Performance of interlayer toughened carbon fiber/epoxy composites of low areal density PA66 fiber veil
In order to improve the interlaminar fracture toughness of carbon fiber/epoxy(CF/EP)composites,four polyamide 66 fiber veils(PA66V)with different areal densities were prepared by wet-laid method,and then the toughened fiber veils were inserted into the carbon fiber unidirectional cloth layer,and the CF/EP composite material was prepared by curing and molding by vacuum assisted resin infusion(VARI)process.In this paper,the interlaminar fracture toughness of mode Ⅰ (GⅠ C)and mode Ⅱ(GⅡC)of CF/EP composites before and after toughen-ing was tested,and the toughening mechanism of CF/EP composites after the introduction of PA66V was revealed by SEM images of the cross-section,and the effect of the introduction of veils on other mechanical properties of CF/EP composites was studied.The results show that the addition of PA66V with an areal density of 4 g/m2 in-creases the GⅠC and GⅡC of CF/EP composites by 13.6％and 139.8％,respectively,and its toughening mechanisms mainly include bridging and pulling,plastic deformation and crack deflection of PA66 fibers.At this time,the inter-laminar shear strength and tensile strength of CF/EP composites are also increased by 6.5％and 5.2％,respectively.
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