EHL film thickness in a point contact (direct load/speed)
Elastohydrodynamic film thickness, contact ellipse and pressure for a general elliptical point contact, from directly specified load and entrainment speed.
Central film thickness, hc0.15 µm
Mean contact pressure, pₘ1.27 GPa
Max contact pressure, pₘₐₓ1.9 GPa
Contact ellipse semi-axis a0.2 mm
Contact ellipse semi-axis b0.25 mm
Reduced modulus, E'230.8 GPa
Reduced radius, R4.29 mm
Dimensionless speed parameter9.42
Dimensionless load parameter1178.04
Dimensionless film parameter3.66
Method & references
- Hamrock-Dowson EHL film thickness regression for a general elliptical point contact.
The computation is a literal port of the original client-side JavaScript from /calculators/e12_5.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.