Discussion
Assertion (A): Curved shell buckling predictions carry large empirical knock-down factors.
Reason (R): Real shells are highly sensitive to small geometric imperfections.
Select the correct answer from the options below.
Answer: A
Both are true and the second explains the first. Test loads far below classical theory were a long-standing puzzle until imperfection sensitivity was understood, and the factors encode that experience rather than any refinement of the theory.
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