This article focuses on the study of out-of-plane fiber wrinkling defects in L/C-shaped beam structures made of carbon fiber fabric pre-impregnated prepregs.Experimental specimens with different thicknesses were obtained by controlling the process method.The thickness compression before and after curing of the specimens was compared,and the wrinkles were analyzed by metallographic microscope.The results show that the wrinkles in the composite material R region are caused by the restricted interlayer slip of the prepreg in the R region during the molding process,which leads to the ina-bility of fiber direction to be compressed.The degree of thickness compression before and after curing has a significant im-pact on the molding quality of the R region,with larger compression resulting in a higher likelihood of wrinkles in the R re-gion.Compared to the L-shaped structure,the C-shaped structure has a greater restriction on fiber slip,making it more prone to wrinkles in the R region.
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