Analysis and simulation of high strain compression of anisotropic open-cell elastic foams  

作　　者：LU ZiXing,HUANG JiXiang&CHEN Xin School of Aeronautic Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China 

出　　处：《Science China(Technological Sciences)》2010年第3期863-869,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.10572013,10932001);the Common Construction Project of Education Committee of Beijing (GrantNo.XK100060522)

摘　　要：By elongating the regular Kelvin model in one direction and keeping unchanged in the other two directions,the anisotropic model was constructed.Then,the simplified periodic structural cell was obtained according to the periodicity and symmetry of the model in the whole space.Using the half-strut element and elastic deflection theory to analyze the mechanical behavior as were adopted in the previous studies,this paper obtained the theoretical expressions for the compressive stress and strain as well as the corresponding curves in the rise and transverse directions.In addition,the theoretical results were examined by the finite element simulation.Results indicated that the theoretical analysis was very close to the finite element simulation when the strain was not too high,which confirmed the validity of theoretical analysis.At the same time,the anisotropy was shown to have a significant effect on the mechanical properties of open-cell foams.As the anisotropy ratio increased,the compressive stress was improved in the rise direction but dropped in the transverse direction under the same strain.By elongating the regular Kelvin model in one direction and keeping unchanged in the other two directions,the anisotropic model was constructed.Then,the simplified periodic structural cell was obtained according to the periodicity and symmetry of the model in the whole space.Using the half-strut element and elastic deflection theory to analyze the mechanical behavior as were adopted in the previous studies,this paper obtained the theoretical expressions for the compressive stress and strain as well as the corresponding curves in the rise and transverse directions.In addition,the theoretical results were examined by the finite element simulation.Results indicated that the theoretical analysis was very close to the finite element simulation when the strain was not too high,which confirmed the validity of theoretical analysis.At the same time,the anisotropy was shown to have a significant effect on the mechanical properties of open-cell foams.As the anisotropy ratio increased,the compressive stress was improved in the rise direction but dropped in the transverse direction under the same strain.

关 键 词：open-cell FOAMS ELASTIC deformation KELVIN model ANISOTROPY finite element 

分 类 号：O344.1[理学—固体力学]