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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1982, Vol. 3 ›› Issue (4): 21-27.
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Lin Fujia, Huang Yushan
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Abstract: The reliability prediction and damage tolerance analysis of aircraft struc-ures based on the principles of fracture mechanics require the knowledge of the ability of flaw detection. A statistical method for determining the flaw detection probability curve is developed and a test technique for obtaining independent flaw detection data is described in this paper. Based on these data and a formula proposed in this paper, the confidence lower limit of the flaw detection probability with the given confidence level for an arbitrary size of a sample and for an arbitrary value of the detection probability can be calculated merely with the help of the table of F-distribution. The presented formula occurs exact and simple in comparison with other approximate formulas proposed by some authors.As an example, the flaw detection probability curve with 95% confidence is given, which comes from the results of inspecting corner flaws at holes in 50 specimens. The specimens were made of steel 45 and the magnetic-particle technique was applied for non-distructive inspection.Finally, the simplified method for determining the flaw detection probability curve is also discussed.
Lin Fujia;Huang Yushan. STATISTICAL DETERMINATION OF A FLAW DETECTION PROBABILITY CURVE[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1982, 3(4): 21-27.
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