From the information that I see, the geometry is more like a typical bolt/nut arrangement with cut threads and no preload.
To obtain a life estimate of typical bolt/nut arrangement and cut threads you can refer to the following ESDU papers where the life is evaluated as a function of the...
I am also involved with parts where the properties and dimensions of the thread are of importance. For me the dimensions of the threaded joint are not standard like they are in a typical bolt/nut arrangement. I used ANSYS software with axis-symetric element and with contact elements for the...
TVP & Unclesyd,
I have access to MIL-HDBK-5 at work, I will look into it. I just received STP 1391 (good data on fastener fatigue) and some papers from STP 1236. I used as reference the ESDU Papers 84037 ‘‘Fatigue strength of external and internal steel screw threads under axial loading.’’ and...
TVP,
The principal materials that I used are:
Steel AISI 17-22A heat treated for a hardness 35-40 HRC,
Steel AISI 4340 heat treated for a hardness 40-45 HRC and
Nickel Inconel 718 solutioned and precipitation hardened for UTS= 180 ksi.
Regarding the low or high cycle fatigue, different...
Thanks to both of you for the feedback.
I visited the site www.fatiguecalculator.com that I found interesting. The approach I normally used to evaluate the Low Cycle Life of mechanical components (shaft, housing, etc.) is very similar to the stress-life method of the fatigue_calculator.
I...
I am actually involved with fatigue of threaded hollow shaft used to tie a stack of rotating components. I am looking for information on how to establish the LCF life of the threads. The approach based on the ratio of nominal stress / ultimate strength (frequently used for fasteners) is not...
