The torsion equation is derived on the basis of following assumptions:
> The shaft material is uniform, throughout the shaft.
> Even after loading the shaft circular remains circular.
> After the application of torques the plain section of a shaft remains plain.
> Any twist that occurs in the shaft remains uniform and constant.
> After the application of torque the distance between any two cross-sectional references remains constant.
> The elastic limit value of a shaft is never exceeded even after the shear stress induced because of torque application.
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