臺灣博碩士論文加值系統

兩物體表面間的溫度提升是滑動過程中的重要影響因子，因為它會影響接觸體的摩擦與磨損特性。當試件在摩擦期間，粗糙表面的頂點之間的接觸會導致溫度快速升高，並且高於整體溫度。本文利用三維繪圖軟體(SOLIDWORKS)建立由上下滑塊所組成的接觸模型，結合了有限元素分析(FEA)軟體，給予不同的壓力、滑動速度與熱膨脹係數，模擬滑塊接觸情形，得到在不同操作條件情況下溫升參數、應力應變分佈的變化。
結果顯示:(1)當兩物體行相對運動時，摩擦產生之熱量集中在波峰接觸表面上，且會傳遞至波峰內部與周圍。(2)相同粗糙度相同材料下，當壓力增加，接觸間隙會降低，溫升參數會增加。(3)而對於相同材料在相同壓力下，隨著波峰高度增加，兩物體間的接觸間隙也會增加，而由於物體摩擦，溫升參數也會增加，可知壓力與粗糙度對溫升參數有很大影響。(4)比較三種材料，軸承鋼(SUJ2)、結構鋼(A36M)與鋁合金(Al6051-T6)，最大溫升參數出現在鋁合金中，而最小溫升參數則在軸承鋼。(5)由於鋁合金在本實驗中有較高的蒲松比與較低的降伏強度，鋁合金會出現最大等效應力。(6)上滑塊的最大剪應力受壓力變化影響明顯，相同表面粗糙度，壓力增加最大剪應力也會增加。

The surface temperature rise between surfaces is an important factor during sliding because it affects the friction and wear properties of contact bodies. When the components in the mechanism are moving, friction between the components must occur. The contact between the peaks of the rough surface of the component during the friction causes the temperature to rise rapidly and is higher than the bulk temperature. In this thesis, three-dimensional drawing software (SOLIDWORKS) is used to establish a contact model composed of upper and lower sliders. Finite Element Analysis (FEA) Software is combined to simulate the contact situation of the components, considering the different pressures, sliding speed, and thermal expansions for the different metals. The correlation between temperature rise parameter, the stress-strain distribution under different operating conditions and the change can be obtained.
The results shows: (1) When the relative motion is performed, the friction is generated and the heat is concentrated on the peak portion of the surface summits, and the heat is transmitted to the surroundings and the interior of body. (2) For the same materials with the same roughness, the contact gap decreases and the temperature rise parameter increases when the pressure increases. (3) For the same material, and constant pressure, as peak asperity height increases the contact gap between two body’s increases as a result the temperature rise parameter increases due to increase in friction. Pressure and roughness have strong impact on temperature rise parameter. (4) Comparing the three materials i.e., A295M (SUJ2 steel), A36M (Structural steel), Al 6051-T6 (Aluminum alloy). The maximum temperature rise parameter occurs in the Al 6051-T6 and the minimum temperature rise parameter occurs in the A295M. (5) The Maximum Equivalent Stress occurs in the Al 6051-T6 under surface roughness due to high Poisson’s ratio and low yield strength in the Al 6051-T6 compared to A295M and A36M. (6) The maximum shear stress values of the upper slider are affected by the pressure change; under the constant surface roughness and increased pressure results in the maximum shear stress.

Abstract.....i
摘要.....iii
Acknowledgement.....iv
Table of Contents.....v
List of Tables.....viii
List of Figures.....ix
List of Symbols.....xix
Chapter 1 Introduction.....1
1.1 Research Purpose.....2
1.2 Parallel Wear Test Machine.....3
1.3 Literature Review.....5
1.3.1 Contact Temperature Literature Review.....5
1.3.2 Stress-Strain Literature Review.....7
Chapter 2 Theoretical Basics.....10
2.1 Hertz Contact Theory.....10
2.2 Heat Transfer Theory.....11
2.2.1 Conduction.....12
2.2.2 Convection.....13
2.2.3 Radiation.....14
2.3 Frictional Contact Theory.....14
2.3.1 Sliding Friction.....15
2.3.2 Transient Thermal.....15
2.3.3 Flash Temperature Theory.....15
Chapter 3 Finite Element Analysis Software and Problem Solving Analysis.....17
3.1 Introduction to Finite Element Analysis Software.....17
3.2 Engineering Data.....18
3.3 Geometry Establishment.....22
3.4 Meshing.....24
3.4.1 Edge Sizing Meshing.....25
3.5 Inflation.....26
Chapter 4 Results and Discussions.....28
4.1 Geometry Model Setup.....28
4.2 Forward Stress Distribution and Contact Gap of the Peak Surface.....30
4.2 Finite Element Analysis Verification.....33
4.3 Temperature Rise Parameter Vs Contact Gap for A295M of Roughness (Rq) = 0.54 μm. .....35
4.4 Temperature Rise Parameter Vs Contact Gap for Al 6051-T6 of Roughness (Rq) = 0.54 μm......39
4.5 Temperature Rise Parameter Vs Contact Gap for A36M of Roughness (Rq) = 0.54 μm......42
4.6 Temperature Rise Parameter Vs Contact Gap for A295M of Roughness (Rq) = 1.06 μm.....45
4.7 Temperature Rise Parameter Vs Contact Gap for Al 6051-T6 of Roughness (Rq) = 1.06 μm.....48
4.8 Temperature Rise Parameter Vs Contact Gap for A36M of Roughness (Rq) = 1.06 μm.....51
4.9 Temperature Rise Parameter Vs Contact Gap for A295M of Roughness (Rq) = 1.48 μm.....54
4.10 Temperature Rise Parameter Vs Contact Gap for Al 6051-T6 of Roughness (Rq) = 1.48 μm.....57
4.11 Temperature Rise Parameter Vs Contact Gap for A36M of Roughness (Rq) = 1.48 μm.....60
4.12 Normal Stress Vs Pressure.....65
4.13 Contact Area ( μm2 ) Vs Roughness ( μm )......67
4.14 Maximum Temperature Rise Parameter Vs Pressure.....68
4.15 Maximum Temperature Rise Parameter Vs Maximum Contact Area.....70
4.14 Shear Stress Vs Contact Gap.....77
4.15 Experimental Results.....82
4.16 Analysis Results on A29M.....85
Chapter 5 Conclusion.....87
5.1 Temperature Rise Parameter......87
5.2 Stress-strain.....87
5.4 Future Work.....88
References.....89
Extended Abstract.....93

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