(Solution) - A hollow steel bar G 80 GPa is twisted -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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A hollow steel bar (G = 80 GPa) is twisted by torques T (see figure). The twisting of the bar produces a maximum shear strain (max = 640 ( 10-6 rad. The bar has outside and inside diameters of 150 mm and 120 mm, respectively.
(a) Determine the maximum tensile strain in the bar.
(b) Determine the maximum tensile stress in the bar.
(c) What is the magnitude of the applied torques T?