FOURIER TRANSFORM METHOD FOR ANALYSIS OF FATIGUE FRACTOGRAPHS
YAN Yunhui; WANG Dejun;HUANG Yuhua; WANG Qinghao; WANG Tongbo (Northeastern University; Shenyang 110006)(Manuscript received 1996-05-20; in revised form 1996-07-04)
Cite this article:
YAN Yunhui; WANG Dejun;HUANG Yuhua; WANG Qinghao; WANG Tongbo (Northeastern University; Shenyang 110006)(Manuscript received 1996-05-20; in revised form 1996-07-04). FOURIER TRANSFORM METHOD FOR ANALYSIS OF FATIGUE FRACTOGRAPHS. Acta Metall Sin, 1997, 33(4): 386-390.
Abstract 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.
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