Part 'B' - Bolted Joint Design
N = No. of bolts = 4
W = Weight of bracket and pulley = 175 lb.
P = Load on each side of rope on pulley = 6000 lb.
n = 2
The bolts' selection has to be based upon a stress analysis of the shear stresses and tensile stresses (due to bending) acting on the bolts
V = Total shear load acting upon the bolts due to the loads and the weight
N = No. of bolts
As = Area of shear of the bolts - table (8-2)
Sy = Minimum yield strength of the bolt - table (8-4)
Tensile force on each upper bolt due to bending is given by:
where:a is the summation of bending moments about point 'O' on the upper bolts
y is the distance between point 'O' and the upper bolts
Therefore, the tensile stress on each bolt is:
t is the tensile area of the bolt - table (8-2)
St is the minimum tensile strength of the bolt - table (8-4)