Abstract:In order to investigate the ballistic impact resistance of hybrid composite laminates,hybrid fiber composite laminates with different areal densities and different layup structures were prepared by autoclave co-cured process by using carbon fiber fabric composite layer or glass fiber fabric composite layer combined with aramid fiber fabric composite layer.Through the ballistic impact performance test,the ballistic limit speed v50 and the ballistic performance indicator(BPI,specific energy absorption of penetration) of the hybrid composite laminates were obtained. The morphology and non-destructive testing results indicate that the failure mode of pure aramid composite laminates and hybrid composite laminates after impact are the same.The surface layer of the laminates is shear failure, the intermediate layer is delamination failure,and the back layer is tensile fracture failure.The interlaminar layer sequence has a great influence on the delamination defect area of the hybrid composite laminate.When the carbon fiber layer is used as the back layer, the defect area of hybrid laminate is 12 863.6 mm 2 smaller than that of the glass fiber layer as the back layer which is 17 400.5 mm2;when the aramid layer is used as the back layer, the area of defect of the hybrid composite layer after impact is equivalent to the defect area of the pure aramid composite laminate in the range of 14 151.0 to 14 927.0 mm2.The test results show that the hybrid composite material has a great influence on the ballistic impact resistance of the composite laminates. The v50 of the hybrid composite laminates has a certain degree of improvement.The v50 of the glass fiber/aramid composite laminate has an increment from 193.88 to 204.33 m/s compared to the v50 of pure aramid composite laminate.The hybrid fiber composite laminate with carbon fiber layer or glass fiber layer as the surface layer has better ballistic impact resistance, and their BPI is superior to pure aramid composite laminate.The test results have certain guiding significance for the design and application of hybrid fiber composites in ballistic impact.