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研究生： 吳文傑
Wu, Wen-Jei
論文名稱： 高應變率拉伸環境系統建構及鋁合金材料機械行為之測定
High Strain-Rate Tensile Loading System’s Development and its Application to Aluminum Alloys
指導教授： 鄭泗滄
Jenq, Syh-Tsang
學位類別： 碩士
Master
系所名稱： 工學院 - 航空太空工程學系
Department of Aeronautics & Astronautics
論文出版年： 2012
畢業學年度： 100
語文別： 中文
論文頁數： 89
中文關鍵詞： SHTB 、動態應力應變關係 、應變率 、應力波
外文關鍵詞： SHTB, dynamic stress-strain relationship, strain rate, stress wave
相關次數： 點閱：97  下載：4 
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    • 本文主旨在發展拉伸式哈普金森桿(SHTB)之設計，並依此針對6061-T6與6061-O之鋁合金之試片，觀察其動態應力應變關係。首先使用SHIMAZDU AG-X量測在室溫下受到1.3×10-4s-1之應變率下，鋁試片的應力應變關係。除此之外，亦利用SHTB進行應變率在500 s-1 to 1200 s-1範圍內之動態測試。為了檢視與確認本次實驗的準確性與精準度，分別與參考文獻[4]與[8]所執行之6061-O與6061-T6之鋁合金應力應變曲線進行比對，在特定試片下所做出來的結果，其誤差在5.7%內。此外將實驗得到之應力應變曲線數據輸入至有限元素分析軟體內，試片的設定採用多線性塑性段材料組成定律，並檢視與比較模擬與實驗的結果，在鈦合金桿件上之穿透波與入射波的應力波大小。此外， 6061-T6與6061-O試片之應變率效應與所有完整的結果清楚地呈現在本論文研究中。

    The main goal of this work is to design a material tester of Split Hopkinson Tension Bar (SHTB) to acquire the dynamic stress-strain relationships for the relative and relevant specimens that are composed of aluminum alloy 6061-T6 and 6061-O. SHIMAZDU AG-X is used to measure stress-strain relationships for Al specimens at a strain rate of 1.3×10-4s-1 at the room temperature. Besides, Split Hopkinson Tension Bar is also to perform the dynamic stress-strain property with strain rate ranging from 500s-1 to 1200 s-1. In order to check and ensure the adequacy and accuracy of our test, the specific stress-strain curves for 6061-O and 6061-T were compared with Ref (4) & (8), respectively. It shows the consistent and reasonable results for prescribed specimens and the deviation error of the test result is under 6.6%. Subsequently, we take the experimental stress-strain curve into the piecewise-plasticity constitute material model for Al specimen in commercial FEM code - LS-DYNA. Upon examining the simulation and experiment, it shows a good agreement for the transmission and incident waves on the elastic Ti-alloy bar. The strain rate effect is also observed for the specimens of 6061-T6 and 6061-O under high strain rate tension test at room temperature. All of the complete results are presented and reported clearly on this study.

    簽名頁 誌謝 中文摘要 I ABSTRACT II 目錄 III 表目錄 VI 圖目錄 VII 第一章 緒論 1 1-1 研究背景 1 1-2 研究動機 2 1-3 研究目的 2 1-4 研究方法與流程 3 1-5 文獻回顧 4 第二章 實驗理論 7 2-1 基本一維縱向彈性應力波理論 7 2-1-1應力波定義 7 2-1-2 均質長直桿件之一維縱向彈性波傳理論 8 2-1-3 應力波強度表示式 10 2-1-4 撞擊介面產生的反射與穿透現象 13 2-1-5 不連續介面產生的反射波與穿透波 15 2-1-6 邊界條件對應力波的影響 17 2-2 一維彈性波傳理論應用於拉伸式哈普金森試驗設備 20 2-2-1 應變率、平均應變、平均應力 20 2-2-2 應用於SHTB之理論 24 第三章 系統發展與實驗流程 32 3-1 實驗設備設計 32 3-1-1 實驗設備簡介 32 3-1-2 系統設計流程 34 3-1-3 實驗設備校正 35 3-1-4 試片製程 36 3-2 實驗流程 38 3-2-1 實驗相關設備 38 3-2-2 實驗前置作業 39 3-2-3 高應變率拉伸試驗 40 3-2-4 共軸度測試 41 3-2-5 波形之整形法 42 3-2-6 一波法與二波法 43 3-2-7 擬靜態拉伸試驗 43 第四章 實驗結果 55 4-1 動態拉伸試驗 55 4-1-1 Al-6061-T6 55 4-1-2 Al-6061-O 57 4-2 擬靜態拉伸試驗 59 4-2-1 Al-6061-T6 59 4-2-2 Al-6061-O 60 4-3 實驗結果討論 60 4-3-1 Al 6061-T6之實驗結果 60 4-3-2 Al 6061-O之實驗結果 60 第五章 實驗驗證 74 5-1 理論與模擬驗證 74 5-2 模擬與實驗驗證 77 第六章 結論 84 參考文獻 86

    1.T. Nicholas, "Tensile Testing of Materials at High Rates of Strain", Experimental Mechanics, 21, 177-185, 1981.

