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Title :疲労き裂伝ぱ過程における過大荷重負荷履歴の検知手法
Title alternative :A Detection Method of Overloading History during Fatigue Crack Propagation Stage
Authors :真壁, 朝敏
末吉, 敏恭
Purnowidodo, Anindito
宇都宮, 登雄
Authors alternative :Makabe, Chobin
Sueyoshi, Toshiyasu
Purnowidodo, Anindito
Utsunomiya, Takao
Issue Date :25-Mar-2003
Abstract :In the present study a detection method of an overload application during stress cycles under constant amplitude was investigated. Also, the effect of a tensile overload was shown at three stress ratios: R = 0, -1.5, in order to understand the effects of R on crack propagation after an overload. At a baseline of R = 0, after an overload retardation in the crack propagation was observed. However, in the case of R = -1.5, the fatigue crack growth rate actually accelerated after a tensile overload. That behavior of crack propagation was tried to be detected by the information of strain waveform h; h = ε_y + 1.2λε_x, where, ε_y and ε_x are the local strains at the specimen axis, and λ is the strain range ratio Δε_y/Δε_x. The waveform shape of h was changed after the overloading. Also, the application of an overload can be detected by the variation of the strain range ratio λ. Specially, the present method is useful for cases of the crack propagation stage under negative R conditions.
Type Local :雑誌掲載論文
ISSN :03875008
Publisher :日本機械学会
URI :http://hdl.handle.net/20.500.12000/130
Citation :日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A Vol.69 no.679 p.140 -146
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Engineering)

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