While reviewing material removed from the core of a circular shaft, which conclusion is correct? Avoid the common trap that removing core material always reduces strength in the same proportion as area.
Choose the correct answer
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
removing core material always reduces strength in the same proportion as area
Correct Answer
C. 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: C.
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