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和“friction”相关的论文

  • Experimental investigation of Tie6Ale4V titanium alloy and 304L stainlesssteel friction welded with copper interlayer 相关:FRICTION WELDING Tie6Ale4V
  • The basic principle of friction welding is intermetallic bonding at the stage of super plasticity attained with self-generating heat due tofriction and finishing at upset pressure. Now the dissimilar metal joints are especially popular in defense, aerospace, automobile, bio-medical,refinery and nuclear engineerings. In friction welding, some special alloys with dual phase are not joined successfully due to poor bondingstrength. The alloy surfaces after bonding also have metallurgical changes in the line of interfacing. The reported research work in this area isscanty. Although the sound weld zone of direct bonding between Tie6Ale4V and SS304L was obtained though many trials, the joint was notsuccessful. In this paper, the friction welding characteristics between Tie6Ale4V and SS304L into which pure oxygen free copper (OFC) wasintroduced as interlayer were investigated. BoxeBehnken design was used to minimize the number of experiments to be performed. The weldjoint was analyzed for its mechanical strength. The highest tensile strength between Tie6Ale4V and SS304L between which pure copper wasused as insert metal was acquired. Micro-structural analysis and elemental analysis were carried out by EDS, and the formation of intermetalliccompound at the interface was identified by XRD analysis.Copyright 2015, China Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.
  • Shear strength behavior of geotextile/geomembrane interfaces 相关:GEOTEXTILES GEOMEMBRANES LANDFILLS
  • 逆向差速搅拌摩擦焊接材料塑性流变和热场的数值模拟 相关:逆向差速搅拌摩擦焊 数值模拟 产热模型
  • 逆向差速搅拌摩擦焊接是一种搅拌针与轴肩分离并逆向差速旋转的搅拌摩擦焊接新工艺。为了实现逆向差速搅拌摩擦焊接的工艺优化,掌握焊接工艺参数对接头组织和性能的影响规律,需要深入研究这一新工艺涉及的热物理机制。综合考虑焊接过程中的摩擦产热和塑性变形做功作用,建立逆向差速搅拌摩擦焊接过程中材料流动与热分布的三维耦合数理模型,研究焊接过程中温度分布特征、材料流动规律、搅拌头附近的应变速率分布以及黏度分布情况,获取焊接过程中搅拌头附近的材料流动规律、应变速率以及黏度分布的规律。对比分析逆向差速搅拌摩擦焊与常规搅拌摩擦焊在温度分布、材料流动以及搅拌头附近应变速率和黏度分布的差异。焊缝横断面的数值模拟结果与试验实测结果基本吻合。
  • 固定轴肩搅拌摩擦焊技术的发展 相关:固定轴肩搅拌摩擦焊 复杂结构件 焊缝性能
  • 固定轴肩搅拌摩擦焊技术为金属连接提供了更多的可能性.对于这种焊接技术很多年前就有过记录和描述,但直到今天它才逐步被认知、学习和开发,并开始应用于工业生产.这种不转动的轴肩使得焊缝热剖面不同于以往,并能够焊接复杂结构件以及加焊丝.主要描述了TWI对于固定轴肩搅拌摩擦焊技术的开发及其衍生技术,同时也涉及到相关的流程需求和焊缝性能.
  • Numerical estimates of the maximum sustainable pore pressure inanticline formations using the tensor based concept of porepressure-stress coupling 相关:Pore pressureestress coupling
  • The advanced tensor based concept of pore pressure-stress coupling is used to provide pre-injection analytical estimates of the maximum sustainable pore pressure change, APo for fluid injection sce- narios into generic anticline geometries. The heterogeneous stress distribution for different prevailing stress regimes in combination with the Young's modulus (E) contrast between the injection layer and the cap rock and the interbedding friction coefficient, μ, may result in large spatial and directional differences of △Pc. A single value characterizing the cap rock as for horizontal layered injection scenarios is not obtained. It is observed that a higher Young's modulus in the cap rock and/or a weak mechanical coupling between layers amplifies the maximum and minimum △Pc values in the valley and limb, respectively. These differences in △Pc imposed by E and μ are further amplified by different stress re- gimes. The more compressional the stress regime is, the larger the differences between the maximum and minimum △Pc values become. The results of this study show that, in general compressional stress regimes yield the largest magnitudes of △Pc and extensional stress regimes provide the lowest values of △Pc for anticline formations. Yet this conclusion has to be considered with care when folded anticline layers are characterized by flexural slip and the friction coefficient between layers is low, i.e. μ = 0.1. For such cases of weak mechanical coupling, △Pc magnitudes may range from 0 MPa to 27 MPa, indicating imminent risk of fault reactivation in the cap rock. 2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. All rights reserved.
  • KEYWORDS FOR COMPOSITES 相关:INFILTRATION LAMINATE MANUAL
  • KEYWORDS FOR COMPOSITES 相关:INFILTRATION MANUAL VAPOUR
  • KEYWORDS FOR COMPOSITES 相关:INFILTRATION MANUAL VAPOUR
  • KEYWORDS FOR COMPOSITES 相关:INFILTRATION MANUAL VAPOUR
  • Some Aspects of Physical-mechanical Properties of Apple (Malus domestica) Cultivars for High Techniques in Manufacturing 相关:APPLE HARVEST processing
  • Several mechanical and physical properties of five apple cultivars (Black, Apricot, Jester, Big Ariane and Medium Ariane) had been estimated. The results showed that there were important significant differences among the cultivars in most of the parameters that were measured. Among the cultivars, Black cultivar had the highest fruit mass (207.65 g), followed by Big Ariane (188.34 g) and Medium Ariane (137.49 g). The actual fruit volume (cm3) ranged from 61.77 (Apricot) to 269.67 (Black). The highest geometric, arithmetic, square and equivalent mean diameter values were observed for Big Ariane. The surface area and projected area of cultivars were between 14.53-69 cm2 and 45.56-165.33 cm2, respectively. The maximum coefficient of static friction was obtained on plastic followed by steel, iron and glass; the maximum coefficient of dynamic friction was obtained on glass followed by steel, plastic and iron.