The thread connection's root fillet radius of 0.038$ size is the greatest weakness of the API NC type joints and thread. During the slimehole drilling, especially in the deep and ultra-deep gas well, ...
A few guidelines show how to correctly use FEA stresses to find reasonable margins of safety. Although finite-element analysis has become an indispensable part of engineering, a few users knock it ...
FEA reveals shoulder fillets under unanticipated stress. "How linear FEA helps in fatigue analysis," Machine Design, Jan. 6, 2005, discusses how to get the right margin of safety out of FEA. Darrell ...
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