超音波振動補助等通彎角擠製之有限元素分析

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張致維(Chih-wei Chang) 查詢紙本館藏

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機械工程學系

論文名稱

超音波振動補助等通彎角擠製之有限元素分析

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摘要(中)

等通彎角擠製為一種有效及常見之方法使得材料產生大量塑性變形，進而使得晶粒細化以達到強化材料機械性質，因此本文使用商業有限元素軟體DEFORM-3D，分析超音波輔助等通彎角擠製加工鋁1070問題，本文首先根據實驗之結果，驗證有限元素軟體DEFORM-3D對於等通彎角加工分析之適妥性，接著利用沖頭附加軸向超音波振動輔助等通彎角擠製，探討不同振幅，不同外圓弧角度(Ψ)對沖頭負載與擠製料片之應變分布。其結果顯示，超音波對於降低沖頭負載以及應變分布均勻性皆具有良好效應，並且透過增加振幅可以提高其效應。

摘要(英)

Equal-channel angular extrusion is a prominent and effective method for achieving ultra-fine grain (UFG) structured among the various severe plastic deformation (SPD) techniques. The effect of ultrasonic vibration on aluminum 1070 alloy in the ECAE process is analyzed using DEFORM-3D software by finite element methods (FEMs). Firstly the result of experiment is applied to improve the accuracy of DEFORM-3D software in ECAE process. The effect of different ultrasonic amplitudes and outer corner angles (Ψ) on the punch load and strain inhomogeneity is discussed . The result reveals that ultrasonic vibration can decrease the punch load and improve the strain inhomogeneity by increasing the ultrasonic amplitude

關鍵字(中)

★ 超音波
★ 等通彎角擠製
★ FEM

關鍵字(英)

★ Ultrasonic
★ ECAE
★ 有限元素分析

論文目次

目錄
摘要 i
Abstract ii
目錄 iii
表目錄 vi
圖目錄 vi
符號索引 ix
第一章緒論..................................................1
1-1 前言..................................................1
1-2 文獻回顧..............................................2
1-3 研究動機與目的........................................8
第二章基本理論.............................................12
2-1 Update Lagrangian Formulation (ULF)理論..................12
2-2有限元分析基本概念...................................13
2-3超音波加工基本理論...................................18
2-4等通彎角基本理論.....................................20
2-5 DEFORM求解超音波等通彎角擠製之設定與操作程序.......24
第三章 DEFORM有限元素介紹.............................28
3-1基本假設.............................................28
3-2 DEFORM之架構與各部份功能之介紹....................29
3-3 DEFORM的設定與操作程序.............................31
3-3-1前處理器(Pre-processor)..........................31
3-3-2後處理器(Post-processor).........................33
第四章結果與討論...........................................34
4-1實驗驗證.............................................34
4-1-1 有限元素模型之沖頭負載驗證......................36
4-1-2 有限元素模型之應變分布驗證......................36
4-1-3 超音波全程加載與部分區段加載之應變分布分析......37
4-2軸向超音波振動輔助等通彎角擠製(ECAE)之分析............38
4-3軸向超音波振動對等通彎角擠製之效應...................38
4-3-1軸向超音波振動對沖頭負載之效應...................39
4-3-2軸向超音波振動對應變分部之效應...................40
4-4 外圓弧角度(Ψ)改變對軸向超音波輔助等通彎角擠製(ECAE)之效應.................................................42
4-4-1 外圓弧角度(Ψ)改變對軸向超音波輔助等通彎角擠製(ECAE)之沖頭負載效應...................................43
4-4-2外圓弧角度(Ψ)改變對軸向超音波輔助等通彎角擠製(ECAE)之應變分部效應...................................44
第五章結論與建議..........................................46
5-1 結論.................................................46
5-2 建議.................................................47
參考文獻.......................................................48
附錄...........................................................79

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指導教授

葉維磬(Wei-ching Yeh)

審核日期

2013-8-29

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