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Discussion

Consider the following statements about the boom idealisation:

1. Booms carry direct stress and skin carries shear.

2. Part of each skin panel's area is credited to the adjacent booms.

3. The skin's direct-stress contribution is discarded entirely.

Which of the statements given above is or are correct?

  • A.1, 2 and 3
  • B.1 and 2 only
  • C.1 and 3 only
  • D.2 and 3 only

Answer: B

The first two describe the method. The third contradicts the second: the skin's contribution is not thrown away but lumped into the booms, which is what makes the idealised section carry the same direct load as the real one.

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