Discussion
Consider the following statements about a compression-critical stiffened panel:
1. Effective width depends on the stiffener stress.
2. Crippling stress limits how hard the stiffener can be worked.
3. The two effects can be assessed entirely independently.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: effective width depends on the stiffener stress, and crippling caps how hard the stiffener can be worked. Statement 3 is wrong, and it is the practical point - the two are coupled, since the effective area determines the stress and the stress determines the effective area, so the panel is sized by iterating on both together rather than by treating each on its own.
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