著者

及川 昌志 南田 勝宏 久米原 宏之

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌論文集 (ISSN:13488724)

巻号頁・発行日

vol.72, no.12, pp.1515-1519, 2006-12-05 (Released:2012-01-13)

参考文献数

9

被引用文献数

1 1

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Manufacturing technology for stainless steel double skin panels using laser spot welding was developed and some static strength properties were carried out. And this panel has been examined for the feasibility of practical utilization. The results obtained are summarized as follows;(1) Manufacturing technology was established on which there are invisible welding marks and the corrosion resistance and appearance are equivalent to original metal surface.(2) Calculate method of the moment of inertia of area of this panel is established.(3) This panel is approximately 75% lighter than the bulk material in equivalent flexural rigidity.(4) Any laser spot welded site is not broken in region of below maximum load as well as localized buckling in mechanical tests.(5) In application of this panel to vessels and vehicles, simulation model of stiffness and strength of this structures life prediction of this panel based on fatigue strength analysis for panel reliability prediction technology is required.

著者

久米原 宏之 丸山 一男 津田 米雄 児玉 正博

出版者

公益社団法人 精密工学会

雑誌

精密機械 (ISSN:03743543)

巻号頁・発行日

vol.45, no.540, pp.1492-1496, 1979-12-05 (Released:2009-06-30)

参考文献数

4

被引用文献数

1

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In order to clarify the self-loosening mechanism of threaded joints which are subjected to ultrasonic vibration in the axial direction, the separating phenomena between the bearing surfaces are investigated experimentally and theoretically. The obtained conclusions are as follows : (1) The theoretical values of the amplitude on the assumption that the bearing surface may begin to separate when the amplitude of vibrational stress on the surfaces reaches the mean compressive stress by tightening force approximately agree with the experimental ones. Then the above-mentioned value, which is called “Critical Amplitude at the Separation between Bearing Surfaces”, is proposed as a criterion of self-loosening of threaded joints. (2) The separation between bearing surfaces is affected by lubricating condition. The critical amplitude with silicone grease is larger than that with machine oil or without lubricant in the range of this experimental conditions.