RESEARCH PAPERS: Gas Turbines: Ceramics

A Technique to Achieve Uniform Stress Distribution in Compressive Creep Testing of Advanced Ceramics at High Temperatures

[+] Author and Article Information
K. C. Liu, C. O. Stevens, C. R. Brinkman

Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, TN 37831-6155

N. E. Holshauser

North Carolina A & T State University, Department of Mechanical Engineering, Greensboro, NC 27411

J. Eng. Gas Turbines Power 119(3), 500-505 (Jul 01, 1997) (6 pages) doi:10.1115/1.2817012 History: Received February 01, 1996; Online November 19, 2007


A technique to achieve stable and uniform uniaxial compression is offered for creep testing of advanced ceramic materials at elevated temperatures, using an innovative self-aligning load-train assembly. Excellent load-train alignment is attributed to the inherent ability of a unique hydraulic universal coupler to maintain self-aligning. Details of key elements, design concept, and principles of operation of the self-aligning coupler are described. A method of alignment verification using a strain-gaged specimen is then discussed. Results of verification tests indicate that bending below 1.5 percent is routinely achievable with the use of the load-train system. A successful compression creep test is demonstrated using a dumb-bell-shaped silicon nitride specimen tested at 1300°C for a period in excess of 4000 h.

Copyright © 1997 by The American Society of Mechanical Engineers
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