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Random auxetics from buckling fibre networks

Author

Listed:
  • S. Domaschke

    (Swiss Federal Laboratories for Materials Science and Technology, Experimental Continuum Mechanics
    Institute for Mechanical Systems)

  • A. Morel

    (Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles)

  • G. Fortunato

    (Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles)

  • A. E. Ehret

    (Swiss Federal Laboratories for Materials Science and Technology, Experimental Continuum Mechanics
    Institute for Mechanical Systems)

Abstract

Auxetic materials have gained increasing interest in the last decades, fostered by auspicious applications in various fields. While the design of new auxetics has largely focused on meta-materials with deterministic, periodically arranged structures, we show here by theoretical and numerical analysis that pronounced auxetic behaviour with negative Poisson’s ratios of very large magnitude can occur in random fibre networks with slender, reasonably straight fibre segments that buckle and deflect. We further demonstrate in experiments that such auxetic fibre networks, which increase their thickness by an order of magnitude and more than quintuple their volume when moderately extended, can be produced by electrospinning. Our results thus augment the class of auxetics by a large group of straightforwardly fabricable meta-materials with stochastic microstructure.

Suggested Citation

  • S. Domaschke & A. Morel & G. Fortunato & A. E. Ehret, 2019. "Random auxetics from buckling fibre networks," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12757-7
    DOI: 10.1038/s41467-019-12757-7
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