced Documents (Study Basis):
API RP 571 – Section on Mechanical Fatigue
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