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Fatigue Strength as a Function of Preloading in Dynamic Fatigue Testing of Glass and Ceramics FREE

[+] Author Affiliations
Sung R. Choi

Cleveland State University, Cleveland, OH

Jonathan A. Salem, John P. Gyekenyesi

NASA Lewis Research Center, Cleveland, OH

Paper No. 96-GT-342, pp. V005T13A019; 10 pages
doi:10.1115/96-GT-342
From:
  • ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General
  • Birmingham, UK, June 10–13, 1996
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7876-7
  • Copyright © 1996 by ASME

abstract

The solution of fatigue strength as a function of preloading in dynamic fatigue testing was obtained analytically and numerically. The effect of preloading on dynamic fatigue strength decreases with increasing fatigue parameter (n), and for n ≥ 20 the effect is negligible up to a preloading of 90 %. The solution was verified by dynamic fatigue experiments conducted with soda-lime glass and alumina specimens in room-temperature distilled water. This result showed that one can apply a preloading corresponding up to 90 % of fatigue strength for most glass and ceramic materials, resulting in a dramatic saving of testing time in dynamic fatigue testing. The key feature that makes this technique feasible is that most of the slow crack growth under dynamic fatigue loading occurs close to failure time where a dynamic fatigue strength is defined.

Copyright © 1996 by ASME
This article is only available in the PDF format.

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