Dan Timberlake wrote:the Hertzian stresses when curved surfaces are forced together (as in rolling element bearings or gear teeth) are highest just below the surface. I think This spells trouble for any plating or coating applied to a hard working roller bearing or gear, since the bond strength of the coating to the substrate will be severely tested, and is likely not more than a few thousand psi.
I wonder if there is an isostatic pressure means of uniformly (and economically?) compressing a circular outer surface to overyield so as to have the surface work continuously in resisting subsequent loading. Shot peening is incremental rather than continuous, for example. Perhaps the compression of a kernel in some types of devices is an example.
When gun barrel bores are pushed to overyield is the outer cylinder surface constrained and also in overyield?