中文摘要：

以碳纳米管增强树脂基复合材料的二维平面模型为对象,在考虑基体材料非线性的情况下,探讨碳纳米管增强复合材料的界面层特性对复合材料破坏形态的影响。通过对破坏端部的局部处理,提出两种提高复合材料抵抗损伤破坏能力的方法。第一种方法是改变纤维及界面层端部与基体的界面特性即软化界面,用内聚力模型模拟界面,通过内聚力阻扰裂纹的扩展;第二种方法是改变碳纳米管的端部形状即封闭碳纳米管及界面层,通过改变碳纳米管的应力分布状态来提高复合材料的抗破坏能力。

英文摘要：

In this study,a two dimensional model of carbon nanotube reinforced composites is applied to investigate the effect of interfacial characteristics on damage mode of nano reinforced polymer composites with the nonlinearity of the matrix considered.Two approaches are employed to delay the progress of damage for nano composites： the first one is a cohesive zone model,in which a special softening interface is established between the end of fiber and matrix and the cohesive traction is applied to resist the crack propagation;the second is the closed carbon nanotube with closed interface layer,in which the stress distribution around the nanotube is readjusted to improve the capability of failure resistance.