Shear stress strain diagram and modulus of rigidity

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The shear stress-strain diagram for an alloy is shown in the figure. If a bolt having a diameter of 0.25 in. is made of this material and used in the lap joint, determine the modulus of elasticity E and the force P required to cause the material to yield. Take nu = 0.3. Problem 3.33 Hibbeler Mechanics of Materials 10th edition

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This video is an absolute lifesaver. I've been struggling with stress analysis for a while and this was a very useful nudge with this kind of problem.

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