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姓名 陳容彥(JUNG-YEN CHEN)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 超音波振動輔助鋁合金6061及低碳鋼S15C拉伸試驗之研究
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摘要(中) 本文旨在觀察超音波振動對材料行為的影響,為了觀察不同結構之材料且兼顧到拉伸試驗設備之極限抗拉強度,本實驗使用之試片材料為面心立方的鋁合金6061和體心立方的低碳鋼S15C,並以拉伸速率、超音波振幅和超音波加載的應變範圍為因子,實驗結果顯示振幅大小和塑流應力的下降幅度成正比,且拉伸速率越慢,其下降的塑流應力幅度也越大;在同樣的超音波輔助拉伸試驗條件中,面心立方的鋁合金6061會比體心立方的低碳鋼S15C擁有更大幅度的應力下降。
摘要(英) The aim of the study is to observe the impact of ultrasonic vibration on the material behavior. To explore the different types of materials and to balance the ultimate tensile strength, the materials employed in the study are the aluminum alloy 6061 of face-centered cubic and the low-carbon steel SI5C of body-centered cubic. Moreover, tensile speed, ultrasonic vibration, and strain range of ultrasonic loading are considered as the factors. The results of the study demonstrate that the magnitude is positively correlated with the descender of flow stresses. Also, if the tensile speed is slower, the descender of the flow stresses would become larger; likewise, in the same condition of ultrasonic-assisted tensile test, the aluminum alloy 6061 of face-centered cubic has greater stress drop than the low-carbon steel SI5C of the body-centered cubic.
關鍵字(中) ★ 超音波振動
★ 拉伸試驗
關鍵字(英)
論文目次 目錄
摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章 緒論 1
1-1 前言 1
1-2 研究目的與動機 1
1-3 文獻回顧 2
第二章 基本理論 8
2-1 超音波基本理論 8
2-1-1 體績效應 8
2-1-2 表面效應 11
第三章 實驗設備與方法 19
3-1 實驗設備 19
3-1-1 拉伸系統 19
3-1-2 應變規 19
3-1-3 應變節取系統 19
3-1-4 超音波輔助系統 20
3-2 實驗方法 24
3-2-1 試棒製作 24
3-2-2 實驗步驟 25
3-2-3 實驗條件 27
第四章 實驗結果與討論 45
4-1 疊加超音波振動對鋁材6061在單軸試驗的力學行為之影響 46
4-1-1 僅考慮拉伸速率的影響 46
4-1-2 超音波振動振幅對超音波輔助加工的影響 47
4-1-3 拉伸速率與超音波振動振幅交互作用的影響 47
4-1-4 超音波振動在不同應變範圍加載之效應 48
4-1-5 超音波振動對拉伸試驗和壓縮試驗(自由邊界)的效果 48
4-2 疊加超音波振動對低碳鋼S15C在單軸拉伸試驗的力學行為之影響 48
4-2-1 僅考慮拉伸速率的影響 49
4-2-2 超音波振動振幅對超音波輔助加工的影響 49
4-2-3 拉伸速率對超音波振動輔助加工的影響 49
4-3 超音波振動對於不同材料結構的效應 50
4-4 材料的微觀結構 50
第五章 結論與建議 62
5-1 結論 62
5-2 建議 63
參考文獻 64
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指導教授 葉維磬 審核日期 2018-8-16
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