Discussion
A component shows a margin of seven per cent between its current stress intensity and the fracture toughness. The correct action is
Answer: B
Correct answer: Ground the aircraft; the crack is close to critical
Seven per cent is not an engineering margin. The stress intensity grows with the square root of the crack length, so a small further extension exhausts it, and the structure is one overload away from unstable fracture. The aircraft is withdrawn and the member repaired or replaced before further flight.
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