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Crippling of a stiffener refers to

  • A.Fatigue cracking at a fastener hole
  • B.Yielding of the whole cross-section
  • C.Separation from the skin
  • D.Local buckling of its flanges

Answer: D

The individual flanges buckle locally at a stress below the material's yield, and the section's capacity is governed by that rather than by column buckling or yield. Crippling stress is estimated from empirical methods based on flange width-to-thickness ratios.

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