Linear elasticity theory. Part 6. Torsion revisited.

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Please I need a solution for this app Let the extreme cross section of a circular prismatic bar with axis be acted on by couples whose moments are equal in magnitude but opposite in sense in this case the bar is subjected to torsion. If this assumption is taken into consideration, the projections of the displacement vector of some point in a certain cross section of the bar are, , where is the constant angle of twist per unit length of the bar.