n the figure, torsional moments act on a bar system of abruptly changing cross-section made of the same material. Accordingly, calculate the value of the factor α so that the support responses are of the same magnitude in absolute value. What must the torsional moment=Mb be for the D-end to be zero? Note: The shear modulus of the material is G = 80 GPa Mo= 10 kNm.

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A: GivenE=100GPaA=340mm2L1=810mmL2=1080mma=480mmb=38mmc=600mmσlim=165MPa

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Q: Parvinbhai

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A: r1 = 6.9 mm r2 = 11.11 mm L1 = 1.52 m L2 = 1.29 m P = 2.1 kN

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Torsion

In mechanical engineering, torque, torsion, and twisting moment are three of the most important concepts which have different meanings. Torque is the consequence of a moment of a force that produces an angular acceleration in a body or induces rotational kinetic energy in a body. For instance, in an automobile, the power transmission shaft is a body that is always under rotation due to the external torque acting on it, this torque is created by the engine.