許 金泉 教授 特別講演会

日時: 2006年10月02日(月) 10:00〜
場所: 京都大学 工学部物理系校舎 2階 211会議室
講演者: 上海交通大学 教授 許 金泉(Jin-Quan XU)
講演題目: Interface debonding criterion for coating materials based on experiment and MD analysis (コーティング材料の界面剥離クライテリオンについての実験および分子動力学解析)
講演要旨:

To Characterize the interface strength of coating materials, critical interfaicial stresses corresponding to the critical scratch load are essential. From the analysis results of scratch tests under different stress conditions, it is found that the shear strength of the interface dramatically depends on the normal pressure. The larger the pressure is, the stronger the shear strength becomes. An empirical debonding criterion is proposed based on experimental and numerical results. Interestingly, such a criterion is similar to the well known Columb and Mohr's criterion for brittle materials under compression. However, it cannot be extended to normal tensile cases, under which an elliptical debonding criterion is developed by MD analysis. Thereby, to describe the strength behaviors of the interface in coating materials, three material properties are necessary.

Static failure and fatigue propagation properities of interface cracks in coating materials are also examined by experiments and numerical analysis in this study. It is found that the mode ratio has a strong effect on static failure, but almost no effect on its fatigue propagation.


京都大学大学院 工学研究科 機械理工学専攻 マイクロエンジニアリング専攻 航空宇宙工学専攻
情報学研究科 複雑系科学専攻
京都大学 国際融合創造センター
拠点リーダー 土屋和雄(工学研究科・航空宇宙工学専攻)
本拠点に関するお問合せは 拠点事務局 まで