    2.J. Harding, L. M. Welsh, "A Tensile Testing Technique for Fibre-Reinforced Composites at Impact Rates of Strain", Journal of Materials Science, 18, 1810-1826, 1983.

    3.小栗富士雄、小栗達男, "標準機械設計圖表便覽", 臺隆書店, pp. 3b_24-3b_52, 2001.

    4.S. T. Jenq, and S. L. Sheu, "An Experimental and Numerical Analysis for High Strain Rate Compressional Behavior of 6061-O Aluminum Alloy", Computers & Structures Vol. 52, No. 1, 27-34, 1994.

    5.張桓琥, "多種錫鉛及無錫鉛材料之動態衝擊特性研究", 國立成功大學航空太空工程研究所碩士論文, 2007.

    6.林仁傑, "無鉛銲錫材料在不同溫度下的動態衝及特性研究", 國立成功大學航空太空工程研究所碩士論文, 2008.

    7.許樹林, "使用哈普金森桿量測複合材料在較高應變率時之動態衝壓特性" 國立成功大學航空太空工程研究所碩士論文, 1992.

    8.Xin Tang, V. Prakash, and J. Lewandowski, "Dynamic Tensile Deformation of Aluminum Alloy 6061-T6 and 6061-OA", Proceedings of the 2006 SEM Annual Conference, 2006.

    9.M. Li, R Wang, and M. B. Han, "A Kolsky Bar: Tension, Tension-tension", Experiment Mechanics, 33, 7-14, 1993.

    10.G. H. Staab, A. Gilat, "A Direct-Tension Split Hopkinson Bar for Strain-Rate Testing", Experimental Mechanics, 31, 232-235, 1991.

    11.T. Yokoyama, "Impact Tensile Stress-Strain Characteristics of Wrought Magnesium Alloys", Stain, 39, 167-175, 2003.

    12.K. NAKAI, and T. Yokoyama, "Dynamic Tensile Properties of Nuclear-Grade Graphite IG-11", 6th International Symposium on Advanced Science and Technology in Experimental Mechanics, 2011.

    13.W. Johnson, "Impact Strength of Materials", Edward Arnold, England, pp. 1-50, 1972.

    14.Karl F. Graff, "Wave Motion in Elastic Solids", Dover Publications, INC, New York, pp. 75-139, 1975.

    15.Marc A. Meyers, "Dynamic Behavior of Materials", Wiley Interscince Publication, New York, pp. 23-40, 1994.

    16.Marc A. Meyers, "Dynamic Behavior of Materials", Wiley Interscince Publication, New York, pp. 296-310, 1994.

    17.Kolsky H., “Stress Wave in Solids”, Dover Publications, New York, 1963.

    18.F. P. Beer, E. R. Johnson Jr., J. T. Dewolf, D. F. Mazurek, "Mechanics of Materials", McGraw-Hill, New York, pp. 61-62, 2012.

    19.Bo Song, B. R. Antoun, Kevin Connelly, John Korellid, Wei-Yang Lu, “A Newly Developed Kolsky Tension Bar, Dynamic Behavior of Materials”, SEM Annual Conference, Vol. 1, 447-448, 2011.

    20.A. T. Owens, Development of a Split Hopkinson Tension Bar for Testing Stress-Strain Response of Particulate Composites under High Rate of Loading, Auburn University, 2007.

    21.Weinong W. Chen, Bo Song, “Split Hopkinson (Kolsky) Bar - Design, Testing and Applications”, Springer, New York, pp. 261-289, 2011.

    22."Standard Practice for Heat Treatment of Wrought Aluminum Alloys", ASTM B918/B918M-09, 2009.

    23."Standard Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric)", ASTM B557M-10, 2010.

    24.W. Chen, B. Song, D. J. Frew, and M. J. Forrestal, Dynamic Small Strain Measurements of a Metal Specimen with a Split Hopkinson Pressure Bar, Experimental Mechanics, Vol. 43, No. 1, pp. 20-23, 2003.

    25.H. Huh, W. J. Kang, S. S. Han, A Tension Split Hopkinson Bar for Investigating the Dynamic Behavior of Sheet Metals, Experimental Mechanics, Vol. 42, No. 1, 08-17, 2002.

    26.W. D. Callister, Jr., "Materials Science and Engineering- An Introduction", John Wiley & Sons, Inc., New York, pp. 387-401, 2007.

    27.勢流科技股份有限公司, "結構分析軟體LS-DYNA技術講座Implicit/Explicit", pp. 38-40, 2006.

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