Using"Ex-situ"toughening technology,polyaryletherketone-methylpyrrolidone(PEK-C/NMP)tough-ening fabric specimens were developed based on existing glass fiber axial fabrics in wind turbine blade roots.The concentra-tion of PEK-C,the usage of PEK-C,and the dotting area of the loaded fabric are selected as the influencing factors,and the compressionstrength after impact is used as the most important index.The orthogonal design L9(34)is appliedfor process optimization.The results show:the optimal toughening process parameters are PEK-Cconcentration of 0.2 g/mL,PEK-C dosage of 25 g/m2,and dotting area of 25％;this scheme could effectively improve the CAI performance of the test pieces by 45.20％,the GIC performance of type Ⅰ interlaminar fracture toughness by 11.23％,and the GIIC performance of type Ⅱ interlaminar fracture toughness by 46.37％.Through the optimization of toughening agent and the continuous im-provement of the process,the interfacial fracture toughness of the glass fiber composite material structure can be significantly improved without changing the production process of wind turbine blades,effectively preventing crack propagation,and ulti-mately improving the fatigue performance of the root components of wind turbine blades.
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