Determine the shear stress in the bolts

[Shivansh Joshi]

Homework Statement

Two coaxial shafts are to be connected by a flanged coupling having six 15 mm diameter bolts equally spaced around a 300 mm diameter pitch circle. Determine the shear stress in the bolts when 300 kW is transmitted at 400 revs/min;
(i) Assuming the bolts are equally loaded
(ii) Assuming one bolt to be ahead of the others and carrying the entire torque

Homework Equations

Shear stress (MPa) = Force (Newtons) / Area (mm^2)
Torque = power/ angular velocity

The Attempt at a Solution

I found torque but can't work out the shear stress. Also part (ii) of the question is confusing me.

 

[Chestermiller]

The bolts transfer torque across the flange. Since you say you have calculated the torque, what does that give you for the shear force at each bolt?

 

[Shivansh Joshi]

The bolts transfer torque across the flange. Since you say you have calculated the torque, what does that give you for the shear force at each bolt?

I know that shear stress = shear load/ cross sectional area of bolt. But don't know how to work this out with torque

 

[Nidum]

 

[Chestermiller]

Torque = force times radius