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Message: [QUOTE="TooManyToys, post: 1521487, member: 30841"] I worked in R&D my entire career and managed vehicle testing for 35 years, so I can go deep into a rabbit hole where there's no light. And doing that work for so long I've learned there's no absolute answer and hypothesis can be wrong, so don't take this as an absolute. There were a number of papers I've looked at, some restricted by SAE unless you are willing to pay, but this 20-year-old paper done for a masters degree I think brings home some interesting points. The illustrations work well for cliff notes rather than going through the entire 100 pages. [url]https://vtechworks.lib.vt.edu/bitstream/handle/10919/36656/etd.pdf?sequence=1[/url] His work is backed up by some other recent work. He touches on the Hertzian contact stress, but anyone can also go on a website to calculate the numbers and there are a number of them. An example, [url]https://www.amesweb.info/HertzianContact/HertzianContact.aspx[/url] I never gave much thought to the issue before now, but those pressures are up there. [ATTACH]50391._xfImport[/ATTACH] [/QUOTE]

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