Stiffness and energy dissipation in polyurethane auxetic foams
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Auxetic open cell polyurethane (PU) foams have been manufactured and mechanically characterised under cyclic tensile loading. The classical manufacturing process for auxetic PU foams involves multiaxial compression of the conventional parent foam, and heating of the compressed specimens above the Tm of the foam polymer. Eighty cylindrical specimens were fabricated using manufacturing routes modified from those in the open literature, with different temperatures (135 °C, 150 °C), compression ratios and different cooling methods (water or room temperature exposure). Compressive tensile cyclic loading has been applied to measure tangent modulus, Poisson’s ratios and energy dissipated per unit volume. The results are used to obtain relations between manufacturing parameters, mechanical and hysteresis properties of the foams. Compression, both radial and axial, was found to be the most significant manufacturing parameter for the auxetic foams in this work.
KeywordsFoam Tangent Modulus Initial Diameter Linear Little Square Open Cell Foam
The authors wish to express their gratitude to the anonymous reviewers for their useful comments.
- 9.Abdel-Sayed FK, Jones R, Burgens IW (1979) Composites 10:279Google Scholar
- 16.Chen CP, Lakes RS (1989) Cell Polym 8(5):343Google Scholar
- 17.Lakes RS (1992) Cell Polym 11:466Google Scholar
- 25.Lakes RS (1998) Viscoelastic solids. CRC Press, Boca Raton, FLGoogle Scholar
- 27.Taylor JR (1997) An introduction to error analysis, 2nd edn. University Science Books, Sausolito, pp 166–168Google Scholar
- 28.Smith CW, Lehman F, Wootton RJ, Evans KE (1999) Cell Polym 18(2):79Google Scholar