为了揭示纬密对芳纶三维贯穿角联锁复合材料拉伸性能的影响规律,制备了3种规格的复合材料(经密均为24根/cm,纬密分别为18根/cm、21根/cm和24根/cm)。分别采用实验和有限元分析法对上述材料进行了拉伸性能研究,并分析了材料的失效机制。结果表明:经向拉伸强度随纬密的增加单调递减,纬向拉伸强度随纬密的增加单调递增;增加经纱数量可以改善三维贯穿角联锁复合材料经纬向拉伸性能的差异性;复合材料在承受拉伸载荷时,与拉伸方向取向相同的纱线为主承载体,树脂起到固定纱线和传递应力的作用。
In order to reveal the influence of weft density on the tensile properties of aramid three-dimensional interlocking composites,three specifications of composites were prepared (warp density of 24 picks/cm,and weft density of 18 picks/cm,21 picks/cm,and 24 picks/cm,respectively).The tensile properties of the above materials were studied using experimental and finite element analysis methods,and the failure mechanisms of the materials were analyzed.The results indicated that the warp tensile strength decreased monotonically with the increase of weft density,while the weft tensile strength increased monotonically with the increase of weft density.Increasing the number of warp yarns could improve the differential tensile properties of three-dimensional interlocking composites in the warp and weft directions.When composites were subjected to tensile loads,the yarns oriented in the same direction as the tensile direction were the main carriers,and the resin played a role in fixing the yarns and transmitting stress.
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基金资助
国家重点研发计划项目(2018YFC0810300);国家级大学生创新训练项目(202210304037Z);江苏省研究生科研与实践创新计划项目(KYCX24＿3530、KYCX24＿3523和KYCX24＿3526)
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