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題 名 | 纖維強化複合材料損傷分析=Damage Analysis of Fibrous Composite Materials |
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作 者 | 鄭榮和; 蔡妙慈; | 書刊名 | 力學 |
卷 期 | 15:1 1999.06[民88.06] |
頁 次 | 頁59-70 |
分類號 | 440.34 |
關鍵詞 | 纖維強化複合材料; 損傷模型; 有限元素分析; 非線性變形行為; 連體損傷力學; Damage mechanics; Composite materials; Nonlinear deformation; Finite element analysis; |
語 文 | 中文(Chinese) |
中文摘要 | 本論文旨在透過損傷力學 (damage mechanics)的觀點,將構件在負載過程中各 種性質的劣化情形納入考量。探討複合材料結構的非線性變形行為.採用單層 (lamina) 觀 點的損傷模型,以「各主軸方向應力新造成的應變」代表材料在認主軸方向的損傷變數,至 於積層板平面內( in-plane )主軸方向的兩個彈性模數與剪力模數分別對主導該方向之損 傷變數間關係,是以單甄拉伸實驗 [0] �瞗B[90] �磡M [ ± 45] ���虜掑龤A配合古典積層 板理論,再透過數值分析的方式取得,可視為該材料的損傷特性。如此從巨觀機戒性質的遞 減程度即可反應出結構內部不易量化的微觀損傷。不需深入剖析複合材料多種複雜的損傷機 制,亦能兼顧受力後材料性質已具損傷的事實,掌握該複合材料的損傷特性後,將其引進有 限元素分析軟體,模擬單一方向及交錯疊層積層板的拉伸歷程,進行應力對應變關係的預測 ;最後並將由完整試片所獲取的損傷特性,進一步應用於預測具圓孔試片的變形行為,所得 分析結果均能確認本研究所提損傷模型的預測能力。本研究發展的損傷分析程序簡便直接, 並且能貼切地描述構件損傷演變擴展的過程,未來應可藉由適當增加損傷變數的方式,朝向 更複雜的幾何外形或應力狀態進行相關的預測。 |
英文摘要 | This paper employs the concept of continuum damage mechanics to explore the nonlinear deformation behavior of composite structures. A damage model at the lamina scale is proposed based on a hypothesis that the damage variable in each principal direction can be represented by "strain induced by individual stress in the principal material directions." This model allows for obtaining the in-plane elastic moduli in the principal directions of the laminates directly from the measured data of uniaxial tension tests of [0] ��, [90] ��, and [ ± 45] ���� specimens along with classical lamination theory and numerical analysis methods. With this approach, the micro-damage which is difficult to quantify, can be determined from the deterioration degree of the macroscopic mechanical properties without having to resort to detailed investigation of various complicated microscopic damage mechanisms. The proposed model together with the acquired damage characteristics of the composites is implemented in a finite element software which is then used to simulate the tensile processes of both unidirectional composites and laminates. The predicted stress and strain responses are compared favorably with experimental results. Finally, the program is also used to predict the deformation behavior of structures with holes. The predictive capability of the proposed damage model is confirmed once again. The damage analysis procedure developed in this research is simple, straightforward, and is shown to adequately describe the evolutional damage processes in loaded structures. The model can also be easily extended to give similar predictions for the cases with more complicated geometry or under different stress states simply by adding more appropriate damage variables. |
本系統中英文摘要資訊取自各篇刊載內容。