Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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An Evaluation of the Hamrock and Dowson's EHL Film Thickness Formulas

Hamrock과 Dowson의 EHL 유막두께식에 대한 평가

  • Published : 1996.09.01
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Abstract

In this paper, a finite difference method and the Newton-Raphson method are used to evaluate the Hamrock and Dowson's EHL film thickness formulas in elliptical contact problems. The minimum and central film thicknesses are compared with the Hamrock and Dowson's numerical results for various dimensionless parameters and with their film thickness formulas. The results of present analysis are more accurate and physically reasonable. The minimum film thickness formula is similar with the Hamrock and Dowson's results, however, the central film thickness formula shows large differences. Therefore, the Hamrock and Dowson's central film thickness formula should be replaced by following equation. $H_{c} = 4.88U^{0.68}G^{0.44}W^{0.096}(1-0.58e^{-0.60k})$ More accurate film thickness formula for general elliptical contact problems can be expected using present numerical methods and further research should be required.

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References

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  8. Proc. R. Soc. Lond. A v.387 A Theoretical Analysis of the Isothermal Elastohydrodynamic Lubrication of Concentrated Contacts Chittenden, R.J.;Dowson, D.;Dunn, J.F.;Taylor, C.M.
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  10. WEAR v.136 A Numerical Analysis of the Elstohydrodynmic Lubrication of Elliptical Contacts Park, T.J.;Kim, K.W.
  11. Ph.D. Thesis, KAIST A Numerical Analysis of the 3-Dimensional Elastohydrodynamic Lubrication Problem Park, T.J.

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  1. 타원접촉의 탄성유체윤활 : 제2보 - 스핀운동의 영향 vol.23, pp.2, 1996, https://doi.org/10.9725/kstle.2007.23.2.049
  2. 구름/스핀 운동을 하는 경우의 타원접촉 EHL 유막두께 vol.24, pp.6, 1996, https://doi.org/10.9725/kstle.2008.24.6.355