ISSN: 0090-3973
Page Count: 11

An Evaluation of Strain Measuring Devices for Ceramic Composites
Gyekenyesi, JZ
Full-Time Research Associate for Cleveland State University at NASA Lewis Research Center, OH

Bartolotta, PA
Senior Research Engineer, NASA Lewis Research Center, OH

(Received 2 August 1991; accepted 30 October 1991)

Abstract

A series of tensile tests were conducted on SiC RBSN composites using different methods of strain measurement. The tests were used to find the optimum strain sensing device for use with continuous fiber reinforced ceramic matrix composites in ambient and high temperature environments. Bonded resistance strain gages were found to offer excellent performance for room temperature tests. The clip-on gage offers the same performance but significantly less time is required for mounting it to the specimen. Low contact force extensometers track the strain with acceptable results at high specimen temperatures. Silicon carbide rods with knife edges are preferred. The edges must be kept sharp. The strain measuring devices should be mounted on the flat side of the specimen. This is in contrast to mounting on the rough thickness side.

Keywords:
ceramic matrix composites, tensile testing, high temperature, strain measurement, silicon carbide fibers, silicon nitride matrix

Paper ID: JTE11724J
DOI: 10.1520/JTE11724J
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