Monitoring Of The Curing Process Of Composite Materials And Performance Of Impact Based On FBG Sensors

Fiber reinforced composites is widely used in various fields because of their high specific strength and specific stiffness. However, the process of composite materials in use are easy to suffer low-energy impact, and also more sensitive to the impact load. When the impact velocity is high, the composite laminate will be broken down; with impact velocity decreases, the damage will generate different forms of material, such as matrix cracking, fiber breakage and delamination. Most of the damage of composite materials is not a single impact, often after repeated low energy impacts before the material failure. The majority of composite materials have no obvious visual damage when suffered low-energy impact, but the laminated surface will generate superficial delaminate. It may create potential dangerous. The presence of internal damage can cause huge losses in strength and stiffness of composite material. So we should attach great importance to low-speed impact damage problems of composite laminates.In this paper, the impact resistance of fiber reinforced composite laminates was studied. the impact mechanism of composites, the damage appearance after impact, the breakage damage characteristics and energy absorption during breakage process were expounded in detail. First, by using VARI (Vacuum Assisted Resin Infusion) molding technology, composite laminates were produced. In the process of preparation, FBG sensors were embedded in the composite laminates to curing the temperature and strain changes in the molding process, this provides a good basis for improvement. Then buried FBG sensors laminated composite plates for impact performance testing and analysis, through the wavelength signal changes of the FBG sensor, we can judge and assess the laminate impact damage condition, this provides more accurate basis for composite materials intelligent control, It is of great significance. The paper introduces application of the FBG sensors on aircraft composite health monitoring, impact resistance of aircraft composite materials will directly related to the flight crew's safety, so the safer design of composite materials and real-time monitoring of the situation seems Particularly important.