Abstract
A simple crack growth rate-based statistical model for fatigue crack propagation in fastener holes under spectrum loadings is proposed and investigated. A method for analyzing the crack growth rate data in order to calibrate the model parameters is presented. Emphasis is placed upon crack propagation in the small crack size region where the statistical dispersion is very significant. The statistical distributions of both the crack size at any service time instant and the crack propagation life to reach any specific crack size are derived analytically. Available fractographic data for 7475-T7351 aluminum fastener hole specimens under B-l bomber loading spectra have been analyzed statistically. It is demonstrated that the correlation between the statistical model and the fractographic results is very reasonable.
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