Fuzzy variable method for characterizing flaw sizes

Most of the discovery and measurement of the flaw sizes are using non-destructive testing (NDT) detection method. NDT detected flaw size with apparent randomness and fuzziness. This paper presents a fuzzy possibility distribution of flaw sizes based on the fuzzy theory of NDT and fuzzy variable method. This distribution is closer to the flaws’ real sizes and is more convenient to use, and can be used to cracks’ Monte Carlo simulation and other aspects of fracture mechanics analysis.