Performance Analysis Of The Thermoplastic Composites Wind Turbine Blade Based On Micro-mechanics

With the rapid development of wind turbine blades towards large-scale,lightweight and green,it is urgent to improve the performance of blade material to increase strength and reduce weight.The thermoplastic composite has the characteristics of small density and recyclable,it is the preferred material for the manufacture of lightweight and green wind turbine blades.At present,the disposal of waste blades by landfill or combustion will destroy the environment,the best solution is to use thermoplastic composites to manufacture wind turbine blades.In order to adapt to the development trend of the global wind power market,it is necessary to carry out the research on the performance analysis of the vane of the thermoplastic composite wind turbine.In this paper,the application background of thermoplastic composites on wind turbine blades is introduced,and a thermoplastic composite CF/PEEK,which meets the requirements of low viscosity infiltration between fiber and matrix is selected,determine the optimum fiber volume ratio is 30%.A high-precision nodal interpolation constitutive model with macro and mesoscopic connection is proposed,the continuity,convergence and periodicity of the model are evaluated.the accuracy and convergence speed meet the application requirements.The apparent modulus of elasticity of CF/PEEK materials is calculated based on the proposed model,and the results are verified by experiment and finite element method.A three-dimensional equivalent volume element model of CF/PEEK material is established.The equivalent model is simulated and stretched by finite element software,and the performance parameters of two axial and three axial fabrics are obtained.The wind turbine blades are laid out from the main girder to the leaf root reinforcement layer respectively.The results show that the CF/PEEK blade is lighter than the GFRP blade and can meet the lightweight design requirements under the same lay up method.Finally,the fluid solid coupling pressure analysis results are used to simulate the blade,which indicates that the actual distribution force is loaded by load,compared with the multi-point constraint loading mode,the distribution force loading method can show the real stress characteristics of the blade better.In this paper,the performances of CF/PEEK and E913/DY5288 materials are compared and analyzed from aspects of strength,dynamic characteristics and stability,the results show that the wind turbine blades of thermoplastic composite have greater advantages in comprehensive performance.This paper provides a new approach for further study of the performance of thermoplastic composite wind turbine blades,and has a certain reference value for the research of wind turbine blade performance.