本文關(guān)鍵詞：NiTi形狀記憶合金摩擦過程的影響因素研究，，由筆耕文化傳播整理發(fā)布。

【摘要】：鎳鈦合金最重要的兩個特征為記憶效應(yīng)和超彈性。因其具有這樣的特性,使得該合金廣泛應(yīng)用于:宇宙航空、機(jī)械、電子、能源、民生、醫(yī)學(xué)。因為鎳鈦合金具有記憶效應(yīng)及超彈性特性,使得它與其他一般材料的摩擦特性有很大不同。當(dāng)溫度升高至某一特定溫度下(這一溫度值與合金中的鎳含量有關(guān))的時候馬氏體相將發(fā)生向奧氏體相轉(zhuǎn)變的相變過程;當(dāng)溫度下降至某一特定溫度時,奧氏體相將發(fā)生向馬氏體相的逆相變過程。另外,應(yīng)力也會導(dǎo)致合金發(fā)生相變:鎳鐵合金在奧氏體相時,如果有足夠大的載荷作用,將會發(fā)生奧氏體相向馬氏體相轉(zhuǎn)變的相變過程,在卸載后,可自動恢復(fù)原來的相(奧氏體)。如果材料發(fā)生相變,合金的機(jī)械性能將發(fā)生完全改變,導(dǎo)致摩擦磨損性能改變,因此會顯著影響機(jī)器設(shè)備的壽命及運(yùn)行性能。因此通過對鎳鈦合金的摩擦磨損性能過程影響因素(溫度、載荷)的研究,可以為減少摩擦、磨損提供有意義的指導(dǎo)。為了研究宏觀摩擦磨損性能,論文根據(jù)王亞珍[1]建立的Hertz單點(diǎn)接觸模型,利用機(jī)械-分子作用理論對鎳鈦合金的溫度和應(yīng)力影響下的摩擦學(xué)性能進(jìn)行了計算。該模型包括一個鋼球在用鎳鈦合金制造的平面上滑動。對于普通的材料,Hertz單點(diǎn)接觸模型在接觸區(qū)上給出的應(yīng)力分布是一個半橢球體。但是對于鎳鈦合金,應(yīng)力圖不再是一個固定的半橢圓體,而與溫度和載荷有關(guān)。然后,根據(jù)相變溫度圖和應(yīng)力-應(yīng)變圖來確定載荷、溫度和摩擦接觸區(qū)性質(zhì)之間的關(guān)系。根據(jù)理論分析的結(jié)果,本文還進(jìn)行與Herzt點(diǎn)接觸模型一樣工況下的驗證實(shí)驗,實(shí)驗是在MS-T3000摩擦磨實(shí)驗機(jī)上進(jìn)行的,然后利用Taylorsurf-1000對實(shí)驗結(jié)果進(jìn)行了測量與分析。在此基礎(chǔ)上,本文還對微觀摩擦磨損特征進(jìn)行了研究,本文根據(jù)CO振子模型[2]建立的相應(yīng)公式計算靜摩擦力和滑動摩擦力。并利用原子力顯微鏡(AFM)對計算結(jié)果進(jìn)行了驗證。本文對載荷、溫度、速度等因素對于鎳鈦合金因相變引起的宏觀和微觀摩擦磨損過程的影響規(guī)律進(jìn)行了較深入的研究,以期幫助我們找到減摩耐磨的實(shí)用方法和手段。
【關(guān)鍵詞】：NiTi形狀記憶合金 摩擦磨損 Hertz單點(diǎn)接觸模型 CO振子模型 理論分析 實(shí)驗
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TG139.6
【目錄】：

