Problem 2 (10 points): The figure shows a pressure vessel for which D = 4

in, t = 3/8 in, L = 12 in, and w = 3/4 in. Both brackets as well as the cylinder are

of steel. Six 3/8-in SAE grade 5 coarse-thread bolts are used, tightened to 75

percent of proof load. The bolt and member stiffness values are 0.245 and

2.148 M lbf/in per bolt respectively. Assume the bolts are unthreaded within

the grip.

(a)

(b)

What pressure would be required to cause total joint separation?

Using the Goodman fatigue criterion, determine fatigue safety factor

if the working pressure cycles between 1200 psi and 2000 psi.

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UT

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