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.
