BOLT

QUESTION 1   

this is the cross section taken from pressure cylinder. A total of N bolt is to be used to resist a separating force of 160kN.

(a)  find the stiffness and constant C

(b)  find minimum number of bolts required using a factor of safety of 2 and accounting for the fact that the bolts may be reused when joint is taken preload?

Note : the size of bolt= M16 * 2 . The material of member E=79GPa. Flange area 1.5 times of diameter of bolt. And t=l/2.

, Proof strength, yield strength

Question 2

Two shafts are connected by means of a flange coupling to transmit torque 250Nm.

The flanges are fastened by four bolts of same material at radius of 30mm.

Find the standard size bolt if the allowable shear stress for the bolt material is 300MPa.

Question 3

Permissible shear stress for welds shown is 140MPa. For each case find the load F  that would cause such a shear stress

b

a