Discussion
Consider the following statements about curved compression panels:
1. Curvature raises the buckling stress relative to a flat panel.
2. Real curved shells are imperfection-sensitive.
3. Classical shell theory predicts the failure load accurately.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: curvature stiffens a panel against buckling, and real shells are acutely sensitive to initial imperfections. Statement 3 is exactly what those imperfections falsify - classical shell theory assumes a perfect geometry and overpredicts the failure load, sometimes by a factor of three or four, which is why knockdown factors derived from test are applied instead.
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