SEDL / STP / STP787-EB / STP28496S

Use of the Lognormal Distribution for Characterizing Composite Materials

Whitney, JM
Materials Research Engineer, Nonmetallic Materials Division, AFWAL Materials Laboratory, Wright-Patterson Air Force Base, Ohio

Pages: 15    Published: Jan 1982

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Abstract

In the characterization of composite materials the two-parameter lognormal distribution is shown to offer many practical advantages over the two-parameter Weibull distribution in terms of the availability of best unbiased estimators, ease of computing confidence bounds, and availability of best unbiased estimators for pooled data. The parameters of the lognormal distribution can also be put into a form which is analogous to the parameters of a Weibull distribution. Reasonable correlation to the lognormal distribution is obtained for static and fatigue data on graphite/epoxy composites.