Discussion
Consider the following statements about cut-outs in a torsion box:
1. They interrupt the circulating shear flow locally.
2. Heavy edge members are used to carry the diverted load.
3. A latched structural door can restore much of the shear path.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1, 2 and 3
All three are correct and together they describe how cut-outs are handled. An opening breaks the circulating shear flow, so the load must divert around it; heavy edge members and corner fittings are provided to carry that diverted load; and a door that latches structurally at several points can restore a large part of the shear path, which is why undercarriage and cargo doors are designed to do so.
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