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In the boom idealisation of a thin-walled section, the booms are assumed to carry

  • A.Shear only, with the skin carrying direct stress
  • B.Both direct and shear stress equally
  • C.No stress at all
  • D.Direct stress only, with the skin carrying shear only

Answer: D

Concentrating the direct-stress-carrying area into discrete booms and leaving the skin to carry shear reduces the section to a handful of areas at known positions. The bending calculation then becomes a summation rather than an integration, and the accuracy is good because the stringers really do carry most of the direct load.

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