Design Of Adjustable Lattice Metamaterials Based On Thermal Triggering And Analysis Of Band Gap Properties

The current development of science and technology puts forward higher requirements for the versatility of materials.In the process of service,materials and structures are often subjected to the coupling effect of various factors in the physical field.In addition to a certain special function,the material also needs to have other excellent properties,such as a specific thermal expansion coefficient and band gap properties,which enable the material to maintain a good performance in response to temperature changes and the vibration.This paper analyzes the band gap properties of thermally expanding composite materials based on the characteristics of sound waves propagating in specific structures.The band gap properties of the tensile-dominant thermal expansion lattice material and the bending-dominant thermal expansion lattice material are mainly studied.Furthermore,based on the angle of thermal triggering,the band gap tunability of the two types of lattice metamaterials is discuss.With the help of finite element method,this research is completed using the finite element software COMSOL Multiphysics.Firstly,based on the thermal deformation mechanism of the tensile-dominant thermal expansion lattice material,the energy band structure of various tensile-dominant structures are calculated,and the band gap properties of each structure are given.When satisfying the thermal expansion function of the structure itself,the influence of material geometrical parameters on the band gap range.The result provides a theoretical reference for the design of multifunctional materials considering the band gap properties while designing thermal expansion lattice materials.Secondly,based on the deformation mechanism of the bending-dominant thermal expansion lattice material,the influence of the geometric parameters of the bending-dominant structure on the band structure is calculated.The relationship between three geometric parameters of partial curvature,material thickness ratio,and curvature ratio of the bending structure are given,respectively.The results provide theoretical support for the design of lattice metamaterials with adjustable thermally triggered band gap properties and have certain significance.Finally,this paper presents the design of the adjustable lattice metamaterial based on thermal triggering.By selecting the structure that may realize this function and calculating the thermal deformation,the law of the band gap of several structures with temperature is given.The reason for this rule is analyzed,and the design goal of temperature regulating the band gap properties are achieved.This design makes it a reality to control the energy band structure of the material through the simple external factor of temperature,which provides a blueprint for the design of multi-functional lattice metamaterials.The design itself also has specific potential value in equipment and fields with dual temperature and vibration challenges.