Posted by John G. Hasler on April 22, 2012 at 08:36:29 from (174.124.48.166):
In Reply to: Re: fine thread bolts posted by Janicholson on April 22, 2012 at 07:46:02:
> Which bolt would you trust more to hold your > bungy jumping anchor? The first is bolted > through a 6"X4" heavy walled tube in the 6" > direction and through a forged steel bracket > that pulled straight (axially) on it, tightened > (stretched)to 75% of yield. or one that was > identical and tightened to 5% of yield.
The first one, of course. The second is going to loosen up, fall off, and kill somebody. You can't do much worse than combine an under-torqued bolt with a cycling load.
(Yes, I realize that the tube will compress a bit. The engineer who designed the joint will have taken that into consideration. He will also have allowed a safety margin of at least 10.)
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