Discussion
Assertion (A): Window and door corners in a pressurised fuselage are generously radiused.
Reason (R): A sharp corner produces a severe stress concentration in a shell under hoop tension.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason for the first. The lesson was learned at considerable cost with the early Comet, whose near-square cut-out corners initiated fatigue cracks that led to the loss of the aircraft. Corner radii are now a fundamental design rule.
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