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A plate's critical buckling stress is proportional to

  • A.The thickness-to-width ratio
  • B.The cube of the thickness-to-width ratio
  • C.The width-to-thickness ratio
  • D.The square of the thickness-to-width ratio

Answer: D

The plate formula carries the square of t over b, so halving the panel width for the same thickness quadruples its buckling stress. This is precisely why stringers are added to a skin: they shorten the panel and raise its buckling stress sharply.

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