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論文名稱 Title |
微型質子交換膜燃料電池之微流道壁裂縫尖端三維應力場之數值分析 3-Dimensional Numerical Stress Analysis around a Micro-Channel Wall Crack Tip in a Micro-PEMFC |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
86 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2007-06-22 |
繳交日期 Date of Submission |
2007-07-21 |
關鍵字 Keywords |
燃料電池、應力強度因子、微流道、三維 Fuel cell, Stress Intensity Factor, 3-D, Micro channel |
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統計 Statistics |
本論文已被瀏覽 5679 次,被下載 1563 次 The thesis/dissertation has been browsed 5679 times, has been downloaded 1563 times. |
中文摘要 |
本文主要的目的是針對微型質子交換模燃料電池的微流道板建立三維模型,利用數值模擬方式探討流道板於實際運作上的可靠度分析。存在於流道板上的裂縫會受到由入口進入的燃料H2所產生剪應力作用而增長,使得用來收集電子的銀金屬剝落,降低燃料電池的效率。利用套裝軟體ANSYS建立模型並施加氣體產生的剪應力為負載,模擬出裂縫尖端的應力場,藉由應力場找出三種破壞模式的應力強度因子KΙ、KΙΙ與KΙΙΙ來描述裂縫的行為。最後利用田口法和變異數分析,改變氣體入口壓力、裂縫幾何形狀和流到尺寸,找出影響裂縫行為最大的因素。模擬分析結果顯示KΙ與KΙΙ受裂縫幾何形狀的影響較大,而KΙΙΙ則是受到裂縫幾何形狀和流道尺寸的影響較大。 |
Abstract |
The main aim of this study is to develop three dimensional models for micro flow-field plate of PEMFC and use numerical simulations to discuss the reliability of micro flow-field plate which works in real. A crack exists in the plate is loaded by the shear force, which is produced by the fuel H2 enter from inlet, and will propagate. The Ag, which is used to collect the electrons, will peel off and the efficiency of fuel cell will decrease. The commercial package software ANSYS was used to simulate the stress state around crack tip. Three modes of stress intensity factors KΙ, KΙΙ and KΙΙΙ, were calculated in order to describe the stressed behavior of crack. Finally, the inlet pressure, geometry of crack and channel size is changed and Taguchi method with ANOVA is used to find the factors which influence the stressed behavior of crack most. The simulation results show that KΙ and KΙΙ are influenced most by geometry of crack and KΙΙΙ is influenced more by geometry of crack and channel size |
目次 Table of Contents |
Chapter 1 Introduction 1 1.1 Background of Fuel Cell 1 1.2 Basic Theory of Fuel Cell 2 1.3 Research Objectives 4 1.4 Literatures Review 5 1.4.1 Analysis in Fuel Cell 5 1.4.2 Flow Field in the Micro-Channel 6 1.4.3 Analysis of Cracks 7 1.4.4 Simulation of Cracks in Dissimilar Materials 8 1.5 Structure of the Thesis 10 Chapter 2 Basic Theory 15 2.1 Analysis of Crack in Biomaterial Using Finite Element 15 2.1.1 Finite Element Method 16 2.1.2 Interfacial Cracks in Bimaterial Systems 17 2.1.3 Simulation of Cracks 19 2.1.4 Singular Element—Quarter Point Element 20 2.2 Taguchi Method 22 2.3 Analysis of Variance 24 2.4 Analysis Procedure 26 Chapter 3 ANSYS Model 33 3.1 The Model Use 33 3.2 The Convergence of Mesh Procedure 34 3.3 Accuracy of Model 34 Chapter 4 Results and Discussions 42 4.1 SIF in different Property Proportions and Geometries 42 4.2 Taguchi Method and ANOVA 44 Chapter 5 Conclusions and Future Prospect 68 5.1 Conclusions 68 5.2 Future Prospect 69 References 70 |
參考文獻 References |
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