铺层结构对三维中空夹层复合材料压缩性能的影响

采用手糊成型制备了双夹层三维中空夹层复合材料,重点研究了厚度为5 mm和8 mm的三维中空织物ZK5和ZK8铺层顺序对复合材料压缩强度的影响,并从树脂含量、织物厚度匹配性角度进行分析。结果表明,随树脂含量增加,三维中空夹层复合材料的压缩强度明显提高;双夹层三维中空夹层复合材料中,下层的树脂含量明显高于上层;ZK5和ZK8织物铺层顺序对双夹层中空复合材料的压缩强度影响较大,其中将ZK8置于ZK5下层时复合材料的压缩强度为ZK8置于ZK5上层时的1.7倍,即在三维中空夹层复合材料总厚度不变的情况下,将高厚度中空织物置于下层的结构明显优于将其置于上层的结构。通过这一概念可以在保证三维中空夹层复合材料整体厚度尺寸不变、质量不增加的条件下通过铺层结构的匹配设计,最大限度地提高复合材料的力学性能。

Influence of Layer Structure on Compressive Strength of 3D Hollow Sandwich Woven Composite

3D hollow sandwich woven composite with double sandwiches was prepared by hand lay-up molding. The effects of layer structures of 3D hollow fabrics ZK5 (5 mm thickness) and ZK8 (8 mm thickness) on compressive strength of the composite were emphatically studied,which were also analyzed from the matching of the resin content and fabric thickness. The results show that the compression strength of the composite increases obviously with the increase of resin content. In the 3D sandwich woven composite with double sandwiches,the resin content in lower layer is higher than that of the upper layer. The layer sequence of ZK5 and ZK8 has a greater influence on the compression strength of the composite with double sandwiches,the compression strength of the composite with the layer structure of placing ZK8 below the ZK5 is 1.7 times of that with the layer structure of placing ZK5 below the ZK8,which indicates that under the condition of invariable total thickness of 3D sandwich woven composite,the layer structure of placing high thickness 3D hollow fabric in the lower layer is better than that of placing it in the upper layer. Through this concept,under remaining the same overall thickness size and same weight of 3D hollow sandwich woven composite,the mechanical properties of the composite can be improved to the most extent through the matching design of the layer structure.