Discussion
Assertion (A): Skin is idealised as carrying shear but not direct stress.
Reason (R): In a stiffened structure the stringers and caps hold most of the direct-stress-carrying area.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. The idealisation reflects where the material actually is, and the skin's own direct-stress contribution is credited by lumping part of its area into the adjacent booms rather than being discarded.
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