I am wondering if there is a relationship between friction and Hertz contact pressure defined somewhere. I just can't seem to find it. I could use FE to determine this, but didn't want to waste time if its already been done.
rb1957, I mean CoF, i.e. One thing I do know is that the surface and sub surface contact stress becomes very important when the CoF is above 0.3. I wondered if anyone knew more about this.
I will also go through your suggestions on literature.
rb1957 is correct that the CoF is supposedly independent of the normal force...that's assuming no deformation of either surface due to the normal force....an assumption that doesn't necessarily hold in practice.