The normal strain in the 45° direction on the surface of a circular tube (see figure) is 880 ( 10-6 when the torque T = 750 lb-in. The tube is made of copper alloy with G = 6.2 ( 106 psi.
If the outside diameter d2 of the tube is 0.8 in., what is the inside diameter d1?

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Strain gage d2 0.8 in. T = 750 lb-in. 45°