Band Gap Characteristics of Planar Stretch-Dominated Thermal Expansion Lattice Metamaterial
Haibo Yuea, Wei Wangb, Weikai Xub, Shasha Yuanc
aZhengzhou Institute of Mechanical and Electrical Engineering, No. 126, Jingguang Middle Road, 450015, Zhengzhou City, Henan Province, China
bSchool of Civil Engineering and Architecture, Suqian University, No. 399, Huanghe South Road, 223800, Suqian City, Jiangsu Province, China
cShenyang Municipal Engineering Design Research Institute, No. 37, Wencui Road, 110016, Shenyang City, Liaoning Province, China
Full Text PDF
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 stretching-dominated lattice metamaterials are studied, the dispersion properties of elastic waves propagating in periodic lattice metamaterials are analyzed, and the effects of different configurations and material parameters on the band gap are discussed. Afterwards, an optimal design of the lattice metamaterial is proposed to maximize the relative band gap width. 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 dual goals of specific expansion properties and band gap design, so that composite material has better tunability and versatility.

DOI:10.12693/APhysPolA.140.438
topics: lattice metamaterial, coefficient of thermal expansion, band gap characteristics, optimal design