Apparatus for studying the effects of rapid thermal cycles and high strain rates on the elevated temperature behavior of materials

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Abstract
A new research tool is described which permits determination of short‐time elevated temperature properties of metals and alloys. Test specimens are heated by their own resistance to the flow of a large magnitude heating current, and a rapid‐acting electronic‐proportioning rate‐control action permits achieving programmed heating of the specimen under test at rates up to and exceeding 3000°F./sec. with negligible thermal overshoot. Complete thermal cycles involving complex programs of alternate heating and cooling may be automatically programmed by means of a special electronic reference generator with a dynamic accuracy of ±15°F. for peak temperatures up to the working limit of existing thermocouple materials. The electronic programming device also initiates testing of the specimen in tension with any desired rate of crosshead motion up to 4.5 in./sec. with loads up to 10,000 lbs. Specimen temperature, load, and crosshead position as a function of time are automatically recorded by a direct—developing recording oscillograph. Examples of recent applications of the apparatus to some metallurgical problems are described briefly, and suggested areas of future application are summarized.

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