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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/37828

    Title: 金屬板材半球型沖頭之孔凸緣貫穿成形分析
    Other Titles: The Analysis on the Hole-Flanging Penetration Process of Sheet Metal with Semi-Spherical Punch
    Authors: 李經綸;Li, Ching-lun;陳振德;Chen, Jen-De;李章詠;Li, Chang-Yung
    Contributors: 淡江大學機械與機電工程學系
    Keywords: 彈塑性;有限元素;孔凸緣;貫穿;Elasto-plastic;Finite element;Hole- flanging;Penetration
    Date: 2002-12
    Issue Date: 2010-01-11 14:11:34 (UTC+8)
    Abstract: 本文採用Prandtl-Reuss 塑流法則和Hill 的降伏準則,結合有限變形理論及UpdatedLagrangian Formulation (ULF)的觀念建立一增量型彈塑性大變形有限元素分析程式,探討孔凸緣貫穿成形之等向性、正交異向性及異向性數值分析之沖頭負荷與衝程關係、工件厚度變化及成形極限等,並與實驗結果相比較,以確認本有限元素分析程式的正確性。經由不同Lankford 值R0,R45,R90,及不同沖頭圓弧角半徑對孔凸緣貫穿成形的影響得知,擴孔周緣於滾軋方向90 度的工件厚度大小,依序為異向性分析之厚度最厚,正交異向性次之,最薄為等向性,且在同方向的貫穿高度大小,依序為等向性分析之高度最高,正交異向性次之,異向性最低,而孔凸緣貫穿成形之最大沖頭負荷則隨著沖頭圓弧角半徑的增加而遞減。
    A methodology for formulating an elasto-plastic finite element model, which is based on Prandtl-Reuss flow rule and Hill's yield criterion respectively, associates with an Updated Lagrangian Formulation. The numerical simulation results include relations hip between punch load and punch displacement, variation of the workpiece thickness, and forming limit. The finite element model is developed to simulate isotropic, normal anisotropic, and anisotropic of hole-flanging penetration process. The accuracy of the finite element program is based on a comparison between the simulation and experiment outcomes. Several simulations are performed on diverse Lankford parameters R0, R45, R90 and distinct punch profile radius. When the orientation of expanded hole circumference to rolling direction is at 90.degree.,the thickness of workpieces is various from three types of analyses. Anisotropic analysis determines the thickest workpiece and isotropic analysis the thinnest. As to penetrated height, at the same orientation, isotropic analysis determines the highest workpiece and anisotropic analysis the lowest. When punch profile radius becomes greater, maximum punch load decreases progressively.
    Relation: 中華民國力學學會第二十六屆年會暨全國力學會議論文集,12頁
    Appears in Collections:[機械與機電工程學系暨研究所] 會議論文

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