金月芽期刊網

和“friction”相關的論文

  • Experimental investigation of Tie6Ale4V titanium alloy and 304L stainlesssteel friction welded with copper interlayer 相關: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 相關:GEOTEXTILES GEOMEMBRANES LANDFILLS
  • 逆向差速攪拌摩擦焊接材料塑性流變和熱場的數值模擬 相關:逆向差速攪拌摩擦焊 數值模擬 產熱模型
  • 逆向差速攪拌摩擦焊接是一種攪拌針與軸肩分離并逆向差速旋轉的攪拌摩擦焊接新工藝。為了實現逆向差速攪拌摩擦焊接的工藝優化,掌握焊接工藝參數對接頭組織和性能的影響規律,需要深入研究這一新工藝涉及的熱物理機制。綜合考慮焊接過程中的摩擦產熱和塑性變形做功作用,建立逆向差速攪拌摩擦焊接過程中材料流動與熱分布的三維耦合數理模型,研究焊接過程中溫度分布特征、材料流動規律、攪拌頭附近的應變速率分布以及黏度分布情況,獲取焊接過程中攪拌頭附近的材料流動規律、應變速率以及黏度分布的規律。對比分析逆向差速攪拌摩擦焊與常規攪拌摩擦焊在溫度分布、材料流動以及攪拌頭附近應變速率和黏度分布的差異。焊縫橫斷面的數值模擬結果與試驗實測結果基本吻合。
  • 固定軸肩攪拌摩擦焊技術的發展 相關:固定軸肩攪拌摩擦焊 復雜結構件 焊縫性能
  • 固定軸肩攪拌摩擦焊技術為金屬連接提供了更多的可能性.對于這種焊接技術很多年前就有過記錄和描述,但直到今天它才逐步被認知、學習和開發,并開始應用于工業生產.這種不轉動的軸肩使得焊縫熱剖面不同于以往,并能夠焊接復雜結構件以及加焊絲.主要描述了TWI對于固定軸肩攪拌摩擦焊技術的開發及其衍生技術,同時也涉及到相關的流程需求和焊縫性能.
  • Numerical estimates of the maximum sustainable pore pressure inanticline formations using the tensor based concept of porepressure-stress coupling 相關: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 相關:INFILTRATION LAMINATE MANUAL
  • KEYWORDS FOR COMPOSITES 相關:INFILTRATION MANUAL VAPOUR
  • KEYWORDS FOR COMPOSITES 相關:INFILTRATION MANUAL VAPOUR
  • KEYWORDS FOR COMPOSITES 相關:INFILTRATION MANUAL VAPOUR
  • Some Aspects of Physical-mechanical Properties of Apple (Malus domestica) Cultivars for High Techniques in Manufacturing 相關: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.