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A panel of stiffener spacing \( 180 \) mm has an effective width of \( 71 \) mm on each side. The unworking central width is

  • A.142 mm
  • B.0 mm
  • C.38 mm
  • D.109 mm

Answer: C

The two effective strips total \( 142 \) mm, leaving \( 180 - 142 = 38 \) mm of buckled skin in the middle carrying essentially no direct stress. Widening the stiffener spacing further simply adds more unworking material.

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