Question: A solid circular bar having diameter d is to be replaced by a rectangular tube having cross-sectional dimensions d ( 2d to the median line

A solid circular bar having diameter d is to be replaced by a rectangular tube having cross-sectional dimensions d ( 2d to the median line of the cross section (see figure).
Determine the required thickness tmin of the tube so that the maximum shear stress in the tube will not exceed the maximum shear stress in the solid bar.

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