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By way of supplying a framework for the symposium papers it will be useful to describe some of the terms which will be used. Everyone knows what is meant by service performance, or adequacy in actual use. Testing, however, has many facets. Incidentally, since ASTM is a materials-oriented society, we are talking about testing involving materials adequacy—although there are, of course, other kinds of testing involved in assuring satisfactory service—noise, vibration, flow, etc. The various types of testing which relate to the symposium subject are shown in Table 1. By standard tests are meant the usual tension, impact, or other tests which are made in accordance with the prescribed procedures of standardizing organizations. Conventional tests are almost the same thing except that they have not reached the stage of an official standard, but are in wide usage and are generally accepted. The rotating beam (fatigue test) is an example of this kind. This first category of tests does not, by itself, usually provide adequate design information since actual machine or structural parts are not shaped or made in such an ideal way, nor are they loaded in a simple manner. However, for general checking of quality, for application to certain static cases, and for supplying a base for evaluation of various effects, these tests are useful.
Peterson, R. E.
chairman, Westinghouse Research Labs., Pittsburgh, Pa.