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RESEARCH PAPERS: Reliability, Stress Analysis, and Failure Prevention

Statistical Analysis of Fatigue Failure Due to Flow Noise Excitations

[+] Author and Article Information
H. Fenech, A. K. Rao

Department of Chemical and Nuclear Engineering, University of California, Santa Barbara, CA 93106

J. Vib., Acoust., Stress, and Reliab 108(3), 249-254 (Jul 01, 1986) (6 pages) doi:10.1115/1.3269335 History: Received January 30, 1986; Online November 23, 2009

Abstract

The power spectrum of the stress induced by a narrow-band (vortex shedding) and broad-band (impingement, near field) flow noise on a simply supported square plate is used to determine the fatigue failure probability of that plate. A lognormal distribution of the material properties and a Rayleigh distribution of the stress peaks are implied in the statistical model. The Poisson failure rate and reliability are computed for several crack propagation factors and statistical distributions of the initial strength of materials. The plate fatigue lifetime obtained by statistical analysis is generally shorter than the one given by a deterministic Palmgren-Miner cumulative model for narrowband and broad-band excitations. The two models predict similar fatigue lifetime for cases corresponding to small initial material cracks or low rates of crack propagation.

Copyright © 1986 by ASME
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