期刊
ACTA MATERIALIA
卷 48, 期 17, 页码 4349-4356出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-6454(00)00269-X
关键词
foams; elastic; theory & modeling; mesostructure; Poisson's ratio
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.
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