Cyclic Fatigue Experiments and Analysis of Silicon Nitrides—Stepwise Loading

[+] Author and Article Information
Y. P. Chiu

Torrington Company, Torrington, CT 06790-1008

J. Eng. Mater. Technol 120(4), 275-279 (Oct 01, 1998) (5 pages) doi:10.1115/1.2807012 History: Received October 30, 1997; Revised February 23, 1998; Online November 27, 2007


Rotating beam fatigue test has been performed at room temperature for two types of advanced hot-pressed silicon nitrides. The test completion modes consist of fast fracture, fatigue fracture, and runout (at about 108 cycles). Some specimens tested have been subjected to step-up load testing. Application of Weibull statistical method has been made as the fatigue lives of specimens under a constant bending load are subjected to wide scatter. A maximum likelihood analysis was applied to test data obtained from the single load and step-up load tests to determine the fatigue (or crack growth) exponent. The effect of specimen surface finish on fast and fatigue fracture has also been investigated using the Weibull analysis.

Copyright © 1998 by The American Society of Mechanical Engineers
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