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Wheel loading for underhung crane as per CMAA 74

Wheel loading for underhung crane as per CMAA 74

Wheel loading for underhung crane as per CMAA 74

(OP)
I'm in the engineering department of a crane manufacturer. CMAA 74 (2010) section 4.7.2 has spec's. for crane wheels. Table 4.7.2.3-1 gives allowable loads based on wheel dia., wheel tread type, etc., all based on wheel hardness of Brinell 200. A "simple formula" is mentioned on which the table is based, but the formula is not given. I have an application for 4" dia. wheels of copper alloy C86200, Brinell 180. I checked an old Whiting Crane Handbook but couldn't find any formula including wheel hardness.  Can anyone direct me to a formula?

RE: Wheel loading for underhung crane as per CMAA 74

Bsmet95:

It's basically a Hertz bearing stress problem.  Look in any good Advanced Strength of Materials or Theory of Elasticity text to get started.  The bearing stresses are a function of the diameter, tread shape, Fy, and hardness of the wheel; and the same properties for the rail or beam flg. mat'l.  Then there is also a whole bunch of history and experience factored in there too.
 

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