• 摘要5-6
• Abstract6-12
• Table of common symbols12-14
• Chapter 1 Introduction14-37
• 1.1 History of NiTi alloy14-16
• 1.2 Characteristics of Ni Ti alloy16-20
• 1.2.1 Shape memory effect17-18
• 1.2.2 Super-elastic18-20
• 1.3 Application and research status of NiTi alloy20-22
• 1.3.1 Application areas of NiTi alloy20-21
• 1.3.2 Current status and research trends21-22
• 1.4 Status of research problems friction and wear of NiTi shape memory alloy22-32
• 1.4.1 Friction of Ni Ti shape memory alloy22-27
• 1.4.2 Wear of Ni Ti shape memory alloy27-32
• 1.5 Effects of temperature on friction and wear32-35
• 1.6 Meanings and contents of the present thesis35-37
• 1.6.1 Meanings35-36
• 1.6.2 Contents of the present thesis36-37
• Chapter 2 Model of NiTi alloy in Hertz point contact37-55
• 2.1 Introduction37
• 2.2 Molecular mechanical friction theory37-48
• 2.2.1 Nature of molecular mechanical friction37-40
• 2.2.2 Method of defining molecular friction component40-41
• 2.2.3 Mechanical friction component definition method41-45
• 2.2.4 General friction coefficient calculation method45-47
• 2.2.5 Factors affecting friction coefficient47-48
• 2.3 Modeling Hertz point contact for NiTi alloy48-53
• 2.4 Chapter conclusions53-55
• Chapter 3 Experimental research on macro tribological features of NiTi alloy55-75
• 3.1 Introduction55-56
• 3.2 Rules of experimental tribology56-63
• 3.2.1 Nature of external friction56-60
• 3.2.2 Dependence of friction coefficient on normal pressure60-62
• 3.2.3 The dependence of friction coefficient on sliding velocity f=f(v)62-63
• 3.2.4 Dependence of friction coefficient on other parameters63
• 3.3 Experimental equipment, sample and conditions63-65
• 3.3.1 Expermental equipment63-65
• 3.3.2 Sample65
• 3.3.3 Experimental conditions65
• 3.4 Influence of normal load65-70
• 3.5 Influence of sliding speed70-72
• 3.6 Influence of temperature72-73
• 3.7 Chapter conclusions73-75
• Chapter 4 Methods of measuring friction by AFM75-87
• 4.1 Introduction75-76
• 4.2 Structure, principle, operating mode and scan mode of AFM76-80
• 4.2.1 Structure of AFM76-77
• 4.2.2 AFM principle and operation mode77-79
• 4.2.3 AFM scanning mode79-80
• 4.3 Probe of AFM80-81
• 4.4 Methods of surface morphology measurement81
• 4.5 Methods of measuring friction81-84
• 4.6 Heating system of sample84-86
• 4.7 Chapter conclusions86-87
• Chapter 5 Interface friction oscillator model87-99
• 5.1 Introduction87-88
• 5.2 Oscillator friction model88-93
• 5.2.1 Independent oscillator model88-90
• 5.2.2 Composite oscillator model90-91
• 5.2.3 FK model91-92
• 5.2.4 FKT model92-93
• 5.2.5 Coupled oscillator (CO) model93
• 5.3 Definition of friction force basing on coupled oscillator model93-98
• 5.3.1 Coupled oscillator model93-96
• 5.3.2 Calculation of micro friction force while using AFM96-98
• 5.4 Chapter conclusions98-99
• Chapter 6 Experimental research on atomic scale friction of Ni Ti alloy99-122
• 6.1 Introduction99
• 6.2 Experimenting method and data handling method99-105
• 6.2.1 Experimenting steps99-102
• 6.2.2 Relationship between input voltage signal and load value102
• 6.2.3 Methods of measuring friction force and handling data102-105
• 6.3 Influence of normal load105-112
• 6.3.1 Static friction force105-107
• 6.3.2 Sliding friction force107-112
• 6.4 Influence of sliding speed112-116
• 6.5 Influence of temperature116-121
• 6.5.1 Influence of temperature on micro shape surface116-118
• 6.5.2 Influence of temperature on friction force118-121
• 6.6 Chapter conclusions121-122
• Chapter 7 Experimental research on wear features of NiTi alloy122-140
• 7.1 Introduction122
• 7.2 Nature of wear122-123
• 7.3 The factors impacting wear intensity123-125
• 7.4 Experimental research on wear features of NiTi alloy125-139
• 7.4.1 Summary on micro wear features of NiTi alloy125-130
• 7.4.2 Experiment and analysis on macro wear features of NiTi alloy130-139
• 7.5 Chapter conclusions139-140
• Chapter 8 Conclusions and future works140-146
• 8.1 Conclusions140-144
• 8.2 Future works144-146
• References146-158
• 攻讀博士學(xué)位期間取得的研究成果158-159
• Acknowledgements159-160
• 附件160

【參考文獻(xiàn)】

中國期刊全文數(shù)據(jù)庫 前3條

1 姚駿恩;納米測量儀器和納米加工技術(shù)[J];中國工程科學(xué);2003年01期

2 Ｍ．Ｂｉｅｎｉａｓ,Ｋ．Ｈａｓｃｈｅ,Ｒ．Ｓｅｅｍａｎｎ,Ｋ．Ｔｈｉｅｌｅ,趙克功,高思田,徐毅;計量型原子力顯微鏡[J];計量學(xué)報;1998年01期

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  本文關(guān)鍵詞：NiTi形狀記憶合金摩擦過程的影響因素研究，由筆耕文化傳播整理發(fā)布。

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