Discussion
Assertion (A): Aluminium airframe components are given a finite fatigue life rather than an endurance limit.
Reason (R): The aluminium S-N curve continues to fall rather than flattening to an asymptote.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. Since no stress is safe indefinitely, an aluminium structure is quoted with a fatigue strength at a stated number of cycles and managed through inspection rather than declared immune.
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