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Title :ひずみ波形解析による疲労き裂発生の検出法
Title alternative :Method of Detecting Fatigue Crack Initiation through Analysis of Strain Waveform
Authors :真壁, 朝敏
西田, 新一
兼城, 英夫
玉城, 史郎
Authors alternative :Makabe, Chobin
Nishida, Shin-ichi
Kaneshiro, Hideo
Tamaki, Shiro
Issue Date :25-Jul-1992
Abstract :A method of detecting fatigue crack initiation in some weak section in an actual working machine is examined using a partially notched specimen. The waveform of the strain function composed of strains in the vicinity of the partial notch is successionally observed. It is found that such a strain waveform changes its shape at crack length 1mm due to the crack closure behavior. Therefore, in this experiment, the crack initiation can be detected at about crack length 1mm. Since the engineering crack initiation size is frequently taken to be 1mm, the present method for detection of crack initiation can be applied to actual machine equipment. Also, this waveform is analyzed with FFT. The power spectrum density of the waveform changes immediately after the crack length reaches 1mm. Furthermore, the shape of the coherence of two waveforms composed of same strains clearly varies at the same length, 1mm. Thus, the engineering size crack initiation is expected to be easily detected through the analysis of the strain waveform.
Type Local :雑誌掲載論文
ISSN :03875008
Publisher :日本機械学会
URI :http://hdl.handle.net/20.500.12000/225
Citation :日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A Vol.58 no.551 p.189 -196
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Engineering)

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