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題 名 | 幾何不平整對曲面複材疊層板挫曲行為的影響=Effects of Geometrical Imperfections on the Buckling of Curved Cylindrical Composite Panels |
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作 者 | 葉孟考; 何學書; | 書刊名 | 力學 |
卷 期 | 13:1 1997.03[民86.03] |
頁 次 | 頁45-54 |
分類號 | 440.2 |
關鍵詞 | 挫曲; 曲面複材疊層板; 幾何不平整; Buckling; Curved cylindrical composite panel; Geometrical imperfection; |
語 文 | 中文(Chinese) |
中文摘要 | 本文主要在探討幾何不平整對曲面複材疊層板挫曲行為的影響。在實驗方面,首 先用分厘卡量測曲面複材疊層板各點厚度,並利用量測平臺及線性位移計量測各點的位置座 標,進而應用最小平方法算出各點的曲率半徑;另外,使用拉壓試驗機配合具曲面之夾具測 試各種試片的挫曲強度。在理論分析部份,引用更新拉格朗治之觀念來構建非線性有限單元 之方程式,將曲面複材疊層板劃分成數個八節點退化殼單元,以模擬其承受軸向負載時的挫 曲行為。在求解過程中,先採用負載控制法,並配合修正型牛頓 -- 拉夫森迭代法,以減少 計算時間;在接近挫曲時,使用位移控制法以避免數值發散現象,所得結果與實驗的結果比 較,以厚度及曲率半徑的不平整等為參數,探討這些因素對疊層板挫曲行為的影響。 結果顯示,曲率半徑沿曲面複材疊層板的直邊呈正弦變化時將產生兩種不同的挫曲模態;其 中側向位移往曲率半徑減少方向移動的挫曲模態有較高的挫曲強度。文中並以疊層纖維角度 為參數探討兩種不同挫曲模態時曲面複材疊層板的挫曲強度。 |
英文摘要 | The buckling problems of curved cylindrical composite panels were investigated analytically and experimentally. In the experiment, a tensile-test machine was used to obtain the load-displacement response of the panels, and the buckling strength was found therefrom. In analysis, a nonlinear finite element program based on the updated Lagrangian formulation was developed to analyze the buckling response of the composite panels. The formulation includes large displacements and large rotations. The panels were divided into finite elements and the degenerated shell elements were used. The modified Newton-Raphson method was used to solve the resulting equation for the nonlinear system. A load-controlled scheme was used in the solution procedure at the beginning and then a displacement-controlled scheme was used to obtain the convergence near the buckling load. The results showed that the geometrical imperfections had effects on the buckling behavior of the curved cylindrical composite panels. The inward and outward buckling modes, which resulted in different buckling loads, were observed in experiment and were obtained in the analysis. |
本系統中英文摘要資訊取自各篇刊載內容。