齿板-玻璃纤维/聚氨酯泡沫芯夹层梁的低速冲击性能  

Low-velocity impact behavior of tooth plate glass fiber/polyurethane foam core sandwich beams

作　　者：谢红磊 万里[1] 刘伟庆[1] 裴海平 王璐[1] XIE Honglei;WAN Li;LIU Weiqing;PEI Haiping;WANG Lu(Civil Engineering College, Nanjing Tech University, Nanjing 210000, China)

机构地区：[1]南京工业大学土木工程学院,南京210000

出　　处：《复合材料学报》2019年第5期1092-1100,共9页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金青年基金(51208251);国家自然科学基金重点项目(51238003);江苏省高校自然科学基金重大项目(15KJA580002)

摘　　要：提出了一种由齿板-玻璃纤维(TP-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GF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22J、33J、44J能量冲击下,泡沫芯材密度为150kg/m^3的TP-GF/PU泡沫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TP-GF/PU泡沫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TP-GF/PU泡沫夹层梁则以穿透损伤为主;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TP-GF/PU泡沫夹层梁的应变能释放率峰值越高,界面性能越好。A new family of tooth plate-glass fiber/polyurethane(TP-GF/PU)foam core sandwich beams consisted of TP-GF facesheets and a PU 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,under the energy impact of 22 J,33 Jand 44 J,the maximum contact force of the sandwich beam with a density of 150 kg/m^3 is 31.2%,48.6% and 33.3% higher than that of the ordinary sandwich beams,respectively.The absorbed energy is 17.2%,11.3%,15.5% higher than that of the ordinary sandwich beams,respectively.The maximum contact force increased with the increase of foam core density and impact energy.The main damage modes for TP-GF/PU with low foam density are face sheet bending.The strain energy release rate of TP-GF/PU specimen increase with the increase of the foam density.

关 键 词：低速冲击 混合夹层梁 接触力 泡沫密度 界面性能 

分 类 号：TB332[一般工业技术—材料科学与工程]