Card 10 / 36: Why did full-scale engineering-material specimens fracture at lower loads than expected in early metal airplanes (see specifically the Comet 1)? I. The effects of cyclic fatigue were not appreciated for airplane pressurization/depressurization. II. The effects of stress concentration at the corners of square windows were not appreciated. III. The effects of defect presence and growth were not appreciated for large structures
A)
I only
B)
Both II and III
C)
I, II, and III
D)
Both II and III
E)
Both I and III
Answer:
C) I, II, and III
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