Tapped Thread Yield Limit
Tapped Thread Yield Limit
(OP)
Hi All,
I'm trying to calculate the yield strength of a tapped hole but I can't find it any where as the importance is on stripping/shearing the threads. Does anyone have any knowledge on it?
Any help is appreciated. Thanks
ZMalik2k8
I'm trying to calculate the yield strength of a tapped hole but I can't find it any where as the importance is on stripping/shearing the threads. Does anyone have any knowledge on it?
Any help is appreciated. Thanks
ZMalik2k8





RE: Tapped Thread Yield Limit
And for shearing, just divide by sqrt(3).
RE: Tapped Thread Yield Limit
Try this
http://www.engr.sjsu.edu/youssefi/me154/notes/Thre...
RE: Tapped Thread Yield Limit
RE: Tapped Thread Yield Limit
prod.sandia.gov/techlib/access-control.cgi/2008/080371.pdf
I haven't compared that section to anything yet to check it, but the other more basic bolt relations gave similar results to what I've previously used. Could be useful to you.
RE: Tapped Thread Yield Limit
I've had a scan through the above link and it mentions length of engagement to prevent thread stripping and factor of safety /margin of safety. I can't change the design but what I would like to find out is at how many newtons or torque would the internal/female threads yield at.
RE: Tapped Thread Yield Limit
http://www.boltscience.com/pages/Thread%20Strippin...
http://www.boltscience.com/pages/strength.htm
https://www.fastenal.com/content/feds/pdf/Article%...
http://www.ajaxfast.com.au/downloads/Technical%20n...
RE: Tapped Thread Yield Limit
Look on page 11 of the link I gave you and it gives a formula for internal thread stripping of nuts.
To calculate the thread stripping you need the yield stress of the aluminium in question, then divide that figure by 2.
Use the formula on page 11 and transpose it to give you the (P) value which is your load.
RE: Tapped Thread Yield Limit
Steel fastener? What grade?
How much relative thread engagement?
If I know the thread engagement I would compare it to one of the sources that rate such things. Strength approximately proportional to relative lengths.
pages 66-68 here by no less a source than SPS Unbrako
http://www.dalecompany.com/pdf/UNBRAKO.pdf
As to the clamping force (Tension) vs torque there have been many threads on that topic.