Study On The Mechanical Properties Of Modified Aramid/UHMWPE Weft Jersey Interlayer Hybrid Composite

With the development of science and technology,high-performance fiber composites have gradually replaced traditional materials due to their high specific strength,light weight and good formability,and have been widely used in various fields such as construction,protection,aerospace and so on.Due to the structural characteristics of the weft knitted structure,the composite material has good impact resistance.Aramid fibers and ultra-high molecular weight polyethylene(UHMWPE)fiber composites are widely used as composite reinforcements as three major highperformance fibers,but these two fibers have limited their composites due to the lack of active groups on the surface and the smooth surface Development and application.Therefore,in this subject,the mechanical properties of the two kinds of fiber weftknitted structural composites were investigated.Aramid fibers were modified with nanometer zinc oxide rods on the fiber surface.The effects of three pretreatment methods on the surface morphology,strength before and after modification,surface functional groups and mechanical properties of the composites were investigated.The results showed that after pretreatment with Na OH and HCl,the oxygen-containing functional group COO-of the aramid fiber increased significantly,and the nano-zinc oxide rods on the fiber surface grew more completely without obvious shedding phenomenon.Experiment allowed.The tensile strength,flexural strength,and compressive strength of composite laminates respectively increased by 72.8%,79.3%,and 80.3%.UHMWPE fiber was modified by plasma combined with silane coupling agent.The effect of plasma treatment time on fiber properties and mechanical properties of composites was investigated.The results show that when the plasma modification time is 1 min,the roughness of large and small pits on the fiber surface increases,the surfaceactive functional groups increase,and the hydrophilicity increases.The tensile strength,flexural strength and compressive strength of the composite laminates were respectively increased by 27.7%,66.6% and 65.2%.Three kinds of hybrid lamination methods of aramid fiber / UHMWPE fiber were designed,and the mechanical characteristics of the hybrid composite materials were explored.The results show that the tensile strength,flexural strength,compressive strength,impact strength and compressive strength after impact of the 1 × 1 hybrid mode are all second only to the aramid fiber composite material,and they are superior to the aramid fiber composite material in terms of breaking strain,and The ballistic limit speed and the total energy absorption are optimal.Finally,the subject uses the finite element analysis software ABAQUS to establish a unit cell mechanical model.The simulation values are compared with experimental values.The results are in good agreement with the experimental stress-strain curves.