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Title :き裂開閉口挙動に基づく穴材の疲労き裂発生の検出法について
Title alternative :A Study of a Method of Detecting for Fatique Crack Initiation in a Holed Specimen Based on Crack Tip Opening and Closing
Authors :真壁, 朝敏
兼城, 英夫
Authors alternative :Makabe, Chobin
Kaneshiro, Hideo
Issue Date :25-Nov-1990
Abstract :A simple and new method of detecting for crack initiation at a notched section of a moving machine element is proposed and applied to a specimen with a blind hole. In this experimental case, the fatigue crack tip opening and closing point can be measured using the relation between the following function h and cyclic stress σ:h=ε_y+λε_x, λ=Δε_y/Δε_x, where ε_y and ε_x are the strains measured in the vicinity of the edge of the hole in the center axis, and Δε_y and Δε_x are the ranges of ε_y and ε_x, respectively. Crack initiation at the hole edge can also be detected with the waveform of such a function h. Furthermore, until the crack reaches the hole bottom, the crack length can be evaluated with the range of the subtractive function related to h. The detective method proposed can be expected to be applicable to the monitoring of crack growth in many real cases.
Type Local :雑誌掲載論文
ISSN :03875008
Publisher :日本機械学会
URI :http://hdl.handle.net/20.500.12000/222
Citation :日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A Vol.56 no.531 p.19 -24
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Engineering)

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