Research on Measurement Technique for Lubricating Oil Film Thickness at Point Contact under Boundary Lubrication Conditions during Rolling Using Contact Resistance Method

YANG Jiahui; HUANG Lu; SUN Miao; ZHAO Pingtan; JIA Xin; CAI Jinhui; YE Fang

doi:10.3969/j.issn.1000-1158.2026.04.04

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Acta Metrologica Sinica ›› 2026, Vol. 47 ›› Issue (4) : 502-508. DOI: 10.3969/j.issn.1000-1158.2026.04.04

Research on Measurement Technique for Lubricating Oil Film Thickness at Point Contact under Boundary Lubrication Conditions during Rolling Using Contact Resistance Method

YANG Jiahui ¹^,² ,
HUANG Lu ² ,
SUN Miao ² ,
ZHAO Pingtan ² ,
JIA Xin ² ,
CAI Jinhui ¹ ,
YE Fang ¹

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Abstract

A precision rolling test module based on a ball-on-disk tribometer was developed to measure oil film thickness under boundary lubrication using the contact resistance method. The theoretical relationship between contact resistance and film thickness for point contact was derived from electrical contact and tribological theories， and its applicability under dynamic rolling conditions was experimentally validated. After calibrating the contact resistance under dry rolling to eliminate systematic errors， rolling lubrication tests were conducted under various loads and speeds to obtain dynamic contact resistance. The measured contact resistance was below 10 kΩ in boundary and mixed lubrication regimes， with a repeatability of 84 Ω. Oil film thickness was simultaneously measured using the optical interference method with a resolution of 0.8 nm. By correlating contact resistance with film thickness under identical operating conditions， a dynamic contact resistance-film thickness model for point-contact rolling under medium loads was established， achieving a goodness of fit of 0.96. The results demonstrate the feasibility of applying the contact resistance method to practical point-contact rolling lubrication conditions.

Key words

geometric measurement / boundary lubrication / point contact / rolling conditions / dynamic contact resistance-oil film thickness model

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YANG Jiahui , HUANG Lu , SUN Miao , et al . Research on Measurement Technique for Lubricating Oil Film Thickness at Point Contact under Boundary Lubrication Conditions during Rolling Using Contact Resistance Method[J]. Acta Metrologica Sinica. 2026, 47(4): 502-508 https://doi.org/10.3969/j.issn.1000-1158.2026.04.04

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