纳米碳管增强复合材料界面特性对力学性能影响的数值分析

Numerical analysis of the influence of interfacial characteristics of nano-tube reinforced composites on their mechanical properties

假设纳米碳管与树脂基体之间存在一薄层界面,以纳米碳管、界面和基体组成的三层柱体复合材料特征体积单元为研究对象,采用纳-微观均质化理论方法分析界面的模量、体积比、排列方式等的变化对纳米碳管增强复合材料力学性能的影响,所得结果与多相经典平均Mori-Tanaka法进行比较。结果清晰显示了界面模量、体积比的变化对纳米碳管增强复合材料力学性能的影响,有效地区分了含界面纳米碳管在不同排列方式下的力学性能,为纳米碳管增强复合材料力学性能的设计和优化提供计算依据。

It is assumed that there is a thin interface between nano-tube and polymer matrix in nanotube reinforced composites. With the multi-layer composite cylinders representative volume element as the object of research, the global-local homogenization method is applied to analyze the influence of interfacial modulus, volume fraction and array method on the mechanical properties of nano-tube reinforced composites, and the results are compared with those from the multi-phase classical average Mori-Tanaka method. It is found that the interfaeial parameters have obvious influence on the effective elastic modulus of nano-tube composites, and its functionalization is significant in improving the properties of nano-tube composites. At the same time, the global-local homogenization model is effective in describing the effect of interfacial modulus on mechanical properties of nano-tube composites.The conclusions given in the paper provide a basis for the design and optimization of nano-composites with excellent mechanical properties.