A rod is made from two segments: AB is steel and BC is
Chapter 5, Problem 5-88(choose chapter or problem)
A rod is made from two segments: AB is steel and BC is brass. It is fixed at its ends and subjected to a torque of \(T=680 \mathrm{~N} \cdot \mathrm{m}\). If the steel portion has a diameter of 30 mm, determine the required diameter of the brass portion so the reactions at the walls will be the same. \(G_{\mathrm{st}}=75 \ \mathrm{GPa}\), \(G_{\mathrm{br}}=39 \ \mathrm{GPa}\).
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