The radius taken into consideration in calculating the stress in a hollow shaft subjected to torsion is
The following torsional terms is analogous to bending terms except
The safe twisting moment for a compound shaft is equal to the
If we take maximum calculated value, shear stress developed in other shaft of compound shaft would exceed the permissible design stress. This will fail the design, so minimum calculated value is taken as safe twisting moment.
The ratio of maximum shear stress to maximum normal stress at any point in a solid circular shaft is
(Mohr’s circle for shaft subjected to torsion)
Radius of circle
Strain energy stored in a solid circular shaft is proportional to
The value of shear stress which is induced in the shaft due to the applied couple varies
Shear stress induced in a shaft subjected to tension will be
Two solid shafts are made of same material and have their diameters D and D/2. The ratio of strength of bigger shaft to smaller one in torsion is
Strength means torque carrying capacity
Compare the strengths of solid and hollow shafts both having outside diameter D and hollow shaft having inside diameter of D/2 in torsion. The ratio of strength of solid to hollow shafts in torsion will be
Torsion bars are in series








