Pa

For a sphere on a flat surface of the same material maximum compressive stress, or = -0.621

IPE2 4 R2

For a sphere in a spherical seat of the same material

maximum compressive stress, ac = —0.62\\PE2

For spur gears maximum contact stress, ac

Fwd m with W = tangential driving load; Fw = face width; d = pinion pitch diameter; m = ratio of gear teeth to pinion teeth.

For helical gears maximum contact stress, ac = —C

mp where mp is the profile contact ratio and C a constant, both given in Table 10.2.

maximum stress, crmax

Elastic stress concentration factor K, = Fatigue stress concentration factor Kf =

nominal stress, <xnom S„ for the unnotched material

S„ for notched material with S„ the endurance limit for n cycles of load.

or, in terms of a significant linear dimension (e.g. fillet radius) R and a material constant a

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