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論文名稱(中文) 2024-T3鋁合金材料鏽蝕對疲勞行為之影響
論文名稱(英文) Effect of Corrosion on the Fatigue Behavior of 2024-T3 Aluminum Alloy
校院名稱 成功大學
系所名稱(中) 航空太空工程學系專班
系所名稱(英) Department of Aeronautics & Astronautics (on the job class)
學年度 98
學期 2
出版年 99
研究生(中文) 王健雄
研究生(英文) Chien-Hsiung Wang
學號 p4797109
學位類別 碩士
語文別 中文
論文頁數 73頁
口試委員 指導教授-崔兆棠
口試委員-江達雲
口試委員-黃俊榮
口試委員-周玉端
中文關鍵字 交互浸潤鏽蝕  應力-疲勞壽命曲線 
英文關鍵字 alternative immersion corrosion  S-N curve 
學科別分類
中文摘要 本實驗係以2024-T3鋁合金為基材,在實驗室中的人造鏽蝕環境下以交互浸潤鏽蝕法(Alternative Immersion Corrosion Process),對2024-T3鋁合金試片在3.5%的氯化鈉溶液中分別進行7、21及42天的連續浸潤-風乾的鏽蝕程序。在試片完成鏽蝕程序後,施以不同程度的應力進行疲勞試驗,以獲得在不同鏽蝕天數下的應力-疲勞壽命曲線。最後再以電子顯微鏡進行材料斷裂面的孔蝕深度及面積的觀測,藉此找出鏽蝕程度與疲勞壽命間的關係。
實驗結果顯示試片的疲勞壽命隨鏽蝕時間的增加而降低,以在25 ksi循環應力下的結果為例,經7、21及42天浸潤鏽蝕之試片的疲勞壽命分別為86,100、67,200及56,200次循環;後者的疲勞壽命相較於前二者的疲勞壽命衰減的幅度分別約為35%及16%。材料的疲勞壽命係受到鏽蝕深度、孔蝕前端形狀、鏽蝕造成的截面積損失、多區域疲勞裂紋發展及承受應力等各項因素間交互影響而呈現衰減趨勢。
英文摘要 In this study, the 2024-T3 aluminum alloy was used as base material. By using alternative immersion corrosion process with an artificial corrosive environment in laboratory, 2024-T3 aluminum alloy specimens were subjected to continual immersion-dry process in 3.5% sodium chloride solution for 7, 21, and 42 days, respectively. After the corrosion process, the specimens were then subjected to fatigue test at different stress levels and S-N curves of material under different corrosion level were obtained. In addition, through the use of Scanning Electronic Microscope, the depth and dimension of pitting on the fracture surface of specimens were observed.
The experiment results show that the fatigue lives of specimens reduce as the exposure time increases. For example, at the stress level of 25 ksi, fatigue lives of specimens subjected to immersion-dry process for 42 days reduce approximately by 35% and 16%, respectively, as compared to those subjected to processes for 7 and 21 days. Furthermore, fatigue life of material was affected by the combined effects of pit depth, leading edge shape of pit, loss of cross-section, multiple fatigue cracks growth and stress.
論文目次 目 錄
中文摘要 і
英文摘要іі
誌謝іii
表目錄vі
圖目錄vіі

第一章序論1
1-1前言 1
1-2研究動機 3
1-3文獻回顧 3
第二章實驗儀器及程 10
2-1 實驗用試片的前處理 10
2-2 交互浸潤鏽蝕 11
2-3 試片清潔程序 13
2-4 疲勞試驗 14
2-5 電子顯微鏡 14
第三章鋁合金試片疲勞測試結果分析 16
3-1 經7天浸潤鏽蝕之試片的質量損失及疲勞試驗 16
3-2 經21天浸潤鏽蝕之試片的質量損失及疲勞試驗 17
3-3 經42天浸潤鏽蝕之試片的質量損失及疲勞試驗 17
3-4 經7天浸潤鏽蝕之試片的SEM影像分析 18
3-5 經21天浸潤鏽蝕之試片的SEM影像分析 19
3-6 經42天浸潤鏽蝕之試片的SEM影像分析 20
3-7應力-疲勞壽命曲線. 22
3-8 綜合分析 23
第四章結論 27
參考文獻 29
附表 32
附圖 39
自述 73
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