A structure is made by welding a circular cross-section steel shaft (E=200 GPa, G=77 GPa), of length 1 m and diameter 50 mm, to a rectangular cross-section steel beam of length 1.5 m and cross-section dimensions 60 mm by 20 mm. A torque T2.5 kN-m is applied to the free end of the shaft as shown. (a) What is the location that the stress concentration may happen? (No need to calculate the value, just the location.) (b) Ignore the stress concentration, determine the rotation of the free end of the shaft. [Hint: Either use energy method, or analyze bending of rectangular beam and torsion of circular beam]
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