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Strain rate dependence of stiffness and Poisson's ratio of auxetic open cell PU foams
Author(s) -
Pastorino P.,
Scarpa F.,
Patsias S.,
Yates J. R.,
Haake S. J.,
Ruzzene M.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200572714
Subject(s) - auxetics , materials science , poisson's ratio , composite material , poisson distribution , ultimate tensile strength , strain rate , polyurethane , strain (injury) , stiffness , polyester , digital image correlation , cushioning , thermoplastic polyurethane , stiffening , tension (geology) , thermoplastic , mathematics , elastomer , medicine , statistics
The paper describes the manufacturing and tensile testing of auxetic (negative Poisson's ratio) thermoplastic polyurethane and polyester urethane foams, under quasi‐static and constant strain rate loading. The foams are produced from conventional flexible polyurethane basis following a manufacturing route developed in previous works. The Poisson's ratio behaviour over compressive strain has been analyzed using an Image Data processing technique based on Edge Detection from digital images recorded using camcorders and high speed cameras. The measurements indicate that higher strain rate loading implies stiffening effects on the stress–strain curves, and significant increase of the magnitudes of the Poisson's ratios with increasing compressive strains. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)