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研究生:陳建翰
研究生(外文):Jian-han Chen
論文名稱:點焊鈑件最佳化設計
論文名稱(外文):Optimal Design of Spot-Welded Metal Sheets
指導教授:黃宗立黃宗立引用關係
指導教授(外文):Zong-li Huang
學位類別:碩士
校院名稱:逢甲大學
系所名稱:機械工程學所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:47
中文關鍵詞:點焊最佳化
外文關鍵詞:spot weldedoptimal
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本文主要利用實驗及ANSYS軟體分析探討點焊板件承受負載時,其焊點位置對結構強度關係之影響,及應用最佳化設計方法求得焊點最佳排列位置。
研究結果顯示:
1. 由分析所得結果與實驗數據之比較,顯示以最佳化方法求得的點焊結構之最大拉伸負荷載為最佳值。
2. 若將焊點位置設計於疊合區的對角線上且假設焊點仍具有對稱性,施焊位置與相疊區域對角線端點之距離以變數R表示,最佳點焊位置R會隨著焊點直徑之增加而增加;最大等效應力也會隨著焊點直徑之增加而減小,但效應不明顯。板厚改變對最佳點焊位置R之效應不明顯;但是最大等效應力則會隨著板厚之增加而顯著減小。
3. 若假設焊點仍具有對稱性且將焊點位置在Y方向設為等距,僅變換施焊位置與鈑邊之距離且以變數X表示,最佳點焊位置X會隨著焊點直徑之增加而增加;最大等效應力則會隨著焊點直徑之增加而減小,但效應不明顯。板厚改變對最佳點焊位置X之效應不明顯;但是最大等效應力也會隨著板厚之增加而顯著減小。
This thesis first introduces the finite element software ANSYS to analyze the spot welded sheets under tensile loading and investigate the effect of welding positions on the strength of the spot welded sheets. It then applies the ANSYS/optimization module to solve for the optimal spot welding positions. The computational results are verified by experimental data in good agreement.
It is shown by the study that:
1. Through the comparison between the computational results and experimental data, it is shown that the maximum tensile load obtained by the optimum procedure is the optimal load.
2. If the spot welding positions are confined to locate on the diagonals of the overlapped region symmetrically, and the distance between the spot welding position and the end of the diagonal is denoted by R, then the optimal welding position, R, will increase with the increase of the diameter of the nugget; the maximum equivalent stress will decrease with the increase of the diameter of the nugget, but not obviously. The variation of the thickness of plate will not influence the optimal welding position, R, significantly. However, the maximum equivalent stress will decrease with the increase of the diameter of the nugget obviously.
3. If the spot welding positions are confined to locate equally in the Y direction on the overlapped region symmetrically, and the distance between the spot welding position and the edge of the plate is denoted by X, then the optimal welding position, X, will increase with the increase of the diameter of the nugget; the maximum equivalent stress will decrease with the increase of the diameter of the nugget, but not obviously. The variation of the thickness of plate will not influence the optimal welding position, X, significantly. However, the maximum equivalent stress will decrease with the increase of the diameter of the nugget obviously.
誌謝
中文目錄
Abstract
目錄
圖目錄
表目錄
第一章 緒論
1.1前言
1.2文獻回顧
1.3研究動機及目的
1.4本文內容概述
第二章 理論基礎
2.1彈塑性有限元素增量分析之力學理論
2.2降伏準則
2.3最佳化問題
第三章 母材拉伸試驗及點焊板材實驗
3.1母材拉伸試驗
3.2點焊板材
3.3最大抗拉實驗結果
第四章 ANSYS之模擬架構及分析步驟
4.1電腦輔助分析軟體ANSYS 之架構簡介
4.2 ANSYS軟體之最佳化方法介紹
4.3點焊鈑件之結構分析
4.3點焊鈑件之結構分析
4.3.1分析過程相關的假設與簡化
4.3.2元素選用與建立有限元素分析模型
4.3.3施加負荷及邊界條件
4.4焊點位置之最佳化設計
4.4.1焊點位置最佳化分析
第五章 結果與討論
5.1以實驗數據驗證分析結果
5.2焊點在對角線上之最佳位置分析
5.3等間距最佳化分析
第六章 結論
參考文獻
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