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Idealising a wing box into booms and shear-carrying skin is justified because

  • A.Stringers and caps carry most direct stress
  • B.The skin carries no load whatever
  • C.The section is always symmetric
  • D.The bending moment is always zero

Answer: A

Most of the direct-stress-carrying area is concentrated in the stringers and caps, and the skin contributes a share that can be lumped into the adjacent booms. The idealisation is an accounting convenience that reflects where the material actually is.

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