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(a) Calculate the elastic bending moment M, that causes first yield in a beam of square cross-section bx b with tensile yield strength oy.

(a) Calculate the elastic bending moment M, that causes first yield in a beam of square cross-section bx b with tensile yield strength oy. Calculate the fully plastic moment M, in the same beam. What is the ratio of Mp/M? (b) Calculate the elastic torque Te that causes first yield in a shaft of radius R with shear yield strength o,/2. Calculate the fully plastic torque Tp in the same shaft. What is the ratio of Tp/Te? (c) Comment on the safety margin between initial yield and full plasticity in each case.

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