著者

宮下 幸雄 武藤 睦治 長谷川 広尊

出版者

一般社団法人 溶接学会

雑誌

溶接学会全国大会講演概要

巻号頁・発行日

vol.2004, pp.501-501, 2004

著者

許 金泉 付 列東 武藤 睦治

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.68, no.672, pp.1266-1272, 2002-08-25 (Released:2008-02-21)

参考文献数

7

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The three dimensional theoretical solution of a normal concentrated forces on the free surface of a coating material is deduced by introducing the infinite mirror points of the load point and applying the Dirichlet's uniqueness theorem. The deduction is based on the basic equations of the spatial axisymmetric problems. It is found that all the stress functions corresponding to the mirror points, which satisfy the continuous conditions at the interface and the free boundary conditions at the free surface, can be deduced from the fundamental solution of a concentrated normal force on the free surface of a semi-infinite homogeneous solid. It is also found that only the stress functions corresponding to the first few mirror points have an influence on the accuracy of the theoretical solution. It is also found that the effect of material combination cannot be expressed by Dunders' parameters only. The stress field can be described by using Dunders' parameters together with the additional parameter.

著者

大木 基史 武藤 睦治 大原 稔 高橋 雅士 石橋 達弥

出版者

社団法人溶接学会

雑誌

溶接学会論文集 : quarterly journal of the Japan Welding Society (ISSN:02884771)

巻号頁・発行日

vol.16, no.3, pp.395-404, 1998-08-05

参考文献数

18

被引用文献数

8

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Two kinds of thermal cycle tests with short (10 min) and long (23h) holding times were carried out to investigate thermal cycling damage characteristics and thermal barrier property of thermal barrier coatings (TBCs). Surface cracks vertical to the coating surface were nucleated due to thermal stress during both the thermal cycle tests. Holding time had no significant influence on the surface cracking behavior. On the other hand, holding time had a significant influence on the thermal barrier property, which was degraded with increasing total holding time. The degradation of thermal barrier property was caused by the decrease in porosity and hence by the increase in density of ceramic layer.

著者

許 金泉 武藤 睦治 付 列東

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.68, no.672, pp.1259-1265, 2002-08-25

被引用文献数

1 7

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The theoretical solution of a concentrated force on the free surface of a coating material is deduced by introducing the infinite series mirror points of the load point and applying the Dirichlet's uniqueness theorem. In this study, the two dimensional solution is deduced in details by using the infinite series of the Goursat's stress function corresponding to every mirror point. It is found that the stress function corresponding to a higher order mirror point can be determined from that corresponding to a lower one, therefore, all the stress functions can be determined from that corresponding to the first order mirror point which is in fact the stress function for concentrated forces on the free surface of a semi-infinite body. It is also found that the contribution of the stress function to stress distribution decreases as the increasing of the corresponding order of the mirror point. It is confirmed that only the stress functions corresponding to the first several mirror points have an influence on the accuracy of theoretical solution. This theoretical solution can be expected to be very useful in evaluating the strength of coating materials or other surface modificated materials.

著者

水谷 淳之介 西田 友久 武藤 睦治 今岡 亮 牧野 真一 伊藤 六郎

出版者

一般社団法人 日本機械学会

雑誌

材料力学部門講演会講演論文集

巻号頁・発行日

vol.2006, pp.357-358, 2006

著者

水谷 淳之介 西田 友久 武藤 睦治 今岡 亮 牧野 真一 伊藤 六郎

出版者

一般社団法人 日本機械学会

雑誌

材料力学部門講演会講演論文集

巻号頁・発行日

vol.2006, pp.357-358, 2006

著者

宮下 幸雄 武藤 睦治 長谷川 広尊

出版者

社団法人溶接学会

雑誌

溶接学会全国大会講演概要

巻号頁・発行日

no.74, pp.74-75, 2004-03-21