Can anyone think of a way to identify which specific dimensions update when a drawing sheet or view is updated?
We've recently had issues where a change to a feature impacts other features that turn out to be dependent on that feature. It is impossible to determine what other features might...
After more research, I'm pretty sure fatigue thread stress concentration factors (Kf) are typically calculated and applied based on the average section stress (P/A). This just isn't made clear in Shigley and other sources. While stresses in the thread root are much higher, they apparently do...
Yup, I saw the 80 ksi value as well. But this is a static strength value, and I need to calculate fatigue life. Also, I can't make the 80 ksi value jive with the hand calc'd stresses in the thread root at the listed 1120 lbf load.
In my case, I've calculated preload section stresses(P/A) at...
rb1957- I used the SWT method as described in equation 7 of
http://www.ewp.rpi.edu/hartford/~ernesto/F2011/EP/MaterialsforStudents/Aiello/Dowling2004.pdf
The idea is to calculate an equivalent alternating stress cycle at R=-1.
Again, my questions are actually the following:
1) Which calculated...
Thanks for the replies. Just to be clear, I'm not necessarily looking for an answer from this forum as to how long the screw will last. I'm more interested in nailing down the methodology in terms of relating calculated stresses in the threads to an S/N curve.
I realize the limitations of...
I need to calculate Fatigue life for a fully threaded screw loaded purely in cyclic tension (preload + additional cyclic load). The screw is 300 series CRES, .164-32 UNC-2A. This is already designed, so I cannot change anything; I just have to report fatigue life. I would like to get some...
