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    题名: 向量式剛架有限元於二維結構之大變位與接觸行為分析;Large Deformation and Contact Analysis of 2D Frame Structure by the Vector Form Intrinsic Finite Element Method
    作者: 吳思穎;Szu-Ying Wu
    贡献者: 土木工程研究所
    关键词: 接觸;向量式有限元素法;變形座標;顯示時間積分;幾何非線性;Vector Form Intrinsic Finite Element;Geometrically nonlinear;Explicit time integration;Co-rotation approach;Contact
    日期: 2004-12-15
    上传时间: 2009-09-18 17:15:18 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 本論文應用向量式有限元理論模擬平面構架的幾何非線性行為,並加入構件與構件之接觸判斷之分析功能。 向量式有限元素法是以構件和接點為模擬基礎的物理模式,它將連續體定義成一群質點的組合,利用牛頓運動定律描述質點的運動,因此向量有限元的計算變成一組簡單的向量方程式計算。模擬結構問題時利用隨動變形座標系統分解剛體位移和變形位移,因此能夠精確的計算多個連續體同時具有大的剛體運動和大的幾何變形行為,也使得結構非線性分析得以簡化,此外,再配合顯式的時間積分公式及對應的向量運動方程式,使向量有限元分析程式不論在計算速度或模擬精度上都有不錯的結果。 另外,由於接觸碰撞為工程及物理問題中的重要現象,本論文將接觸力學分析方法納入向量式有限元之程序中,並透過標準題驗證,發現所開發之數值模擬程序具有極好之精度及能力。 In this study, the Vector Form Intrinsic Finite Element (VFIFE, V-5) method equipped with the contact detection and analysis algorithm is applied to simulate the large deformation behaviors of frame structures. The V-5 method models the analyzed domain to be composed by finite particles and Newton’s second law is applied to describe each particle’s motion. Thus, the calculation of the V-5 method becomes solving a set of decoupled vector form equations. In the theory of V-5, a convected reference frame and updated deformation coordinate system are used to separate the rigid body motion and pure deformation of the system. After combining these with explicit time integration scheme, the V-5 method can effectively simulate the dynamic behaviors of multi-bodies system having large deformation. To study the impact/ contact problems that commonly admitted in engineering and industry applications, the contact detection and contact force calculation algorithms were developed for the frame elements of the V-5 method. Through the numerical analyses of benchmark problems with large rotation, impact, self-contact characters, the V-5 method demonstrates its accuracy and efficiency on the analysis of frame structure with large deformation.
    显示于类别:[土木工程研究所] 博碩士論文

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