Question: A torsion bar is to have a solid circular cross#section. It is to carry a fluctuating torque from 30 to 65 N m. Use

A torsion bar is to have a solid circular cross#section. It is to carry a fluctuating torque from 30 to 65 N m. Use SAE 4140 OQT 1000 for the bar, and determine the required diameter for a design factor of 2. Attachments produce a stress concentration of 2.5 near the ends of the bar. Calculate the minimum diameter required based on the given loading and design factor in mm's.

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