A circular aluminum tube subjected to pure torsion by torques T (see figure) has an outer radius

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A circular aluminum tube subjected to pure torsion by torques T (see figure) has an outer radius r2 equal to 1.5 times the inner radius r1.
(a) If the maximum shear strain in the tube is measured as 400 ( 10-6 rad, what is the shear strain y1 at the inner surface?
(b) If the maximum allowable rate of twist is 0.125 degrees per foot and the maximum shear strain is to be kept at 400 ( 10-6 rad by adjusting the torque T, what is the minimum required outer radius (r2)min?
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Mechanics of Materials

ISBN: 978-0495438076

7th edition

Authors: James M. Gere, Barry J. Goodno

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