RTM Preparation And Performance Study Of Structurally And Functionally Integrated Carbon Fiber Resin Matrix Composites

"Driven by the "double carbon" policy,China is vigorously developing clean and renewable energy in all areas of the national economy.In addition to the rapid development of wind power during the 13 th Five-Year Plan period,the 14 th Five-Year Plan period has highlighted the new growth point of "up the mountain and down the sea." Carbon fiber resin-based composite wind turbine blades have optimal lightweight performance,high mechanical properties,high corrosion resistance,easy processing,and designability.Thus,carbon fiber resin-based composite blades have become the main driving force for developing high-performance,high-power,and lightweight wind power,with tremendous energy saving and environmental protection technical and economic value.In this paper,for the background of wind turbine blade manufacturing,liquid resin molding transfer(RTM)technology is used to prepare laboratory specimens of carbon fiber resin matrix composites with marine corrosion resistance and finite element simulation of the lay-up composite structure and its mechanical properties;through the analysis by gel time,DSC,TGA for selected resins and DSC,FT-IR for carbon fibres,study of carbon fibre and resin wetting and intrinsic properties to determine carbon fibre modification methods.The RTM process was optimized by regulating the injection pressure and curing temperature.The corresponding specimens’ tensile,bending,impact,and dynamic mechanical properties were investigated to obtain the control law of structural and intrinsic mechanical properties.Finally,the comprehensive performance indexes of mechanical properties in synergy with corrosion resistance and their control mechanisms were obtained through corrosion resistance experiments.The main research results are as follows.When the carbon fiber composites are subjected to tensile forces,they are mainly carried by the 0° layup carbon fibers in the direction of parallel tensile forces,and the tensile strength decreases as the 0° layup decreases;the optimal RTM process parameters are: injection pressure 2.5 MPa,injection speed 40 m L/min,and curing temperature 60°C.Under this process,the unidirectional 12K-T300,6K-T300,and 24K-T300 carbon fiber composites with tensile strengths of 525.61 MPa,548.46 MPa and579.88 MPa,respectively.After the modification of 6K-T300/692-2K system,the wettability between carbon fiber and resin improved,and the best improvement was in the order of tensile strength,impact toughness and bending strength.1wt% of KH-560 solution,the performance of the modification improved the most,tensile strength,impact toughness and bending strength increased by 10.97%,9.08% and 3.3% in turn,when the glass transition The glass transition temperature also increased.Compared with the 6K-T300/692-2K and 24K-T300/692-2K systems,the latter has better corrosion resistance than the former;the weight gain is mainly due to the hygroscopic properties of the compound system and the deposition of particles on the surface of the seawater environment.The degree of influence of corrosive environmental factors is tensile strength,impact toughness,and bending strength in descending order;the fracture failure analysis shows that during the corrosion process,the carbon fiber and resin interface part.The fracture failure analysis shows that during the corrosion process,debonding occurs at the interface between the carbon fiber and resin,and the internal pores increase;after corrosion,the glass transition temperature,stiffness,and hardness of the composite material are reduced.