三维网络碳纳米管增强环氧树脂复合材料的细观力学

根据网络碳纳米管/环氧树脂(Reticulate Carbon Nanotubes/Epoxy, R-CNTs/EP)复合材料的结构特点, 假设R-CNT均匀分布, 建立了R-CNT/EP复合材料的三维有限元模型。利用有限元法分析了R-CNT/EP复合材料单胞的细观变形, 用二尺度展开法计算了R-CNT/EP复合材料在不同应变下的有效刚度系数。分析结果表明: R-CNT/EP复合材料为各向异性材料, 沿蒸汽流动方向的强度远大于其他方向的强度, 且R-CNT的形状对R-CNT/EP复合材料的力学性能有显著影响, 各刚度系数以及杨氏模量在Y型接头处各角相等时最大; R-CNT的体积分数对R-CNT/EP复合材料的力学性能有显著影响, 各有效性能均随着R-CNT体积分数的增大而增大, 但是增大程度不同。

Microscopic mechanical behavior of reticulate carbon nanotube reinforced epoxy composites

A three dimensional microscopic model of the reticulate carbon nanotube/epoxy(R-CNT/EP) composites was established according to its structural characteristics based on the assumption of the uniform distribution of R-CNT.The effective stiffness coefficients and Young′s modulus of the R-CNT/EP composite were calculated by two-scale expansion method.It is shown that the mechanical properties of the R-CNT/EP composite are anisotropic and the strength along the direction of the vapor flow is much higher than that in other directions.The shape of the R-CNT plays an important role on the mechanical properties of the R-CNT/EP composite,and the effective stiffnesses and Young′s modulus of the R-CNT/EP composites are the highest when the angles of the Y-junctions are equal.All of the effective stiffnesses and Young′s modulus of the R-CNT/EP composites are enhanced with the increase of volume fraction of R-CNT,but the influence degrees are different.