1225 ウェーブレット変換を用いた疲労破面特性化手法

概要

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A numerical analysis of a fracture surface is needed in the fractography. The method proposed in this paper quantitatively identifies the striation region observed in the fatigue fracture surface, and the striated surface ratio is calculated. The method proposed characterizes the striation region by using the wavelet transform, and the degree of striation is calculated from the wavelet coefficient. The Gabor function is applied as the mother wavelet function and it can be used to extract the striped pattern which is the feature of a striation. In order to evaluate the validity of the method, it is applied to the SEM picture of the fatigue fracture surface of A2017-T4 aluminium steel. Matching of the striation region calculated from the degree of striation and the result obtained from the human observation is performed. Consequently, good agreement between the judgment result by human observation and the judgment result by the method is obtained, and it is shown that the proposed degree of striation is appropriate to the evaluation of a striation region. Therefore, it becomes possible to evaluate a striation region using the method proposed, and it supports for the decision-making of an analyst who is unfamiliar with the fractography.
一般社団法人日本機械学会の論文
2003-09-23