Erosion Damage Behavior Of Glass Fiber Reinforced Resin Matrix Composites Under Environmental Factors

Xinjiang has abundant wind resources,and the construction of wind power plants is at a high-speed development stage.The demand for healthy operation and maintenance of large-scale wind power plants is huge.The environmental aging,fatigue,fracture and erosion damage of wind turbine blades directly affect the efficiency and life of wind turbines.The complex and variable climate characteristics make the damage and damage of wind turbine blades more complicated.Therefore,the artificial damage accelerated aging test method was used to study the erosion damage behavior of glass fiber reinforced epoxy vinyl ester resin matrix composite(GF/EVE)in complex service environment(UV,saline,alkali).A variety of characterization methods were used to describe the micro-interface debonding mechanism and damage evolution behavior of GF/EVE plates.This research contributes to the development of resin-based composites with high weatherability and their application in the wind power industry.The change of erosion weight loss rate of GF/EVE at specific erosion angle,erosion particle size and erosion velocity is discussed.The erosion damage mechanism is explored by analyzing the change of erosion weight loss rate and erosion morphology.Artificial accelerated aging test method was used to investigate the changes of GF/EVE tensile,bending and erosion properties in ultraviolet,deionized water and alkali corrosion environments,and different aging based on infrared spectroscopy,scanning electron microscopy and thermogravimetric analysis.The GF/EVE aging mechanism and interface damage characteristics in the environment are described.It is concluded that the weight loss rate of GF/EVE erosion increases with the aging time in the UV aging environment,the photo-oxidative degradation of the resin matrix,the debonding of the resin-fiber interface and the cross-linking of the resin matrix lead to the embrittlement of the resin.It is the main reason for the decline of material properties;the diffusion of water molecules in deionized water and alkali solution,the hydrolysis of the resin matrix will lead to weakening of the sample(stretching,bending,erosion),and the alkali solution will accelerate the decline of material properties.The GF/EVE erosion damage characteristics and aging mechanism in alkaline-ultraviolet cycle aging environment were investigated.The GF/EVE moisture absorption rate,microstructure,surface element content,initial resin decomposition temperature and scouring were analyzed by different cycle aging cycles.The experimental results show that the coaction of photo-oxidative,hydrolysis reaction and water diffusion cause the GF/EVE surface resin aging degradation and fiber decomposition and also cause fiber and resin matrix to debond.The breakdown of resin molecular chain and the decrease of resin crosslinking density cause the decline of initial decomposition temperature of resin under circulation aging.The erosion mass loss rate decrease by 2.06% at the first aging cycle and the erosion mass loss rate increase by 32.8% at the end of aging.