Comparison of Weibull Strength Parameters from Flexure and Spin Tests of Brittle Materials

[+] Author and Article Information
F. A. Holland, E. V. Zaretsky

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135

J. Mech. Des 116(4), 973-979 (Dec 01, 1994) (7 pages) doi:10.1115/1.2919507 History: Received March 01, 1992; Revised July 01, 1993; Online June 02, 2008


Fracture data from five series of four-point bend tests of beams and spin tests of flat annular disks were reanalyzed. Silicon nitride and graphite were the test materials. The experimental fracture strengths of the disks were compared with the predicted strengths based on both volume flaw and surface flaw analyses of four-point bend data. Surface flaw analyses resulted in good correlation with experimental results in those test series where all tested specimens were obtained from the same material batch. The Weibull slopes (moduli) and characteristic gage strengths for the disks and beams were also compared. Differences in the experimental Weibull slopes were not statistically significant. It was shown that results from the beam tests can predict the fracture strength of rotating disks under well controlled conditions.

Copyright © 1994 by The American Society of Mechanical Engineers
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