A novel mechanism for generating auxetic behaviour in reticulated foams: Missing rib foam model

被引:358
作者
Smith, CW [1 ]
Grima, JN [1 ]
Evans, KE [1 ]
机构
[1] Univ Exeter, Sch Engn & Comp Sci, Exeter EX4 4QF, Devon, England
基金
英国生物技术与生命科学研究理事会;
关键词
foams; elastic; theory & modeling; mesostructure; Poisson's ratio;
D O I
10.1016/S1359-6454(00)00269-X
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Foams have previously been fabricated with a negative Poisson's ratio (termed auxetic foams). A novel model is proposed to explain this and to describe the strain-dependent Poisson's function behaviour of honeycomb and foam materials. The model is two-dimensional and is based upon the observation of broken cell ribs in foams processed via the compression and heating technique usually employed to convert conventional foams to auxetic behaviour. The model has two forms: the "intact" form is a network of ribs with biaxial symmetry, and the "auxetic" form is a similar network but with a proportion of cell ribs removed. The model output is compared with that of an existing two-dimensional model and experimental data, and is found to be superior in predicting the Poisson's function and marginally better at predicting the stress-strain behaviour of the experimental data than the existing model, using realistic values for geometric parameters. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd All rights reserved.
引用
收藏
页码:4349 / 4356
页数:8
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