格构增强型复合材料夹层结构的制备与受力性能

MECHANICAL PROPERTIES AND MANUFACTURING PROCESS OF LATTICE REINFORCED SANDWICH COMPOSITES

真空导入成型工艺是一种新型的适合大型/异型复合材料结构件成型的技术。选用H-60 PVC泡沫、四轴向玻璃纤维布以及乙烯基酯树脂,通过在泡沫芯材上、下表面开槽,同时沿芯材厚度方向剖开,采用真空导入成型工艺制备出在结构上具有创新构型的格构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、成型效益高;格构增强型复合材料夹层结构的剪切、平压与抗弯性能均较传统夹层结构得以提高;其格构腹板可有效抑制泡沫芯材剪切裂纹的扩展,避免面板与芯材的剥离破坏;阐明了格构增强型复合材料夹层结构的受弯极限承载能力。

The vacuum infusion molding process （VIMP） is becoming popular as a new type for large-scale/unusual composites. Selecting H-60 PVC foam, four-axis E-glass non-woven fabric and vinyl resin, a type of innovative reinforced sandwich composite as lattice reinforced sandwich （LRS） are fabricated by VIMP. The fabrication results show that VIMP is a high-speed and cost-effective manufacturing method because of the resin flow channel provided by the acuminate grooves in both sides of foam core. The lattice in LRS along core＇ s height assure an even flow on both sides of core that can complete the filling process in a short time. The shear, flatwise compression and flexural behavier of LRS are enhanced compared with the traditional sandwich. The flexural ultimate bearing capacity of LRS are studied which can be used as reference to engineering practice.