点阵增强型复合材料夹层结构制备与力学性能

Mechanical Properties and Manufacturing Process of Grooved Perforation Sandwich Composites

关键词:  真空导入成型工艺  点阵增强型  复合材料夹层结构  力学性能

Key words:  vacuum infusion molding process(VIMP),grooved perforation sandwich(GPS),sandwich composite,mechanical property

摘要:

选用H-60 PVC泡沫、四轴向玻璃纤维布以及乙烯基酯树脂,通过在PVC泡沫芯材上、下表面开正交布置的齿槽及沿芯材厚度方向穿孔,采用先进的真空导入成型工艺,制备出在玻璃纤维面板与PVC泡沫芯材界面具有创新构型的点阵增强型复合材料夹层结构.研究结果表明:真空导入成型工艺充模速度快、成型效率高;点阵增强型复合材料夹层结构经乙烯基树脂柱增强后,其剪切与平压性能均有一定的提高.另外,通过三点弯曲与四点弯曲试验,观察了试件的典型受弯破坏形态;利用经典夹层梁理论预估了试件抗弯刚度和受弯极限承载力,理论预估值与实测值符合较好.

Abstract:

H-60 PVC foam,four-axis E-glass non-woven fabric and vinyl resin are selected to fabricate a type of reinforced sandwich composite as grooved perforation sandwich(GPS) by the advanced vacuum infusion molding process(VIMP).The interfacial structure between the face and core of GPS is innovative because of the acuminate grooves in both sides of foam core and the holes perforated along core's height.The fabrication results show that VIMP is a high-speed and cost-effective manufacturing method.The shear and flatwise compression properties of GPS are enhanced by the resin column inclusions.The typical flexural failure modes of specimens are observed.The flexural stiffness and ultimate loading capacity of GPS are studied by ordinary sandwich beam theory and the theoretical data tally with the tested data.