【2018-0397】齿板-玻璃纤维/聚氨酯泡沫芯夹层梁的低速冲击性能试验

《复合材料学报》优先在线发表论文。

摘  要：提出了一种由齿板(TP)-玻璃纤维(GF)混合面板和聚氨酯(PU)泡沫芯材组成的新型TP- GF/PU泡沫夹层梁，结构中金属板通过齿钉压入玻璃纤维与内部芯材连接，该夹层梁采用真空导入模压工艺制作。通过低速冲击试验，研究了不同冲击能量、纤维厚度和泡沫密度下TP- GF/PU泡沫夹层梁的冲击响应和损伤模式，并与普通的夹层梁进行了对比分析；通过双悬臂梁试验研究了混合夹层梁的界面性能，计算了夹层梁的应变能释放率。结果表明：在22、33、44J能量冲击下，泡沫芯材密度为150 kg/m3混合夹层梁的最大接触力较普通夹层梁分别提高了31.2%、48.6%、33.3%，冲击能量吸收分别增加了17.2%、11.3%、15.5%；随着冲击能量、面板纤维层数以及芯材密度的增加, TP- GF/PU泡沫夹层梁最大接触力增大，密度较低的混合夹层梁损伤形式主要为面板的局部弯曲，而芯材密度较高的则以穿透损伤为主；增加泡沫芯材密度和面板纤维厚度能够提高TP- GF/PU泡沫夹层梁的抗冲击性能，随着芯材密度的增大混合夹层梁的应变能释放率峰值越高，界面性能越好。

关键词：低速冲击；混合夹层梁；接触力；泡沫密度；界面性能

Abstract: A new family of Tooth-Plate-Glass-Fiber(TP-GF)/polyurethane(PU) foam core sandwich beams consisted of tooth-plate-glass-fiber facesheets and a polyurethane foam core were studied, in which tooth plates were connected with foam core through tooth nails. TP-GF/PU foam core sandwich beams were fabricated by a vacuum-assisted resin infusion process. The aim of this article is to investigate the impact response and impact damage of TP-GF/PU foam core sandwich beams with various foam densities and fiber thickness under low velocity impact tests. Double cantilever tests were also conducted to investigate the interfacial properties of TP-GF/PU foam core sandwich beams. An analytical model was used to calculate the strain energy release rate of TP-GF/PU foam core sandwich beams. The test results show that, TP-GF/PU foam core sandwich beams have a better energy absorbing capability than the normal sandwich beams. The maximum contact force and energy absorbing capability increase with the increase of foam core density. The main damage modes for TP-GF/PU foam core sandwich beams with low foam density are facesheet bending. The strain energy release rate of TFFS specimens increase with the increase of the foam density.

Keywords: low-velocity impact; hybrid sandwich beams; contact force; foam density; interfacial properties

作者：谢红磊等，南京工业大学 土木工程学院，南京

通讯作者：万里，南京工业大学 土木工程学院，南京

全文详见中国知网学术期刊优先数字出版。