2D周期蜂窝结构面内静动态压缩力学行为研究

MECHANICAL BEHAVIOR OF 2D PERIODIC HONEYCOMBS UNDER IN-PLANE UNIAXIAL COMPRESSION

基于"平板开缝-装配-焊接"工艺制备了以高聚物为基体的Kagome等蜂窝结构,并开展了Kagome,正三角形和菱形蜂窝结构的面内准静态压缩力学行为实验研究,实验过程中应用CCD图像采集系统和图像相关法对试件进行了全场位移监测.另外对比传统正六边形蜂窝,采用数值分析技术,模拟了低速冲击下不同蜂窝结构坍塌行为.实验结果和数值模拟均揭示了在材料用量和结构尺寸完全相同的情况下,Kagome蜂窝结构的面内能量吸收性能优于其它3种蜂窝结构,并发现了Kagome蜂窝压缩变形时所特有的局部蜂窝旋转变形.研究结果表明改变蜂窝形状和周期性排布会对蜂窝结构整体的变形模式以及能量吸收性能产生较大的影响.

In the present study, polyvinylchloride （PVC） and polypropylene （PP） ＂based honeycomb structures with different inner cell topologies, such as Kagome, Triangle and Diamond, are fabricated with the ＂Strip slotting- Assembling-Welding＂ technique. The quasi-static crush behaviors under in-plane compression are experimentally investigated for Kagome, Triangle and Diamond cell structures. The Charge Couple Devices （CCD） camera and digital image correlation （DIC） method are applied to obtain the the whole strain-field of the structures. Experimental results suggest that the energy absorption performance of Kagome structure is superior to others with the same materials volume and structural sizes. In addition, a special rotation deforma- tion mechanism of Kagome honeycomb structures is addressed. Moreover, numerical analyses of Kagome and Triangle cells under low velocity impact are studied in comparison with the results from the known Hexagonal cells. The numerical results show that the Kagome cells with the rotation deformation behavior have better energy absorption performance than triangle and hexagonal cells. Both experimental and numerical results indicate great sensitivity of the local honeycomb morphology to deformation and energy absorption.