Abstract
Methods for determination of the crack opening stress intensity factor (Kop) and for estimation of the effective stress intensity factor range (ΔKeff) are evaluated for crack growth test data of aluminum alloys. Three methods of determining Kop, visual measurement, ASTM offset compliance method, and the neural network method proposed by Kang and Song, and three methods of estimating ΔKeff, conventional, the 2/P10 and 2/PI methods proposed by Donald and Paris, are compared in a quantitative manner by using evaluation criteria. For all Kop determination methods discussed, the 2/PI method of estimating ΔKeff provides good results. The neural network method of determining Kop provides good correlation of crack growth data. It is recommended to use 2/PI estimation with the neural Kop determination method. The ASTM offset method used in conjunction with 2/PI estimation shows a possibility of successful application. It is desired to improve the ASTM method.
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