Li Juanzi, Fan Wei, Ma Yanli, Xue Lili, Yuan Linjia, Dang Wensheng, Meng Jiaguang
School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, China.
Polymers (Basel). 2019 Aug 1;11(8):1288. doi: 10.3390/polym11081288.
The effects of reinforcement structures and hybrid types on the inter-laminar shear strength (ILSS) of carbon-glass hybrid fibers/bismaleimide composites under thermo-oxidative aging conditions were investigated. The process resulted in progressive deterioration of the matrix and fiber/matrix interfaces, in the form of chain scissions, weight loss, and fiber/matrix debonding, which significantly led to the decrease of the ILSS of composites. Moreover, the three-dimensional orthogonal woven hybrid composites (3D composites) showed higher ILSS retention rate than those of the laminated orthogonal hybrid composites (laminated composites). No delamination occurred in the aged 3D composites like in the aged laminated composites. This was because the Z-binder yarns in the 3D composites resisted the inter-laminar shear load, although the resin was damaged and the adhesive force between fiber bundles and resin decreased seriously after thermo-oxidative aging. Meanwhile, the ILSS retention rate of the laminated composites with the carbon fiber as intermediate layers was higher than that of the laminated composites with the glass fiber as the intermediate layers. This was because the carbon fiber/bismaleimide interface bonding performance was stronger than that of the glass fiber/bismaleimide at the same thermo-oxidative aging condition.
研究了增强结构和混杂类型对热氧化老化条件下碳-玻璃混杂纤维/双马来酰亚胺复合材料层间剪切强度（ILSS）的影响。该过程导致基体和纤维/基体界面逐渐劣化，表现为链断裂、重量损失和纤维/基体脱粘，这显著导致复合材料的ILSS下降。此外，三维正交编织混杂复合材料（3D复合材料）的ILSS保留率高于层压正交混杂复合材料（层压复合材料）。在老化的3D复合材料中没有像在老化的层压复合材料中那样发生分层。这是因为3D复合材料中的Z向粘结纱抵抗了层间剪切载荷，尽管热氧化老化后树脂受损且纤维束与树脂之间的粘合力严重下降。同时，以碳纤维为中间层的层压复合材料的ILSS保留率高于以玻璃纤维为中间层的层压复合材料。这是因为在相同的热氧化老化条件下，碳纤维/双马来酰亚胺界面粘结性能比玻璃纤维/双马来酰亚胺的更强。
