臺灣博碩士論文加值系統

本研究利用分子動力學(molecular dynamics, MD)研究鎳鐵鈷合金切削加工之機械性能與材料變形特性。在模擬方面，我們以分子動力學研究建構鎳鐵鈷合金，分別在鎳鐵鈷合金上探討超聲橢圓振動輔助切削(UEVAC)以及建構鎳鐵鈷合金與銅之層狀結構材料進行常規切削模擬，最後搭配實驗比較橢圓振動切削模擬結果。在UEVAC方面本研究探討在不同的振動頻率、振幅比與相角之下對材料之機械性能、結構與變形行為所造成的影響結果顯示橢圓振動切削擁有比常規切削還要低的平均切削力，有利於減少刀具磨損。在鎳鐵鈷合金與銅的層狀材料方面，分別建構一到四層之結構材料以及個別生成不同表面粗糙度之對比，探討不同種類之層狀材料之機械特性與結構演變。最後在實驗方面使用超精密車床實現橢圓振動切削驗證模擬結果。模擬結果表示，隨著參入銅之層狀材料有著比一般材料還要更少的差排密度，有利於切削。實驗結果則表明隨著振幅比增加可以獲得較好的加工表面，結果與模擬相同。最後統整歸納出最佳參數，提供對鎳鐵鈷合金材料的切削加工參數與研究成果。

Molecular dynamics (MD) was used to study the mechanical properties and material deformation characteristics by machining nickel-iron-cobalt alloy. In this study, we use molecular dynamics research to construct NiFeCo alloys and discuss ultrasonic elliptical vibration-assisted cutting (UEVAC). Besides, we also constructed layered structure materials of nickel-iron-cobalt alloys and copper for conventional cutting. The structural materials of one to four layers were constructed respectively, and the comparison of different surface roughness was generated separately. In addition, the mechanical properties and structural evolution of different layered materials were discussed. Finally, the simulation results of elliptical vibration cutting are compared with experiments. Specifically, this study explores the influence of different vibration frequencies, amplitude ratios and phase angles on materials' mechanical properties, structure and deformation behaviour. The results show that elliptical vibration cutting has a lower average cutting force than conventional cutting, reducing tool wear. Moreover, in the experiment, the ultra-precision lathe is used to realize the elliptical vibration cutting to verify the simulation results. The simulation results show that the layered material with the addition of copper has less dislocation density than the general material, which is beneficial to cutting. The experimental results show that a better-machined surface can be obtained with the increase of the amplitude ratio, and the results are the same as the simulation. Finally, the optimal parameters are summarized, and the cutting parameters and research results of nickel-iron-cobalt alloy materials are provided.

目錄
摘要 i
Abstract ii
誌謝 iv
目錄 v
圖目錄 ix
表目錄 xiv
符號說明 xv
第一章 緒論 1
1.1 前言 1
1.2 研究動機 3
1.3本文架構 4
第二章 文獻回顧 5
2.1合金及超合金文獻回顧 5
2.2模擬文獻回顧 6
2.3 UEVAC及層狀材料研究文獻回顧 8
第三章 研究方法 10
3.1分子動力學基本理論 10
3.2系綜觀念 11
3.3原子間作用力與勢能函數 12
3.3.1勢能函數 12
3.3.1.1 二體勢能函數 12
3.3.1.2 多體勢能函數 14
3.3.2 勢能設定 15
3.3.3 原子間鍵結 16
3.4初始條件設定 18
3.4.1質心速度修正 18
3.4.2 系統溫度修正 18
3.5週期性邊界條件設定 19
3.6最小映像法則 20
3.7計算驗算 21
3.7.1 Gear五階預測修正法 21
3.7.2 Verlet法 22
3.8截斷半徑 25
3.8.1 CELL LINK表列法 26
3.8.2 Verlet表列法 27
3.8.3 Cell Link與Verlet結合表列法 28
3.9徑向分佈函數 29
3.10 Von-Mises stress 29
3.11橢圓振動切削 30
3.12模擬流程圖 30
3.13 實驗規劃 32
3.13.1 材料製備 33
3.13.2 材料檢測 33
3.13.3 力學及加工特性 34
第四章 物理模型與模擬設置參數 36
4.1 Ni74Fe16Co10橢圓振動切削與常規切削 36
4.2 Ni74Fe16Co10/Cu常規切削 38
第五章 結果與討論 41
5.1 鎳鐵鈷超合金模擬橢圓振動切削與常規切削 41
5.1.1振動頻率參數 41
5.1.2 相角比參數 52
5.1.3 振幅比參數 63
5.2 鎳鐵鈷/銅層狀材料模擬常規切削 74
5.2.1 層數參數 74
5.2.2 表面粗糙度參數 83
5.3實驗結果分析 91
5.3.1 能量色散X-射線光譜 91
5.3.2 電化學腐蝕材料實驗 92
5.3.3 橢圓振動切削實驗 96
第六章 結論 99
6.1結論 99
6.2建議與未來展望 101
參考資料 102
簡歷 113

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