Letter | Published:

Bio-inspired pneumatic shape-morphing elastomers

Nature Materialsvolume 18pages2428 (2019) | Download Citation

Abstract

Shape-morphing structures are at the core of future applications in aeronautics1, minimally invasive surgery2, tissue engineering3 and smart materials4. However, current engineering technologies, based on inhomogeneous actuation across the thickness of slender structures, are intrinsically limited to one-directional bending5. Here, we describe a strategy where mesostructured elastomer plates undergo fast, controllable and complex shape transformations under applied pressure. Similar to pioneering techniques based on soft hydrogel swelling6,7,8,9,10, these pneumatic shape-morphing elastomers, termed here as ‘baromorphs’, are inspired by the morphogenesis of biological structures11,12,13,14,15. Geometric restrictions are overcome by controlling precisely the local growth rate and direction through a specific network of airways embedded inside the rubber plate. We show how arbitrary three-dimensional shapes can be programmed using an analytic theoretical model, propose a direct geometric solution to the inverse problem, and illustrate the versatility of the technique with a collection of configurations.

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The data supporting the findings of this study are available within the paper and its Supplementary Information files and from the corresponding author upon reasonable request.

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Acknowledgements

This work received support from the Institut Pierre-Gilles de Gennes (Équipement d’excellence, ‘investissements d’avenir’, ANR-10-EQPX-34) and from ANR SMART. The authors thank C. Blanquart for developing the 3D scanning technique and M. Lebihain from the Institut Jean Le Rond d’Alembert for technical support with 3D printing of the moulds.

Author information

Affiliations

  1. Physique et Mécanique des Milieux Hétérogènes (PMMH), ESPCI Paris, PSL University, CNRS, Sorbonne Universités, Université Paris Diderot, Paris, France

    • Emmanuel Siéfert
    • , Etienne Reyssat
    • , José Bico
    •  & Benoît Roman

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Contributions

E.S. and B.R. developed the baromorph concept. E.S. designed and conducted the experiments. E.S., E.R., J.B and B.R. analysed the data. E.S., J.B. and B.R. developed the theoretical model. All authors participated in editing of the manuscript.

Competing interests

The authors declare no competing interests.

Corresponding author

Correspondence to Benoît Roman.

Supplementary information

  1. Supplementary Information

    Supplementary Video Legends 1–10, Supplementary Notes, Supplementary Figures 1–9

  2. Supplementary Video 1

    Dynamical behaviour of a baromorph under inflation and deflation

  3. Supplementary Video 2

    Parallel actuation of three baromorphs with the same design, at different scales

  4. Supplementary Video 3

    Bowl-shaped baromorph fitting a spherical cap

  5. Supplementary Video 4

    Saddle-shaped baromorph

  6. Supplementary Video 5

    Large angle cone with a centred hole

  7. Supplementary Video 6

    A helicoid baromorph

  8. Supplementary Video 7

    Face programmed with the geometric inverse recipe

  9. Supplementary Video 8

    A mask baromorph

  10. Supplementary Video 9

    Actuation of a double layer baromorph

  11. Supplementary Video 10

    Actuation of an isotropic baromorph

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DOI

https://doi.org/10.1038/s41563-018-0219-x

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