Characterization of transverse tensile, interlaminar shear and interlaminate fracture in CF/EP laminates with 10 wt% and 20 wt% silica nanoparticles in matrix resins
Characterization of transverse tensile, interlaminar shear and interlaminate fracture in CF/EP laminates with 10 wt% and 20 wt% silica nanoparticles in matrix resins
复制标题
DOI：
10.1016/j.compositesa.2011.08.019
复制
发表时间：
2011-12
影响因子：
8.7
通讯作者：
Youhong Tang;L. Ye;Donghai Zhang;S. Deng
中科院分区：
文献类型：
--
作者：
Youhong Tang;L. Ye;Donghai Zhang;S. Deng
研究了碳纤维/环氧树脂（CF/EP）复合材料的横向拉伸性能、层间剪切强度（ILSS）和Ⅰ型、Ⅱ型层间断裂韧性，并分析了SiO2纳米颗粒对CF/EP复合材料性能的影响。横向拉伸性能和模式I层间断裂韧性（GIC）的增加与基体树脂中的纳米二氧化硅浓度的增加。然而，ILSS和模式II层间断裂韧性（GIIC）随着纳米二氧化硅浓度的增加，特别是对于较高的纳米二氧化硅浓度（20wt%）下降。GIIC值的降低归因于两种主要的竞争机制：一种是与裂纹尖端前45°排列的基体微裂纹相关的拉链状图案的形成，另一种是基体的剪切破坏。GIIC/GIC的比率随着二氧化硅纳米颗粒的浓度而降低，与具有分散在基体中的CNT的类似CF/EP层压板相当。断口分析表明，纯环氧树脂层压板中碳纤维与环氧树脂之间发生界面破坏，而纳米二氧化硅改性的环氧树脂层压板中发生界面破坏和基体破坏，尤其是纳米二氧化硅浓度较高（20wt%）的层压板。
The transverse tensile properties, interlaminar shear strength (ILSS) and mode I and mode II interlaminar fracture toughness of carbon fibre/epoxy (CF/EP) laminates with 10wt% and 20wt% silica nanoparticles in matrix were investigated, and the influences of silica nanoparticle on those properties of CF/EP laminates were characterized. The transverse tensile properties and mode I interlaminar fracture toughness (GIC) increased with an increase in nanosilica concentration in the matrix resins. However, ILSS and the mode II interlaminar fracture toughness (GIIC) decreased with increasing nanosilica concentration, especially for the higher nanosilica concentration (20wt%). The reduced GIICvalue is attributed to two main competing mechanisms; one is the formation of zipper-like pattern associated with matrix microcracks aligned 45° ahead of the crack tip, while the other is the shear failure of matrix. The ratio of GIIC/GICdecreased with the concentration of silica nanoparticles, comparable with similar CF/EP laminates with dispersed CNTs in matrix. Fractographic studies showed that interfacial failure between carbon fibre and epoxy resin occurred in the neat epoxy laminate, whereas a combination of interfacial failure and matrix failure occurred in the nanosilica-modified epoxy laminates, especially those with a higher nanosilica concentration (20wt%).