A field engineer is checking material removed from the core of a circular shaft. Which technical note should be accepted? Avoid the common trap that polar moment depends only on area.
Choose the correct answer
removing core material always reduces strength in the same proportion as area
polar moment depends only on area
maximum torsional stress occurs at the inner radius
a hollow shaft can be more efficient by placing material away from the centre
Correct Answer
D. a hollow shaft can be more efficient by placing material away from the centre
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Torsional resistance benefits from material at larger radius. Correct option: D.
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