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研究生:宋宜駿
研究生(外文):Yi-Chun Sung
論文名稱:鋁合金/APC-2奈米複材積層板之高溫機械與疲勞性能之探討
論文名稱(外文):Mechanical and Fatigue Behavior of Al/APC-2 Nanocomposite Laminates at Elevated Temperature
指導教授:任明華任明華引用關係
指導教授(外文):Ming-Hwa R. Jen
學位類別:博士
校院名稱:國立中山大學
系所名稱:機械與機電工程學系研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:英文
論文頁數:112
中文關鍵詞:疲勞疲勞壽命奈米複合材料積層板高溫機械性能
外文關鍵詞:Mechanical PropertiesLifeFatigueElevated temperatureNanocompositeLaminate
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本文主旨在於研製鋁合金/碳纖維/聚醚醚酮三明治結構創新奈米複合材料積層板,及深入探討其奈米複材積層板在室溫及高溫環境下之機械性能、鑽孔機械性能、疲勞曲線及疲勞極限,並觀察其破壞機制將結果分析、討論並提出結論。
首先,為了克服未經表面處理之鋁合金在複合材料製程上常見之脫層問題,本文在材料前處理上採用二種常見之鋁合金表面處理法,分別為鉻酸化學蝕刻法及鉻酸陽極處理法,二種方法經由一系列之實驗與結果數據驗證,發現鉻酸陽極法擁有更好的抗脫層表現,且在機械性能實驗結果中也優於鉻酸化學蝕刻法。
製程方面,碳纖維/聚醚醚酮奈米複合材料積層板則採用二種疊序,分別為十字疊與類似均向疊,再與經由表面處理後之2024-T3鋁合金薄板熱壓成型,製成鋁合金/碳纖維/聚醚醚酮三明治結構創新奈米複材積層板,其奈米複材積層板經由ASTM D3039規範切割成試片,並採MTS-810萬能材料試驗機獲得其機械與疲勞性能。
在機械性能上,經由實驗獲得不同疊層在室溫及高溫下之應力–應變曲線,將其結果分析並得出預測模型,其預測應力–應變曲線與實驗結果一致,特別在轉折點之預測也相當準確。在鑽孔試片上,本文將改良型PSC預測模型延伸成高溫改良型預測模型,並用此延伸模型預測室溫與高溫下之鑽孔殘留強度,其預測結果再與實驗結果比對下相當準確。
疲勞性能方面,經由實驗獲得不同疊層在室溫及高溫下之應力–疲勞周期曲線與疲勞極限,分析並驗證實驗結果,其預測疲勞曲線與實驗結果吻合。
The innovative Al/APC-2 hybrid nanocomposite fiber metal laminates (FMLs) were successfully fabricated. To overcome the usual problem of delamination, the Al alloy 2024-T3 thin sheets were treated by chromic acid anodic (CAA) method to achieve perfectly bonding with matrix PEEK eventually. It was found much better than the previously surface treatment method of CrO3-based chemical etching. A systematic study of hybrid specimens subjected to both static tensile and fatigue tests was conducted at elevated temperatures to obtain their mechanical properties, fatigue lives and failure mechanisms.
From the tensile tests, the mechanical properties of Al/APC-2 hybrid cross-ply and quasi-isotropic nanocomposite FLMs at elevated temperatures were received, such as ultimate tensile strength and longitudinal stiffness. Also, the predicted stress-strain curves was proposed and in good agreement with experimental data. The average values of received notched strength were affected significantly by stress concentration and high temperature. The modified point stress criterion (PSC) was used with the varied characteristic length dependent on nature of material and specimen geometry. The predicted notched strengths by the modified PSC model were not only precisely validated, but extended to the application at elevated temperatures.
The received fatigue data were plotted in S-N curves at variously elevated temperatures. The predictions of fatigue life curves were also presented and verified. The predicted S-N curves were compared with experimental data and found quite accurate.
摘 要 IV
ABSTRACT V
LIST OF FIGURES IX
LIST OF TABLES XI
I. INTRODUCTION 1
1.1 Background 1
1.1.1 Fiber Metal Laminates 2
1.1.2 APC-2 Nanocomposite 5
1.1.3 Surface Treatment 5
1.1.4 Notch and Residual Strength 6
1.1.5 Fatigue 7
1.2 Research Motive and Achievement 8
II. EXPERIMENTS 11
2.1 Materials 11
2.1.1 APC-2 11
2.1.2 2024-T3 Aluminum 12
2.1.3 SiO2 nanoparticle 13
2.2 Pretreatment 13
2.2.1 Pretreatment of Aluminum sheets 13
2.2.2 Pretreatment of APC-2 nanocomposite laminates 16
2.3 Fabrication of Specimens 16
2.4 Testing 17
III. MECHANICAL PROPERTIES BY CHEMICAL ETCHING METHOD AND CHROMIC ACID ANODIZING METHOD 29
3.1 Results 29
3.2 Analysis 29
IV. NOTCHED STRENGTH 46
4.1 Notched Strength in APC-2 Laminates at Elevated Temperatures 46
4.2 Formulation 46
4.2.1 Brief Review of Whitney-Nuismer PSC Model and Modified PSC Model 46
4.2.2 Extended Modified PCS Model 49
4.3 Modeling 51
4.3.1 PSC Model 51
4.3.2 Extended Modified PSC Model 51
4.4 Notched Strength in Al/APC-2 Nanocomposite Laminates 53
V. FATIGUE 72
5.1 Results 72
5.2 Formulation 72
5.2.1 Brief Review of Semi-log Relationship 72
5.2.2 Temperature Effect on Fatigue Life Prediction 74
5.3 Modeling 74
5.3.1 The First Segment (1 cycle to 103 cycles) 75
5.3.2 The Second Segment (103 cycles to 106 cycles) 76
VI. DISCUSSION 84
6.1 Mechanical Properties by Chemical Etching Method and Chromic Acid Anodizing Method 84
6.2 Notched Strength in APC-2 Laminates and Al/APC-2 Nanocomposite Laminates 86
6.2.1 APC-2 Laminates 86
6.2.2 Al /APC-2 Nanocomposite Laminates 87
6.3 Fatigue 88
VII. CONCLUSION 90
BIBLIOGRAPHY 92
APPENDIX 98
VITA 100
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