2D hierarchical lattices' imperfection sensitivity to missing bars defect  

作　　者：Bo Wang Yunfeng Shi Rui Li Youwei Chen Yihua Mo 

机构地区：[1]State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology [2]Beijing Institute of Astronautical Systems Engineering

出　　处：《Theoretical & Applied Mechanics Letters》2015年第4期141-145,共5页力学快报（英文版）

基　　金：supported by the 973 Program(No.2014CB049000,2011CB610304);National Natural Science Foundation of China(11372062,91216201);LNET Program(LJQ2013005);China Postdoctoral Science Foundation(2014M551070);111Project(B14013)

摘　　要：Commercially available lattices contain various kinds of morphological imperfections which result in great degradation in lattices＇ mechanical properties, therefore, to obtain imperfection insensitive lattice structure is obviously a practical research subject. Hierarchical structure materials were found to be a class of promising anti-defect materials, This paper builds hierarchical lattice by adding soft adhesion to lattice＇s cell edges and numerical results show that its imperfection sensitivity to missing bars is minor compared with the classic lattice. Soft adhesion with appropriate properties reinforce cell edge＇s bending stiffness and thus reduce the bending deformation in lattice caused by missing bars defect, which is confirmed by statistical analysis of normalized node displacements of imperfect lattices under hydrostatic compression and shear loads.Commercially available lattices contain various kinds of morphological imperfections which result in great degradation in lattices＇ mechanical properties, therefore, to obtain imperfection insensitive lattice structure is obviously a practical research subject. Hierarchical structure materials were found to be a class of promising anti-defect materials, This paper builds hierarchical lattice by adding soft adhesion to lattice＇s cell edges and numerical results show that its imperfection sensitivity to missing bars is minor compared with the classic lattice. Soft adhesion with appropriate properties reinforce cell edge＇s bending stiffness and thus reduce the bending deformation in lattice caused by missing bars defect, which is confirmed by statistical analysis of normalized node displacements of imperfect lattices under hydrostatic compression and shear loads.

关 键 词：Hierarchical structures LATTICES Imperfection sensitivity Elastic properties Missing bars 

分 类 号：O469[理学—凝聚态物理]