The steel tube with the cross section shown is transmitting a torsional moment of 100 N · m. The tube wall thickness is 2.5 mm, all radii are r = 6.25 mm, and the tube is 500 mm long. For steel, let E = 207 GPa and υ = 0.29. Determine the average shear stress in the wall and the angle of twist over the given length. Use 2.5-mm-thick plate elements.

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