FOURIER TRANSFORM METHOD FOR ANALYSIS OF FATIGUE FRACTOGRAPHS
疲劳断口分析的Fourier变换方法

The quantitative analysis for fatigue fractography can be realized through the suitable image transform of fatigue fractographs, from which some useful characteristics can be obtained. Two-dimensional discrete Fourier transform is used in the process of fatigue fractograph, and the important characteristics to describe the texture and direction features on a fatigue fracture surface are abstracted from the Fourier power spectrum. A two-dimensional image analysis problem can be simplified as a one-dimensional characteristic curve analysis. The results show that some important characteristics on a fatigue fracture surface can be obtained in space frequency domain by means of two-dimensional discrete Fourier transform, which are impossibly acquired in space domain of fractograph. The method presented in this paper is identified to be a new way to carry out quantitative analysis of fatigue fractography.