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F1BADUDE F1BADUDE is offline
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Join Date: Aug 2002
Posts: 73
I've done a few accidental torque to failure tests at work using an extreemly accurate $20K nut runner. Generally after we accidently run the torque using the wrong program ( like running an M8 class 9 nut nut using an M12 class 10 program) we will graph out the failure. Although it varies quite a bit from joint to joint you can generally tell that the stud will start to yeild at over twice the recomended torque. The graph will look like an EKG of a heart attach at just under twice the recommended torque and then will drop off pretty rapidly until ultimate failure.
You'll think, OH S%^T when it starts to creek (that's the heart attach) Worse part is, this is usually about a $250 oops on a prototype mechanism!
Old 09-24-2004, 05:39 PM
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