Published: Jan 1937
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In spite of the fact that wear is a dominant, or important secondary, factor in the majority of applications of metals, and has been long recognized as one of the important elements in deterioration and mechanical inefficiency, relatively little is actually known about the phenomenon. The qualitative effects of some of the more obvious controlling factors affecting wear are recognized, but it is certain that other important but obscure and unidentified factors are also effective. The choice of suitable experimental criteria for selecting the best material for a given wear-resisting application is thus a problem of no little difficulty. Its practical solution generally includes the use of laboratory wear tests for separating the worse from the better of the available materials and subjecting the latter to trial in actual service. This paper is based upon some experiences gained in the course of a program, the objects of which were (1) the identification and quantitative study of the controlling variables in wear, (2) the utilization of this information for the development of a laboratory test which would disclose the general level of wear resistance and the typical wear characteristics of different cast irons; the present paper is concerned, primarily, with the first of these objectives. An exploratory program indicated the desirability of a continuous test, in so far as the attainment and maintenance of constant test conditions was concerned, yet the necessity to determine the weight loss — time behavior required the test to be interrupted periodically. It therefore seemed desirable to devise a technique in which a series of runs of short duration would approximate a continuous, long-time test. While this point of view may be said to possess a certain degree of artificiality, the existing status of wear testing seemed to require such an approach.
Ackerman, D. E.
MetallurgistProfessor of Metallurgy, The International Nickel Co., Inc.Purdue University, BaronneLafayette, N. J.Ind.