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route on the value,distribution,and homogeneity of hardness has been investigated by applying Vickers micro-hardness measurements at various locations of the tube’s transverse planes.Significant... indicate that there is about 50%and 62%reduction of the grain size,compared to the annealed condition,following ECAP process of the copper tube sample after the first and the third pass via route BC......
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University Press and Springer-Verlag Berlin Heidelberg 2017 Abstract: In order to study the dynamic response of concrete-filled steel tube (CFST) columns against blast loads, a simplified model... response of the columns with large axial load ratio against close range blast. The proposed SDOF model can be used in the design of the blast-loaded CFST columns. Key words: concrete-filled steel tube......
Secondary hardening behavior of 15CrMnMoV thin rolled tubeCi DING and Weixin HAN Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China摘 要:15CrMnMoV rolled tube is applied to many critical parts of helicopter. The secondary hardening behavior of the steel which varied with the treating process is essential for further usage......
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Non-steady FE analysis on porthole dies extrusion of aluminum harmonica-shaped tube CHENG Lei(程 磊), XIE Shui-sheng(谢水生), HUANG Guo-jie(黄国杰), WU Peng-yue(吴朋越), HE You-feng(和优锋) State Key...-viscoplasticity finite element method, the porthole die extrusion process of an aluminum harmonica-shaped tube was successfully simulated based on software Deform-3D. The distribution of stress field......
New technology for brazing aluminum clustered tube of refrigeratorHE Peng(何 鹏)1, FENG Ji-cai(冯吉才)1, YU Ze-xing(余泽兴)2, JIA Jin-guo(贾进国)2, MAI Han-hui(麦汉辉)2(1. State Key Laboratory of Advanced Welding... brazing for the aluminum clustered tube of refrigerator was analyzed. According to characteristic of aluminum and aluminum alloy, a kind of high frequency power supply was devised and applied......
the formulation of these defects, the bites condition and contact status between rectangular groove and workpiece during rolling the first and second spring boards were analyzed. Then, a new oval-diamond groove... with design requirement.Key words:roll forging; spring board; oval-diamond groove; rectangular groove; automobile front axles......
words: concealed karst cave; deep rectangular cavity; collapse mechanism; rock mass Cite this article as: HUANG Fu, ZHANG Min, JIANG Zhen. Collapse mode of rock mass induced by a concealed karst cave... karst cave. On the basis of the feature of the roof collapse above a deep rectangular cavity, a failure mechanism is constructed by using arbitrary curves. Employing this failure mechanism, we obtained......