The correlation between surface temperature and the number of metallic contacts in the concentrated contact

Results of measurements of local changes in electrical resistance in a concentrated contact and contact surface temperatures determined with the aid of a thin-layer transducer are presented in this paper.Good agreement between the oil film thickness corresponding to the measured inlet temperature and the thickness predicted by the thermal reduction factor given by Murch and Wilson has been found. It has also been found that there exists a strong correlation between the number of individual metallic contacts (asperities) in the contact zone and the surface temperature in the inlet zone as well as the maximum surface temperature in the contact. This dependence may be described by a power function for which the exponent depends only on rolling velocity; however, the coefficient is also a function of sliding velocity.