Nonlinear mechanical properties of lattice truss materials

被引:47
作者
Fan, H. L. [1 ,2 ]
Jin, F. N. [3 ]
Fang, D. N. [1 ]
机构
[1] Tsinghua Univ, Sch Aerosp, Beijing 100084, Peoples R China
[2] Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
[3] PLA Univ Sci & Technol, Engn Inst Engineer Corps, Nanjing 210007, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Mechanical; Plastic behavior; Failure analysis; PERFORMANCE; BEHAVIOR; KAGOME;
D O I
10.1016/j.matdes.2008.05.061
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An increment equivalent continuum method was developed to study the nonlinear mechanical properties of lattice truss composite materials. As the strut material is brittle or elastic-perfectly plastic, the stiffness method is applicable. The stiffness matrix and strengths of the Kagome lattice core material, the pyramid lattice core material and the corresponding octet-truss lattice were deduced. Initial yield surfaces were depicted by polyhedrons in tri-axial stress spaces, pure shearing stress spaces and compared in two-dimensional stress spaces, respectively. As the strut property was nonlinear, the increment method based on the flexibility method was applied to study the plasticity of strain hardening solids. The complete stress-strain equations were deduced by integration. The suggested increment method was valid to model the complete stress-strain curves of the octet-truss composite and the Kagome lattice core of the sandwich panel. The simulations were well consistent with the reference experimental results. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:511 / 517
页数:7
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