Discussion
Assertion (A): A domed rear pressure bulkhead is lighter than a flat one of the same strength.
Reason (R): A dome carries the pressure largely in membrane tension rather than in bending.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Membrane action uses the material uniformly through the thickness, whereas bending uses only the outer fibres effectively. The same argument explains why pressure vessels are round rather than square.
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