Abstract
Abstract The demand for materials suitable for operation under stress at high temperatures has made it necessary to investigate the properties of various alloys with regard to their resistance to creep. Various types of machines have been developed for this purpose. This paper describes the apparatus developed by the Union Carbide and Carbon Research Laboratories. Its principal features are a compound lever system of applying the load, similar to that used in regular tensile machines, and a simplified method of measuring the extension of the specimens. The compound lever system makes it possible to determine the load accurately and to use standard 0.505-in. diameter specimens without employing excessive weights, even at relatively low temperatures. The system used for measuring extension is such that the construction of the machine is simplified and the convenience of operation improved. The accuracy is ample for all creep tests except those in which extremely small creeps over long periods of time must be measured.
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