In order to study the interlaminar mechanical properties of hybrid carbon fiber three-dimensional braided/unidirec-tional(3D/UD)fabric reinforced epoxy resin composites,hybrid composite laminates were prepared by vacuum assisted resin trans-fer molding(VARTM)molding process.The effects of different hybrid ratios,laying angle and layering sequences on the static and dynamic mechanical properties of hybrid carbon fiber reinforced plastic were studied.The results show that the addition of unidirec-tional carbon fiber significantly improves the interlayer static mechanical properties of the hybrid composites,and the interlayer shear properties increase with the increase of the dispersion of the fabric.With the increase of UD fabric lay-up ratio,the bending property and energy storage modulus of hybrid composites first increase and then decrease,while the compression property decreas-es continuously.The layering angle of unidirectional carbon fiber also has a great influence on the mechanical properties of hybrid composites.The static and dynamic mechanical properties of 0° unidirectional carbon fiber hybrid composites are better than those of 30° unidirectional carbon fiber hybrid composites.Under the same hybrid ratio,different layering sequences also have a great influence on the mechanical properties of hybrid composites.The sandwich structure U6/3D/U6(0°)has the highest bending strength and bending modulus,which are 1 210 MPa and 117 GPa,respectively.In addition,the failure of three-dimensional braided layer of hybrid composites is mainly caused by the interface failure between fiber and resin,while the failure of unidirectional layer is mainly caused by fiber fracture and lamination.
three dimensional braidinginterlayer hybridcompositemechanical property
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