2. The maximum shear stress of a steel bar 20mm in diameter is reached if it is subjected to a torque of 185N-m. At this stress the angle of twist measured over a length of 0.15m is found to be 1.3°. Calculate the (a) Maximum shear stress experienced by the bar (b) Modulus of Rigidity of the bar material (8 Marks) (8 Marks) (c) Minimum diameter required of a solid shaft to transfer a Torque of 7640N-m if a factor of safety of 4 is factored into maximum shear stress. (9 Marks)

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The maximum shear stress of a steel bar

20 mm

in diameter is reached if it is subjected to a torque of

185 N ? m

. At this stress the angle of twist measured over a length of

0.15 m

is found to be

1. 3^{?}

. Calculate the (a) Maximum shear stress experienced by the bar (8 Marks) (b) Modulus of Rigidity of the bar material (8 Marks) (c) Minimum diameter required of a solid shaft to transfer a Torque of

7640 N ? m

if a factor of safety of 4 is factored into maximum shear stress. (9 Marks)

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