Page 93 - Tribology in Machine Design
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Elements of contact mechanics 79
n 2
£ = 2.27x 10 N/m . The equivalent radius of contact is
Contact width, based on Hertz theory
Hertzian stress
Checking the Peclet number for each surface we get
We find that both Peclet numbers are greater than 10. Thus, using eqn
(3.9a)
and with equal bulk temperatures of 100 °C the maximum surface
temperature is
3.7.2. Refinement for unequal bulk temperatures
It has been assumed that the bulk temperature, T b, is the same for both
surfaces. If the two bodies have different bulk temperatures, T bl and T b2,
the T b in eqn (3.8) should be replaced with
If 0.2^n^5, to a good approximation,
