基于拉伸主导的热膨胀点阵超材料带隙特性分析  

Research on band gap characteristics of a stretch-dominated thermal expansion lattice metamaterial

作　　者：刘成龙 吕树辰 许卫锴[1] LIU Cheng-long;LYU Shu-chen;XU Wei-kai(Key Laboratory of Liaoning Province for Composite Structural Analysis of Aerocraft and Simulation,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学辽宁省飞行器复合材料结构分析与仿真重点实验室,沈阳110136

出　　处：《沈阳航空航天大学学报》2021年第3期40-46,共7页Journal of Shenyang Aerospace University

基　　金：国家自然科学基金(项目编号:11502149);辽宁省自然科学基金(项目编号:2019-ZD-0229);辽宁省教育厅基础研究项目(项目编号:JYT19056)。

摘　　要：当前科技的发展对材料的多功能性提出了更高的要求。基于有限元方法和布洛赫理论,针对基于拉伸主导型的热膨胀点阵超材料进行了带隙特征研究,分析了弹性波在周期性点阵超材料中传播的色散性能,并讨论了不同的构型和材料参数对其带隙的影响。结果表明,该热膨胀构型在满足热膨胀系数可调控功能以及一定刚度要求的同时,也存在一定的带隙特性。通过合理的选材和形状设计,有望实现特定膨胀性质和带隙设计的双目标共赢,使复合材料具有更好的可调谐性和多功能性。The current development of science and technology puts forward higher requirements for the versatility of materials.Based on the finite element method and Bloch theory,the band gap characteristics of the stretch-dominated lattice metamaterials were studied,the dispersion properties of elastic waves propagating in periodic lattice metamaterials were analyzed,and the effects of different configurations and material parameters on the band gap were discussed.The results show that the thermal expansion configuration can also have a certain band gap characteristic while meeting the adjustable thermal expansion coefficient and certain rigidity requirements.Through reasonable material selection and shape design,it is expected to achieve the dual goals of specific expansion properties and band gap design,so that the composite material has better tunability and versatility.

关 键 词：点阵超材料 带隙特性 声子晶体 热膨胀系数 周期结构 拉伸主导 

分 类 号：TH113.1[机械工程—机械设计及理论] TB535.1[理学—物理]