研究生: |
鄭宇哲 Yu-Jhe Jheng |
---|---|
論文名稱: |
分子動力學模擬單晶銅材的奈米尺寸切削行為 Molecular Dynamics Simulate Nanometric Cutting of Single Crystal Copper |
指導教授: |
林原慶
Yuan-Ching Lin |
口試委員: |
蘇侃
Kan Su 陳炤彰 Jhao-Jhang Chen |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 112 |
中文關鍵詞: | 分子動力學 、塑性行為 、奈米 、銅材 、切削。 |
外文關鍵詞: | Nanometric, Cutting |
相關次數: | 點閱:311 下載:5 |
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本論文利用分子動力學(Molecular Dynamics),模擬奈米尺寸下的正交切削行為,使用鑽石刀具切削銅材的研究。並且改變不同的切削方向、深度、速度,探討其切屑的變形機制與差排滑動行為對切削力的影響,並探討在設定為週期性邊界條件下,模型寬度對模擬結果的影響。所使用的模型在垂直切削方向設定邊界條件,原子間勢能函數在銅原子間採用嵌入原子式模型(EAM)而銅對碳原子則採用二體的Morse勢能函數模型。
模擬的結果顯示,在(001)晶面沿[-100]方向切削中,於剪切區形成(111)或(-11-1)面為滑動系統,並藉此產生塑性變形。在(101)晶面沿[-101]方向切削中,切屑的形成是差排利用(111)平面沿著剪切平面(shear plane)射出與(1-1-1)平面的滑動系統向上滑移所造成。在(101)晶面沿[0-10]方向切削時,切屑形成方式主要為利用[-12-1]方向的原子滑移形成雙晶變形。在不同切深的條件下,隨著切入深度的增加比切削能也會減少,其主要起因於刀腹的摩擦行為。切削速度達到300m/s時在刀斜面處會發生非結晶(微融)現象並使切削力降低,但500m/s時因速度過高則反而造成切削力上升。此外,研究結果顯示周期性邊界的主胞室寬度不足時,則易使結果受影響。
The research study the nanometric cutting of singal crystal copper with the diamond tool by molecular dynamics. The effects of chip deformation and dislocation slip on cutting force are performed with the various cutting directions, depthes and speeds. The study also analyze the influneces of different widths of primary cell on the nanometric cutting process when the periodic boundary conidtion are used. The interactions between Cu atoms in the workpiece are described by a embedded-atom method(EAM) potential ,and interactions between Cu atoms and C atoms are described by two body potential.
The simulation results shows that when the cutting direction is along the [-100] direction on the (001) plane, the partial dislocations are operated on the (111) or (-11-1) slip plane in the shear zone. As the cutting direction is along the [-101] direction on the (101) plane, the formation of chip is caused by the dislocation slip with the (111) shear plane and [1-1-1] slip plane. If the cutting direction is along the [0-10] direction on the (101), twin deformation with the [-12-1] slip direction is responsible for the formation of chip. For different cutting depths, specific energy decreases with cutting depths,resulting from the friction of the tool clearance face. When the cutting speed reaches 300m/s, the amorphous (melting) phenomenon on the tool rake face is produced, causing the decrease of cutting force. However, if the cutting speed reaches 500m/s,causing the increase of cutting force. Additionally, the simulation result proves that the insufficiency of the widths of primary cell obviously influence the validity of simulation results.
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