Shot peening - transition to "deep surface rolling"

[Tmoose]

We are re-engineering an improved version of a Ø 12" steel shaft. It is part of an assembly with an interference fitted hub that likely causes fretting in a region of maximum reverse bending and fairly constant torsional stress.
As usual, the details of the true history of fracture failure of these shafts is hard to dredge up.

I am confident well done shot peening will help, but am thinking a rolling process could induce even deeper compressive stress, which could be even better . Standards abound for Shotpeening intensity, methods , process control, and so on. It probably helps that I've been working with shotpeening for a few score years.

==============.

Information on surface rolling as a process is proving much harder to come by.

My question - Does anyone know of any technical info that might help quantify a rolling process for these shafts?

thsnks,

Dan T

 

[MintJulep]

Maybe search for anything that the railroad axle manufacturing community has done. Similar in regard to reverse bending, torsion load and press fit components.

As a starting point.

https://railways.danobatgroup.com/en/rolling-machine

 

[rb1957]

I think the trouble you'll find is in the surface finish.

fretting in an interference fit joint means the interference is degrading. why? How?
I think you need to know the answers to these questions before designing an improvement.

another day in paradise, or is paradise one day closer ?