摘要：先進纖維增強復合材料具有高比模量和高比強度等優點，因此在航空航天、兵器、船舶等領域得到日益廣泛的應用。目前大多數數值模型都是把纖維增強復合材料模擬成均勻各向異性體，而沒有對缺口邊緣的應力集中做特殊處理，這樣的模型是不能準確反映復合材料內的應力狀態的。本文建立了一個有效的有限元模型來模擬含缺口的復合材料層合板的破壞行為，通過準確描述缺口邊緣應力場進一步理解了復合材料層合板的破壞機理。為了準確模擬缺口邊緣的應力集中，有限元模型中引入了層內平行于纖維方向的cohesive單元來模擬劈裂。最終數值模擬所得到的破壞形式和破壞載荷與實驗結果進行了對比驗證。

　　關鍵詞：纖維增強復合材料；應力集中；破壞模擬技術；劈裂；內聚力單元

 Failure Analysis Of Notched Fiber-Reinforced Composite Material
Liu Guangyan^*，Tang Kaili
Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology，Beijing 100081，China

　　Abstract:Due to their advantages such as high specific modulus and high specific strength, advanced fiber-reinforced composite materials are being widely used in fields like aerospace, weapons and marine, etc. In most of the numerical models, fiber-reinforced composites are modeled as homogeneous anisotropic plates and no special treatments are taken for the stress concentration at the notch tip. Such models cannot describe the stress states in the composites accurately. An efficient finite element model is created in this paper in order to better understand the failure mechanisms of notched composite laminates. To capture the true stress concentration at the notch tip, in-ply cohesive layers along fiber direction were introduced in the finite element model to simulate the splitting. Failure modes and failure loads obtained from finite element analyses were compared with experimental results to confirm the failure mechanisms of composite laminates.

　　Key words:Fiber-reinforced composite, Stress concentration, Damage modeling technique, Splitting, Cohesive element

　　聯系方式

　　劉廣彥：gliu@bit.edu.cn

責任編輯：趙澤南

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