Question: A solid circular bar of diameter d = 50 mm (see figure) is twisted in a testing machine until the applied torque reaches the value

A solid circular bar of diameter d = 50 mm (see figure) is twisted in a testing machine until the applied torque reaches the value T = 500 N ( m. At this value of torque, a strain gage oriented at 45° to the axis of the bar gives a reading Ïµ 339 ( 10-6.
What is the shear modulus G of the material?

Strain gage d 50 mm T-500 N.m 45

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