English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 49378/84106 (59%)
造訪人次 : 7365214      線上人數 : 64
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/70806


    題名: 半球杯拉伸最適化元素剛性法則之研究
    其他題名: The Most Adequate Element Stiffness Scheme on Hemispherical Cup Stretching Process
    作者: 李經綸;盧永華
    貢獻者: 淡江大學機械與機電工程學系
    關鍵詞: 有限元素法;拉製;穩定矩陣;減化積分;擴張;Finite Element Method;Drawing;Stabilization Matrix;Reduced Integration;Expansion
    日期: 1996-12
    上傳時間: 2011-10-23 21:47:45 (UTC+8)
    摘要: 本研究係採用等應變三角形(3-CST)及四邊形四節點等數種有限元素剛性法則,在軸對稱之條件下,分析半球頭板金拉伸成形製程,以探討適用於此製程之最佳剛性法則。同時設計一組拉伸模具,在板金成形機上加以實驗以驗證理論及程式之正確性。由分析結果可瞭解穩定矩陣(SM)法則以及由四個等應變三角形(3-CST)構成的四邊形元素,在沖頭負荷與沖程關係、成品厚度分布上與實驗結果相當一致,然而在不影響計算精度之情況下,穩定矩陣(SM)法則所須之CPU時間約較等應變三角形(3-CST)節省60%的時間。同時用來處理彈塑性狀態和工具與材料界面間之接觸問題的擴張r/sub min/方法,亦證明可正確追蹤整個製程之變形履歷。
    This study uses the 3-CST and four different stiffness schemes for the four-node quadrilateral element to investigate the most adequate element scheme on the axisymmetric hemispherical cup sheet stretching process. Meanwhile, a set of stretching die was designed to perform experiments in the sheet forming machine to verify the accuracy of the theory and computer code. Form the results of the FEM and experiments, the stabilization-matrices scheme and 3-CST schemes showed good agreement with the experiments, especially in the relation of punch load versus stroke, and thickness variation of the workpiece. Most of all stabilization-matrices scheme saved 60% CPU time when it compared with the 3-CST scheme. Furthermore, the technique for the extended r/sub min/ was also proved adequate to trace the whole deformation history on the sheet stretching process.
    關聯: 中華民國力學學會第二十屆全國力學會議論文集(二)=Proceedings of the 20th National Conference on Theoretical and Applied Mechanics (II),頁299-304
    顯示於類別:[機械與機電工程學系暨研究所] 會議論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    index.html0KbHTML81檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