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  3. 5. a fluctuating external load of ppeak = 4500 lb

5. A fluctuating external load of Ppeak = 4500 lb is applied at the bolted joint...

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Mechanical Engineering

5. A fluctuating external load of Ppeak = 4500 lb isapplied at the bolted joint given in Problem 4.
(1) Find the factor nf of safety against the fatiguefailure using the modified Goodman criterion.
(2) Find the factor np of safety using the proofstrength line.
(3) Find the factor n0 of safety against jointseparation.
(4) Find the factor n of safety against yielding.

(question 4 for reference)

4. For the assembly similar to the one in Problem 3, thebolt of ½ in-13-UNC-2A grade 8 with rolled
threads is proloaded to 80% of its proof strength. There is astatic 1500-lb load applied to the
assembly to separate the joint. It is known that kb =1.2x106 lbf/in and km = 8.4x106 lbf/in
(1) Find the load factor nl.
(2) Find the factor of safety against static failure n.
(3) Find the factor of safety against joint separationn0.

Answer & Explanation Solved by verified expert
3.6 Ratings (293 Votes)
51 The stiffness constant of the joint is given byMinimum proof strength of grade 8 SAE bolts isTensile stress area of 12 in bolts isHence bolt preload    See Answer
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