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A long plate in compression buckles into half-waves that are

  • A.Very much shorter than the plate width
  • B.Circular in plan
  • C.Roughly square half-waves
  • D.As long as the plate itself

Answer: C

The plate finds the cheapest mode, which turns out to make each half-wave about as long as the panel is wide. This is why the buckling coefficient becomes insensitive to length once the plate is more than a few widths long.

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