Abstract
A high‐temperature hoop stress measurement apparatus has been developed for ring specimens of CVD tungsten or other refractory metal alloys. This apparatus has the advantage of being adaptable for high‐temperature tensile testing. Force is applied to a tapered cone which transmits force to eight equal segments which press uniformly on the inner surface of the ring specimen. The specimen is heated by induction in either vacuum or a protective atmosphere. Equations are developed for stress and strain from hoop stress parameters. Room temperature hoop and tensile tests on aluminum, copper, and brass specimens were compared to ascertain the role of friction in the hoop stress tests. For temperatures up to 1400°C, the effective friction coefficient, µ, of the hoop testing apparatus was determined using CVD tungsten in a similar manner. Design details and the results of the elevated temperature tests on CVD tungsten are discussed.
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