Discussion
Assertion (A): Widespread fatigue damage undermines the fail-safe philosophy.
Reason (R): Fail-safe design assumes an alternative load path remains intact when one member cracks.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. If many similar details crack at once the alternative paths are cracking too, and the linking of adjacent cracks can produce a failure far larger than any single-crack analysis predicted.
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