The calculation of in-plane equivalent elastic parameters of a grid beetle elytra plate core

• Published in: Mechanics of materials Vol. 161; p. 103999
• Main Authors: Du, Shengchen, Li, Yinsheng, Chen, Jinxiang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2021
• Subjects: Elastic parameters; Energy method; Equivalent model; Grid beetle elytra plate core layer; In-plane compression; Structural mechanics; Energy method; Elastic parameters; Structural mechanics; Equivalent model; In-plane compression; Grid beetle elytra plate core layer
• ISSN: 0167-6636; 1872-7743
• DOI: 10.1016/j.mechmat.2021.103999

To study the mechanical properties of beetle elytra plates (BEPs) with numerical and theoretical methods, this paper selects the basic unit according to the periodicity of the core layer of grid beetle elytra plates (GBEPs) and establishes an equivalent model of the GBEP core layer. The equivalent Young's modulus and equivalent Poisson's ratio of the unit are obtained on the basis of structural mechanics and the energy method. Compared with the results of finite element method (FEM) simulation, the calculation results of this equivalent model are sufficiently accurate when λ1 (the ratio of the cylinder radius to the wall thickness of a core unit) is within a certain range. Compared with the case of the grid plate (GP) core unit of the same size, the elastic parameters of the GBEP core unit show no superiority when buckling is not considered. The in-plane equivalent Young's modulus of the GBEP core unit can reach 7 times that of the honeycomb core element of a similar size, and the larger λ1 is, the higher the GBEP core unit performance. In this paper, an equivalent model of GBEPs is established and compared with GPs and honeycomb plates (HPs) in FEM and theoretical analysis, laying a foundation for the application of the equivalent model in FEM analysis. •This study calculated the in-plane equivalent Young's modulus and Poisson's ratio of grid beetle elytron plates (GBEP) unit, and confirmed that the results are sufficiently accurate.•This study introduced λ1=a/t as a parameter, which can help determine the application range of the equivalent model.•It is theoretically proven that GBEPs have better in-plane compression properties than honeycomb plates.