RESEARCH PAPERS: Gas Turbines: Vehicular

Predictions of Tensile Behavior and Strengths of a Si3N4 Ceramic at High Temperatures Based on a Viscoplastic Model

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

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

J.-L. Ding, S.-B. Lin

Department of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164

J. Eng. Gas Turbines Power 119(1), 200-204 (Jan 01, 1997) (5 pages) doi:10.1115/1.2815549 History: Received February 22, 1995; Online November 19, 2007


Tensile deformation and rupture behavior were simulated using a viscoplastic model developed recently. The model was formulated based on the state variable approach, which provides flexibility and versatility for characterizing the time-dependent behavior of ceramic materials under general thermomechanical loading conditions. Simulations portrayed by the model were compared with experimental tensile data obtained under two different tensile stressing rates. Results showed that the model was capable of simulating deformation behavior for all practical engineering purposes, but estimated high-temperature fracture strengths somewhat conservatively.

Copyright © 1997 by The American Society of Mechanical Engineers
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