Paper 1: The Measurement of High-Speed Unlubricated Metallic Friction

Abstract
There exists a likelihood of using, sometime in the near future, metals sliding together in a normal atmosphere at speeds above those normally encountered in engineering mechanisms today. This has led to the desirability of obtaining information about the properties of such materials under extreme conditions of sliding. In this paper a survey is made of the experimental techniques and apparatus used by previous investigators working in this subject. The advantages and disadvantages of the different approaches adopted by them are discussed, and the reasons for the construction of a pin and disc type of apparatus, of the size described, are outlined. The procedure adopted, for designing a suitable machine for use in the laboratory, capable of yielding the desired information under controlled experimental conditions, is outlined. The requirements of the necessary instrumentation are followed by details of the systems finally used. The apparatus finally developed is fully described and details are given of the experiments conducted. A typical set of results are discussed and the experimental errors assessed.

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