Stiffness and energy dissipation in polyurethane auxetic foams |
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Authors: | Matteo Bianchi Fabrizio L Scarpa Christopher W Smith |
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Affiliation: | (1) Department of Aerospace Engineering, University of Bristol, Queens Building, BS8 1TR Bristol, UK;(2) School of Engineering, Computing and Mathematics, University of Exeter, North Park Road, EX4 4QF Exeter, UK |
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Abstract: | 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. |
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