Discussion
Assertion (A): The structure must show no detrimental permanent deformation at ultimate load.
Reason (R): Ultimate load is 1.5 times the limit load in civil design.
Select the correct answer from the options below.
Answer: D
The assertion is false and the reason is true. The no-permanent-deformation requirement applies at limit load. At ultimate the structure must merely not fail, and permanent set there is entirely acceptable since the aircraft is not expected to fly again.
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