摘要：先进纤维增强复合材料具有高比模量和高比强度等优点，因此在航空航天、兵器、船舶等领域得到日益广泛的应用。目前大多数数值模型都是把纤维增强复合材料模拟成均匀各向异性体，而没有对缺口边缘的应力集中做特殊处理，这样的模型是不能准确反映复合材料内的应力状态的。本文建立了一个有效的有限元模型来模拟含缺口的复合材料层合板的破坏行为，通过准确描述缺口边缘应力场进一步理解了复合材料层合板的破坏机理。为了准确模拟缺口边缘的应力集中，有限元模型中引入了层内平行于纤维方向的cohesive单元来模拟劈裂。最终数值模拟所得到的破坏形式和破坏载荷与实验结果进行了对比验证。

　　关键词：纤维增强复合材料；应力集中；破坏模拟技术；劈裂；内聚力单元

 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

　　联系方式

　　刘广彦：gliu@bit.edu.cn