The Preparation of Auxetic Foams by Three-Dimensional Printing and Their Characteristics

Authors

  • Richard Critchley,

    1. National Centre for Advanced Tribology at Southampton (nCATS), Engineering Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
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  • Ilaria Corni,

    1. National Centre for Advanced Tribology at Southampton (nCATS), Engineering Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
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  • Julian A. Wharton,

    Corresponding author
    • National Centre for Advanced Tribology at Southampton (nCATS), Engineering Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
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  • Frank C. Walsh,

    1. National Centre for Advanced Tribology at Southampton (nCATS), Engineering Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
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  • Robert J. K. Wood,

    1. National Centre for Advanced Tribology at Southampton (nCATS), Engineering Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
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  • Keith R. Stokes

    1. National Centre for Advanced Tribology at Southampton (nCATS), Engineering Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
    2. Physical Sciences Department, Defence Science and Technology Laboratory (Dstl), Porton Down, Salisbury, Wiltshire, SP4 0JQ, UK
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  • The authors would like to thank the Electronics and Computer Science technical support staff (Ken Frampton, Tony Gardner, Mark Long, and Eric Webb) at the University of Southampton for the training and assistance in producing the printed foam samples and Hayley Essex from the Palaeoecology Laboratory, Geography and Environment of the University of Southampton for the help with the SEM imaging. The authors are also grateful to the Defence Science and Technology Laboratory (Dstl) and the Engineering and Physical Sciences Research Council (EPSRC) for financial support (EP/G042195/1).

Abstract

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Repeatable auxetic foams are produced using three-dimensional printing technologies. This methodology is applied here for the first time to produce playable polymeric auxetic foams with an idealized re-entrant cellular structure. During uniaxial tensile stress, the foams show negative Poisson's ratios as low as −1.18. The experimental Poisson's ratios of the auxetic foams are compared against the data predicted by a three-dimensional mathematical model.

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