Surface Temperatures in Sliding Contact

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Abstract
A study was made of the surface temperatures generated by friction in a sliding system—a fixed constantan ball riding on a rotating steel cylinder. Using the principle of the Herbert-Gottwein dynamic thermocouple, time-average as well as instantaneous surface temperatures were determined. Some measurements were also made with imbedded thermocouples, and advantages and limitations of both methods are discussed. It was found that the average surface temperature was quite independent of running time and gross wear but increased markedly with increasing speed or load. Under the conditions used in this study (60–250-gm loads and 14–224 cm per second sliding velocities), average surface temperatures ranging from 87 to 239 F were obtained. It is shown that ΔTm = KQn, where ΔTm is the average rise in surface temperature, Q is the total rate of frictional heat supplied, n is approximately equal to 1/2, and K is a proportionality constant. The corresponding maximum surface temperatures reached in these experiments ranged from approximately 170 to 610 F. The experimental results are considerably lower than those predicted theoretically from the work of Blok, Jaeger, and Archard. Possible reasons for this difference are discussed.

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