In this case we are talking notch relief groove related to tensile or compression in steel components, axisymmetric components, where the force acts in an axial direction.
You may want to look at Peterson's Stress Consentration Factors.
Wes C.
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I don't have that book, but does it tell you how to get rid of the stress concentrations? I know where the problem lies, but not how to optimize my design...
I use 1/32 inch on diameter, box X pin. I then round to the nearest 1/64 inch fractional diameter. Typically these are 1/4 inch wide, maybe 3/8 inch on the back of the box.
For example, 1.000 - 8 Stub Acme-2G would exhibit a thread relief of 0.859 dia X 1/4 inch long on the Pin, and 1.062 inch X 1/4 inch long on the front of the Box (i.e. counter bore) and 1.062 inch X 3/8 inch at the back.
I like to break these reliefs with a 45 degree angle in all cases.
Note that you would apply the 1/32 inch over diameter relief to tyhe miniminm minor diameter on the Pin, maximum major diameter on the Box. I have a threading program which determines this for me, good for Acme, Stub Acme and UN (coarse, fine, extra fine & special). This saves me time in recomputing the proper threading geometry.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
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