Ply performance analysis of hybrid warp-knitted biaxial reinforcement material in aramid/glass fiber layer
The aramid/glass fiber hybrid warp-knitted biaxial fabric is used as the reinforcement,and the epoxy resin is used as the matrix.Based on the vacuum-assisted molding process,the composite material is made.The influence of the ply angle,ply thickness and ply sequence of the aramid/glass fiber hybrid warp-knitted biaxial fabric on the bending performance and low-velocity impact performance is investigated.The results show that when the ply angle is[(0°)/(-45°)/(90°)/(45°)]s,the bending strength and low-velocity impact load are the largest,which are 197.1 MPa and 14 259.4 N,respectively.The increase of the number of layers will enhance the bending performance and low-velocity impact performance of the material to a certain extent.With the increase of the number of layers,the thickness increases,and the bending strength becomes worse.In the bending test and low-velocity impact test,it is better to select 0°/90° for the fibers near the loading direction,and the more symmetrical the angle of each layer of fabric is,the better the performance is.It is confirmed that the composite materials needed to meet the working conditions can be obtained through appropriate ply design to a certain extent.
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