A diametral extensometer for elevated temperature high strain fatigue

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Abstract
A diametral extensometer for elevated temperature use up to 850°C is described, primarily for use with a previously described integral grip-heater system for low cycle fatigue, but of fairly general applicability of principle. The extensometer comprises a measuring assembly using electronic displacement transducers adjustably mounted in a quartz frame and capable of resolving diameter changes of 10−5 in; a position compensating device maintains the measuring assembly in the selected plane of measurement during deformation of the specimen. The extensometer is suitable for use with both parallel and continuously radiused specimens. The electrical output proportional to specimen strain enables the device to form part of automatic cycle controlling circuitry.

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