Yang Xiaobo, Zhan Lihua, Peng Yifeng, Liu Cong, Xiong Rui
College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
Institute of Light Alloy, Central South University, Changsha 410083, China.
Polymers (Basel). 2021 Aug 17;13(16):2764. doi: 10.3390/polym13162764.
The fiber-resin interface is an important component that significantly affects mechanical properties of composites. Random vibration-assisted vacuum processing (RVAVP), a new method to improve the adhesion of the fiber-resin interface, was presented. The effects of different curing processes on mechanical properties were comprehensively assessed by combining the fiber push-out test, finite element model simulation, cure monitoring approach, and short-beam three-point bending test, and the correlation between fiber volume fraction and mechanical properties was quantified by a facile thermogravimetric analysis-based methodology. The results revealed that application of random vibration during the curing process can promote the impregnation of resin into fibers and impede the growth of interface defects while improving mechanical properties at the same time. For this reason, the laminates produced by RVAVP exhibited the average interfacial shear strength of 78.02 MPa and the average interface fracture toughness of 51.7 J/m, which is obtained a 48.26% and 90.77% improvement compared with the 0 MPa autoclave process. With the large observed increase in micro-mechanical properties, the average interlaminar shear strength of 93.91 MPa showed a slight reduction of 5.07% compared with the 0.6 MPa autoclave process. Meanwhile, the mechanical properties tended to be stable at the fiber volume fraction of 65.5%.
纤维-树脂界面是显著影响复合材料力学性能的重要组成部分。本文提出了一种随机振动辅助真空处理（RVAVP）方法，用于改善纤维-树脂界面的粘结性能。通过结合纤维推出试验、有限元模型模拟、固化监测方法和短梁三点弯曲试验，综合评估了不同固化工艺对力学性能的影响，并采用一种基于热重分析的简便方法对纤维体积分数与力学性能之间的相关性进行了量化。结果表明，在固化过程中施加随机振动可促进树脂对纤维的浸渍，抑制界面缺陷的生长，同时提高力学性能。因此，采用RVAVP制备的层压板平均界面剪切强度为78.02MPa，平均界面断裂韧性为51.7J/m，与0MPa热压罐工艺相比分别提高了48.26%和90.77%。随着微观力学性能的大幅提高，93.91MPa的平均层间剪切强度与0.6MPa热压罐工艺相比略有下降，降幅为5.07%。同时，在纤维体积分数为65.5%时，力学性能趋于稳定。
