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A Continuum Shell Model Including van derWaals Interaction for Free Vibrations of double-walled Carbon Nanotubes

Computer Modeling in Engineering & Sciences 2015年第4期104卷 305-327页

作者： Salvatore Brischetto Department of Mechanical and Aerospace Engineering Politecnico di TorinoCorso Duca degli Abruzzi2410129 TorinoITALY

This paper proposes the free vibration analysis of double-walled Carbon NanoTubes(DWCNTs).A continuum elastic three-dimensional shell model is used for natural frequency investigation of simply supported *** 3D shell method is compared with beam analyses to show the applicability limits of 1D beam *** effect of van der Waals interaction between the two cylinders is shown for different Carbon NanoTube(CNT)lengths and vibration *** give the van der Waals interaction effect in terms of frequency *** order to apply the 3D shell continuum model,DWCNTs are defined as two concentric isotropic cylinders(with an equivalent thickness and Young modulus)which can be linked by means of the interlaminar continuity conditions or by means of an infinitesimal fictitious layer which represents the van der Waals interaction.

关键词： Exact solution three-dimensional shell model double-walled carbon nanotube van der Waals interaction free vibration

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Reasons and countermeasures for “marking problem” during the production of double-walled copper-brazed steel tubes

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Baosteel Technical Research 2015年第2期9卷 55-60页

作者： YAN Yuanyuan LIANG Gaofei WANG Guodong LIAN Fuliang Research Institute Baoshan Iron & steel Co.Ltd.

This study explores the reasons underlying the frequent appearance of ＂marking problem＂ during the production of double-walled copper-brazed steel tubes. To this end, we compared two types of copper-coated steel strips, of which one has almost no problem during production, whereas the other has higher number of incidences of ＂marking problem＂. We analyzed the chemical composition,mechanical properties,the cross-sectional metallographs, and surface quality of the trimmed edge in both types of specimen. After the roll forming process, the bonding condition between the steel layers of the tubes before and after brazing process has also been examined. Results indicate that the chemical composition and mechanical properties of the two kinds of strips are similar; however, the edge quality of the trimmed strips is significantly different. It is believed that the irregular shape of the edge portions in the strips will be more pronounced during the bevel treatment. Consequently, smooth and tight seams cannot be guaranteed by such uneven beveled edges,which lead to higher number of incidences of ＂marking problem＂ during production.

关键词： double-walled copper-brazed marking problem trimmed edge

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