Question

Your company is designing a cap for a pressure vessel and needs to determine if it's viable. Given the figure above and the data below:

Determine the number of bolts to have a "Joint Factor of Safety" (Joint separation) of 4 or slightly over

Round the value up to nearest integer if necessary

Total force (P) from the pressure vessel

Pressure(ksi) = 60

Area (in^2) = 4

P_Total = 15000 lbf*

*Assume that applied force is distributed among the bolts

Bolt: 3/8-24 x 1.7 in UNF -2B SAE Grade 5 Hex head boltE (young's, MPsi) = 30

Carbon Steel bolt

Permanent connection? No

Bolt Condition: Nonplated

Washer:

Narrow or Wide? narrow

Plate 1:

Material - Carbon Steel

E = 30 MPsi

poisson's = 0.292

thickness = 0.5 in

Plate 2:

Material - Molybdenum

E = 48 MPsi

Poissons = 0.307

thickness = 1.0 in

Assume alpha for frustum = 30 degrees

Answer 1