Reliability Assessment of Aircraft Structures Based on Probabilistic Interpretation of the Scatter Factor
Final rept. 1 Sep 1973-1 Mar 1975
FREUDENTHAL (ALFRED M) CHEVY CHASE MD
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The scatter factor S as used in fatigue design of aircraft is defined as the ratio between the location parameter estimate of the population of all aircraft, obtained from n full-scale tests, and the first failure in a fleet of m aircraft. Introducing the Third Asymptotic distribution of smallest values for the fatigue life of the population, this definition produces a Pareto-type distribution of the scatter-factor, on the basis of which S can be related to the numbers n and m and the reliability level R. Tables of S for different combinations of n, m, R and the minimium fatigue life are evaluated. Useful values of the scatter factor for different materials and purposes are suggested.