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determine axial strength of screwed joint

determine axial strength of screwed joint

determine axial strength of screwed joint

(OP)
Need to determine axial strength of screwed joint. Main member 36" diameter pipe with 1" thick wall, 4" diameter sch 80 nipple with 8 no. threads per inch, only  1/2" screwed into main member (self threaded into main ), carbon steel. What maximum tension can this joint sustain?

My solution : the shear strength of 1/2" section of nipple,
.3 x 35,000 (psi, fy for pipe) x (PI x 4.25 x 1/2)(in2, cylindrical contact area) = 70,000 lbs
Off course divide by say 2 for safety, allowable 35,000 lbs

Your comments will be appreciated   

RE: determine axial strength of screwed joint

I think I would apply a further reduction for the stress concentration factors, and lead angles of the threads.

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