Stress concentration in a chamfer (rather than a fillet) of an axially
Stress concentration in a chamfer (rather than a fillet) of an axially
(OP)
Hello, I have a rod of two different diameters and I'm trying to find the stress concentration at the chamfer between the two diameters. I understand how to find the stress concentration factor, K, if the joint was a fillet (using r/d and D/d to find K in the appropriate table). However I can't find any way of getting K for a chamfered joint. Please help point me in some direction. Thanks so much. I've attached a quick diagram showing the filleted and chamfered versions of the shaft. The chamfered one is the actual piece I'm trying to find K for.





RE: Stress concentration in a chamfer (rather than a fillet) of an axially
I am unabe to find a stress concentration factor for your fillet.
I would use the radius value where the two diameters intersect which you can make extremely small and use this calculator:-
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Even at the intersection of the diameters you will not get a perfectly square shoulder, there will be a very small radius ie:- same radius as the tip of the cutting tool.
desertfox
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
I found this article:-
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It states a shaft with square corners as 60% strength of the smallest diameter.
desertfox
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
Always remember, free advice is worth exactly what you pay for it!
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
Unfortunately colnel, I don't have access to the Petersen's book.
I appreciate the input though, if anything else pops up, let me know. Thanks.
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
your welcome
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
http:/
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
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This way you will have the best information available without having to worry about it's correctness. If its for an important company project you boss may even pay for it.
Always remember, free advice is worth exactly what you pay for it!
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
Matter-o-fact, seeing as you have such a sharp taper, you may want to estimate the stress as a stepped shaft with a radius at the root (case 1 in your diagram). In that way, you can use the standard formula to estimate the stress concentration in the root of the fillet. Your answer should be a bit conservative, but pretty darn close.
If the radius at the root isn't currently defined, it should be. An uncontrolled inside radius is bad news. Strictly speaking, you could be building a crack into your design. So, step 1 would be to define it.
RE: Stress concentration in a chamfer (rather than a fillet) of an axially
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