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Question 4 The prismatic bar shown, made of a steel assumed to be Elasto-plastic with GYIELD = 290 MPa, is subjected to a couple

Question 4 The prismatic bar shown, made of a steel assumed to be Elasto-plastic with GYIELD = 290 MPa, is subjected to a couple M parallel to the Z axis. Determine the moment M of the couple for which (a) yield first occurs, (b) the elastic core of the bar is 2.5 mm thick. 12 mm 8 mm

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