A design assistant has to decide on material removed from the core of a circular shaft. Which statement is sound? Avoid the common trap that polar moment depends only on area.
Choose the correct answer
polar moment depends only on area
a hollow shaft can be more efficient by placing material away from the centre
removing core material always reduces strength in the same proportion as area
maximum torsional stress occurs at the inner radius
Correct Answer
B. 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: B.
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