ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 8

A Mechanical Extensometer for High-Temperature Tensile Testing of Ceramics

Liu, KC
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN

Ding, JL
Washington State University, Pullman, WA

(Received 17 August 1992; accepted 19 February 1993)

Abstract

Design and development of a simple mechanical strain extensometer for high-temperature tensile testing of ceramic materials are described. The extensometer uses the lever-arm concept to proportionally reproduce the displacements of fiducial gage marks defined on a specimen. Various potential errors in strain measurement associated with the kinematics of this mechanical extensometer are analyzed and estimated. The extensometer exhibits a resolution of 5 microstrain (μɛ) and good long-term stability under moderate changes of ambient temperature. Limited results of simple isothermal creep tests on silicon nitride tensile specimens are presented to demonstrate the effectiveness of the device.

Keywords:
extensometer, strain measurement, creep strain, tensile testing, high temperature

Paper ID: JTE11785J
DOI: 10.1520/JTE11785J
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