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Assertion (A): Access panels in a wing torsion box are ringed with heavy edge members.

Reason (R): A cut-out interrupts the circulating shear flow that carries the torque.

Select the correct answer from the options below.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the second explains the first. The load must divert round the opening, and without stiff edge members the local behaviour tends towards that of an open section, with a collapse in torsional stiffness across that bay.

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