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題 名 | 含脫層複材疊層夾心樑的挫曲與振動之再探討=Re-Examination of the Buckling and Vibration of the Delaminated Composite Sandwich Beams |
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作 者 | 胡潛濱; 畢天祐; | 書刊名 | 力學 |
卷 期 | 17:1 2001.06[民90.06] |
頁 次 | 頁27-38 |
分類號 | 440.2 |
關鍵詞 | 複合夾心板; 脫層挫屈強度; 自然頻率; 有限元素法; 橫向剪應力; Composite sandwich plates; Delamination; Buckling load; Natural frequency; Finite element method; Transverse shear stress; |
語 文 | 中文(Chinese) |
中文摘要 | 近幾年我個人曾針對複材疊層夾心板建立一合理之理論模式,並利用這一模式推導出挫曲和自由振動等問題之閉合解,進而探討這類結構件之最佳化組合。因為這類構件較易在心材與面材之間發生脫層,吾人亦曾將此一理論模式延伸至含脫層的複材疊層夾心樑,並順利導得相關問題之閉合解。然而因為脫層表面無曳引力之要求與原理論模式在心材部分之剪應力分布不易契合,使得我們極想了解這樣的理論模式所得到的結果與實際狀況之差異到底有多大?是否需要修正我們的理論模式?因此藉由本文同時進行理論、數值與實驗分析,比較其間之差異,進而修正我們的理論,使它更能符合實際的力學行為。在文中,我們設計含脫層夾心樑的挫曲及振動實驗,並配合商用有限元素軟體NASTRAN所分析的結果,來證明對於含脫層夾心樑所發展理論模式的正確性和實用性。 |
英文摘要 | Recently, my co-workers and I developed a theoretical model for the mechanical analysis of the composite sandwich plates. Through this model, several analytical closed-form solutions have been obtained, such as the solutions for the buckling loads and natural frequency, etc. Furthermore, an optimal arrangement for the composite sandwich plates has also been made by using these closed-form solutions. For the composite sandwich plates with delamination lying along the interface between the face and core, the closed-form solutions of the buckling load and natural frequency are obtained only for the one-dimensional structures, i.e., beams. However, due to the discrepancy between the requirements of the traction-free delamination and the assumption of the transverse shear stress distribution of the core material, the suitability of this theoretical model needs to be clarified. Therefore, in this paper, we studied the problems of delaminated composite sandwith beams by using the theoretical, numerical and experimental methods simultaneously to understand the correctness of the theoretical model. By comparison among their results, we revised our theoretical model to suit for the real structures. In order to prove that the developed physical model of the delaminated composite sandwich beams is useful, we design the buckling and vibration experiments and reprove it by the results from the finite-element software NASTRAN. |
本系統中英文摘要資訊取自各篇刊載內容。