There
are many factors that impact the design of the wheel. As a baseline,
the
nominal mechanical requirements for the wheel are:
--
Ultimate Tensile Strength > 130 KSI
--
Yield Strength > 100 KSI
--
Elongation/Strain in 2" gage > 5%
--
Fracture Toughness >50 Ft. Lbs by Charpy Impact
--
Hardness > 300 Brinell Hardness
Critical
dimensional features in the wheel are --
--
Machined tolerances = ± 15 mils for center bore,
keyway, and rim OD
--
Overall as-cast tolerance = ± 30 mils
--
Surface finish requirement is 350 RMS with no visible
surface defects or grinding marks
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