本文選題：界面力學(xué)分析　切入點(diǎn)：復(fù)變函數(shù)鏡像法　出處：《哈爾濱工業(yè)大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：固體薄膜潤(rùn)滑在空天、星際和深海等極端環(huán)境條件下的機(jī)械裝置中廣泛應(yīng)用,其在重載等工況下的工作承載能力和運(yùn)行壽命是機(jī)械設(shè)計(jì)關(guān)注的核心指標(biāo)之一。本文以“探月工程”主軸鉆桿的動(dòng)力傳輸與支撐部件——密珠軸系重載下的表面固體薄膜潤(rùn)滑設(shè)計(jì)和實(shí)施為應(yīng)用背景,探索軸承鋼表面常用固體潤(rùn)滑薄膜在重載作用下的失效過程和界面力學(xué)機(jī)制,為密珠軸系的結(jié)構(gòu)與潤(rùn)滑設(shè)計(jì)提供依據(jù)。建立了固體薄膜表面在集中單元力作用下的二維和三維界面力學(xué)分析模型,采用復(fù)變函數(shù)鏡像法,利用固體薄膜的自由表面和連續(xù)界面兩個(gè)邊界條件實(shí)現(xiàn)不同階次的鏡像迭代,計(jì)算固體薄膜和基底的每階鏡像遞推系數(shù)使表面和界面邊界條件得到滿足,最終求解出界面應(yīng)力和變形的解析解。通過對(duì)集中力的積分,獲得膜基系統(tǒng)在法向和切向分布力協(xié)同作用下的二維和三維界面力學(xué)分析模型。針對(duì)常見球形赫茲點(diǎn)接觸形式,為簡(jiǎn)化三維積分過程,利用橫觀各向同性應(yīng)力勢(shì)函數(shù)的解,通過鏡像法直接獲得了膜基系統(tǒng)界面應(yīng)力與變形解。通過與有限元法進(jìn)行對(duì)比驗(yàn)證,該計(jì)算方法具有相同的精度和更快的速度,且對(duì)不同工況參數(shù)具有更好的適應(yīng)性。針對(duì)機(jī)械零件高副接觸中常用的層狀二硫化鉬(Molybdenum disulfide,Mo S2)薄膜和硬脆性類金剛石碳(Diamond-like Carbon,DLC)膜,采用球-盤摩擦和納米/微米劃痕方法測(cè)試了隨載荷變化的薄膜摩擦與失效行為;利用納米壓痕測(cè)試獲取固體薄膜和基底的彈性屬性參數(shù),結(jié)合界面力學(xué)計(jì)算,分析了固體薄膜承載過程中的界面應(yīng)力響應(yīng)規(guī)律和失效過程參數(shù)變化。Mo S2固體薄膜在低界面剪切應(yīng)力下發(fā)生膜內(nèi)層間滑移,而在高界面剪切應(yīng)力下發(fā)生片狀剝落;DLC膜則表現(xiàn)為重載下接觸后端薄膜拉伸斷裂和前端膜基界面錯(cuò)位失效形式。最后,針對(duì)鉆桿密珠軸系的載荷需求開展了密珠軸系結(jié)構(gòu)設(shè)計(jì)和內(nèi)部載荷分析,根據(jù)固體薄膜失效特點(diǎn)及邊界參數(shù)核算了二硫化鉬和類金剛石碳薄膜潤(rùn)滑下的膜基界面應(yīng)力狀態(tài);利用密珠軸系模擬工況試驗(yàn)平臺(tái)完成了固體潤(rùn)滑的應(yīng)用性能測(cè)試。
[Abstract]:Solid film lubrication is widely used in machinery under extreme conditions such as sky, interstellar and deep sea. Its working load capacity and service life under heavy load and other working conditions are one of the key indexes of mechanical design. In this paper, the surface fixation under heavy load of "lunar exploration project" spindle drill pipe and its supporting part-Mizhu shafting is used. Body film lubrication design and implementation for the application background, The failure process and interface mechanics mechanism of solid lubricating film commonly used on bearing steel surface under heavy load were investigated. This paper provides the basis for the structure and lubrication design of the bead shafting. The two-dimensional and three-dimensional interface mechanical analysis models of the solid film surface under the action of concentrated element force are established, and the complex variable function mirror image method is used. Two boundary conditions of free surface and continuous interface of solid films are used to realize different order image iterations. The recursive coefficients of each order image of solid films and substrates are calculated to satisfy the boundary conditions of surface and interface. Finally, the analytical solution of interfacial stress and deformation is obtained. By integrating the concentrated force, the two-dimensional and three-dimensional interface mechanics analysis models of the membrane base system under the synergistic action of normal and tangential distributed forces are obtained. In order to simplify the three-dimensional integration process, the interfacial stress and deformation solutions of the membrane base system are obtained directly by using the solution of transversely isotropic stress potential function, and the results are compared with that of the finite element method. This method has the same precision, faster speed and better adaptability to different working conditions. For the lamellar molybdenum disulfidemolybdenum disulfide MoS _ 2 film and hard brittle diamond-like carbon like carbon DLCL film, which are commonly used in high pair contact of mechanical parts, The friction and failure behavior of thin films varying with load was measured by ball disk friction and nano / micron scratch methods, the elastic properties of solid films and substrates were obtained by nano indentation test, and the interface mechanics calculation was performed. The law of interfacial stress response and the parameter change of failure process during the loading process of solid films are analyzed. The interlayer slippage of MoS2 thin films under low interfacial shear stress is analyzed. However, the flake spalling DLC films under high interfacial shear stress are characterized by tensile fracture at the contact back end under heavy load and dislocation failure at the front end of the films. The structural design and internal load analysis of the bead shaft system were carried out according to the load requirement of drill pipe. According to the failure characteristics of solid film and boundary parameters, the interfacial stress state of the film was calculated under the lubrication of molybdenum disulfide and diamond-like carbon film. The application performance of solid lubrication was tested by using the bead shafting simulation test platform.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG174.4;TH117.2

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