界面性能对哑铃状短纤维增强复合材料增强效果的影响

采用有限元方法分析哑铃状短纤维及平直短纤维增强复合材料。重点探讨界面剪切强度对两种材料模型增强效果的影响，对哑铃状材料模型的适用性进行了研究。数值计算中将材料看作理想弹塑性体，沿界面划出一薄层界面单元，从而引入了界面性能的影响，通过对钢丝／锡材料的分析可以看出一薄层界面界面剪切性能对两种材料模型的增强效果有很大影响，特别是在弱界面情况一采用哑铃状短纤维模型可以大大提高增强效果。

EFFECT OF INTERFACE PROPERTY ON STRENGTHENING EFFICIENCY OF DUMBBELLSHAPED SHORT-FIBRE REINFORCED COMPOSITE

The finite element method was adopted to analyze the dumbbell-shaped and plain short-fibre reinforced composites. Emphasis was put on discussing the effect of interface property on strengthening efficiency of two models. The adaptability of dumbbell-shaped short-fibre model was also studied. The elastic-plastic model was used to make the numerical calculation and one layer of interface element was divided so that the effect of interface property was introduced. From the analysis of steel wire reinforced tin composite, it was revealed that the interface property affects the strengthening efficiency of two models heavily. Especially under the condition of weak bonding interface, the dumbbell-shaped short-fibre model could increase the strengthening efficiency greatly. The analysis method and numerical results could be used as a reference to the design of short-fibre reinforced composites.