三维网络碳纳米管增强环氧树脂复合材料的细观力学  

Microscopic mechanical behavior of reticulate carbon nanotube reinforced epoxy composites

作　　者：刘夏[1] 杨庆生[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《复合材料学报》2012年第3期173-178,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(10872011;11172012);北京市自然科学基金(3092006);教育部博士点基金(20101103110005)

摘　　要：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。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 Youngrs 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.

关 键 词：网络碳纳米管 复合材料 二尺度展开法 细观力学 有效力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]