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薄片化した α-アルミナの応力拡大係数と亀裂進展挙動

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Title: 薄片化した α-アルミナの応力拡大係数と亀裂進展挙動
Other Titles: Stress Intensity Factor and Crack Propagation Behavior of Thin α-Alumina
Authors: 松尾, 孟1 Browse this author
海江田, 裕介2 Browse this author
児嶋, 伸浩3 Browse this author
池田, 賢一4 Browse this author →KAKEN DB
波多, 聰5 Browse this author
中島, 英治6 Browse this author
Authors(alt): Matsuo, Hajime1
Kaieda, Yusuke2
Kojima, Nobuhiro3
Ikeda, Ken-ichi4
Hata, Satoshi5
Nakashima, Hideharu6
Keywords: thin ceramics
polycrystalline alumina
stress intensity factor
transgranular fracture rate
crack deflection rate
Issue Date: Jan-2010
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 74
Issue: 1
Start Page: 24
End Page: 29
Publisher DOI: 10.2320/jinstmet.74.24
Abstract: This paper reports the mechanical property and crack propagation behavior of thin ceramics. A method to evaluate the stress intensity factor, KI, of thin ceramics was proposed. Dependence of KI values on the average grain size, d, of thin α-alumina were measured by the method. KI values of thin α-alumina decreased with increasing d values from 4.3 μm to 15.2 μm, while the KI values were almost constant for 15.2 μm≤d≤63.0 μm. The trend of KI values agreed with the dependence of fracture toughness, Kc, of bulk α-alumina. The thin α-alumina specimens after crack propagation were investigated by scanning electron microscopic electron back-scattered diffraction (SEM/EBSD) analysis. Branched cracks were hardly observed, regardless of grain size. The result indicates that the toughing mechanism do not occur in the thin α-alumina. Dependence of the transgranular fracture rate, F, and the crack deflection rate, D, on d were measured from the orientation distribution maps. However, the F values and the D values were independent of d and approximately constant. The F values and D values depend on d in bulk α-alumina. It indicates that the crack propagation behavior is varied by thinning α-alumina.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 池田 賢一

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