Indexed by:Journal Article

Date of Publication:2014-04-01

Journal:ACTA MECHANICA SINICA

Included Journals:CSCD、ISTIC、EI、SCIE

Volume:30

Issue:2

Page Number:191-197

ISSN:0567-7718

Key Words:Lattice material; Light weight design; Size effect; Extented multiscale finite element method

Abstract:The size effects of microstructure of lattice materials on structural analysis and minimum weight design are studied with extented multiscale finite element method (EMsFEM) in the paper. With the same volume of base material and configuration, the structural displacement and maximum axial stress of micro-rod of lattice structures with different sizes of microstructure are analyzed and compared. It is pointed out that different from the traditional mathematical homogenization method, EMsFEM is suitable for analyzing the structures which is constituted with lattice materials and composed of quantities of finite-sized micro-rods. The minimum weight design of structures composed of lattice material is studied with downscaling calculation of EMs-FEM under stress constraints of micro-rods. The optimal design results show that the weight of the structure increases with the decrease of the size of basic sub-unit cells. The paper presents a new approach for analysis and optimization of lattice materials in complex engineering constructions.