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STRESS CONCENTRATION UNDER A PIN

STRESS CONCENTRATION UNDER A PIN

STRESS CONCENTRATION UNDER A PIN

(OP)
I have a fatigue problem at a padeye originally used for installation subsea, now used for tether chains to a buoy. The shackle pin is smaller than the original installation shackle pin. The shackle pin bears on the upper inside surface of the padeye pinhole. The tether chain exerts a set of fatigue tension load ranges on the shackle. I have initially derived the SCF from the Hertz compression stress between the pin and the hole i/d and come up with 7.7, obviously this has given me a rather unattractive fatigue life! Any ideas?

RE: STRESS CONCENTRATION UNDER A PIN

Try Roark 6th edn. Art. 7.10 short span beams, compressive stress for short span beams, ratio over bending for l/d=1 is 6, so your number is probably in the ball park.

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