MARC應用於薄板雷射成型之分析

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藍栢岳(Bo-Yue Lan) 查詢紙本館藏

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機械工程學系

論文名稱

MARC應用於薄板雷射成型之分析
(A study on the deformation of laser formed sheet using MARC.)

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摘要(中)

摘要
本文應用MARC有限元素軟體分析雷射加工板材成型問題。為暸解MARC應用於雷射成型問題的可靠性及妥適性，本文首先利用雷射加工板材成型的實驗比較模擬的準確性，並分別探討加工製程中雷射功率、雷射光徑、板材厚度及加熱時間對於成型角度的影響，進而探討雷射成型機制中溫度梯度機制(Temperature gradient mechanism)與挫屈機制(Buckling mechanism)之差異性，並提出對成型角度臨界值之預測方法。

摘要(英)

Laser forming is an effective and efficient manufacturing technology.In the laser formong process,the bending angle is affected by the temperature distribution and gradient,the mechanical and thermal properties of the sheet metal material,and the process parameters. In this paper,we will use a 3D FEM simulation analysis of the bending angle for different laser powers,laser beam diameters,sheet thicknesses,and heating times.Furthermore,study the differentia between Temperature gradient mechanism and Buckling mechanism.

關鍵字(中)

★ 有限元素法
★ 薄板
★ 雷射成型

關鍵字(英)

★ Laser Forming
★ MARC
★ FEM
★ Buckling

論文目次

目錄
摘要 Ⅰ
目錄 Ⅱ
圖表說明 Ⅴ
第一章緒論
1-1 前言 1
1-2 文獻回顧 2
1-3 研究動機與目的 7
第二章
2-1 有限元素分析基本概念 9
2-2 材料性質定義 12
2-3 熱傳理論 13
2-3-1 基本條件假設 13
2-3-2 熱傳平衡方程 13
2-4 力學理論 16
2-4-1 基本條件假設 16
2-4-2 應力應變增量式 16
2-5 結構耦合熱傳分析模式 21
2-5-1 熱-力學耦合控制方程 22
第三章 MARC有限元素軟體簡介
3-1 MARC 之架構與各部功能介紹 24
3-2 MARC 分析求解技術定義 25
3-2-1 參考座標系統 25
3-2-2 非線性代數方程組疊代求解方法 26
3-2-3 收斂性判斷依據 28
3-2-4 元素技術 29
第四章結果與討論
4-1 MARC分析結果之驗證 32
4-1-1 熱變形問題 32
4-1-2 熱機耦合問題 33
4-1-3 驗證結果 39
4-2 板材雷射加工成型分析 40
4-2-1 雷射功率對於成型角度的影響 41
4-2-2 雷射光徑對於成型角度的影響 42
4-2-3 板材厚度對於成型角度的影響 43
4-2-4 加熱時間對於成型角度的影響 44
4-2-5 成型角度臨界值的初步推測 45
第五章結論與建議
5-1 結論 47
5-2 建議 48
參考文獻 50
附錄一 78

參考文獻

參考文獻
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指導教授

葉維磬(Wei-Ching Yeh)

審核日期

2004-7-19

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