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High-speed ultrasound imaging in dense suspensions reveals impact-activated solidification due to dynamic shear jamming

Author

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  • Endao Han

    (James Franck Institute, The University of Chicago
    The University of Chicago)

  • Ivo R. Peters

    (James Franck Institute, The University of Chicago
    Engineering and the Environment, University of Southampton)

  • Heinrich M. Jaeger

    (James Franck Institute, The University of Chicago
    The University of Chicago)

Abstract

A remarkable property of dense suspensions is that they can transform from liquid-like at rest to solid-like under sudden impact. Previous work showed that this impact-induced solidification involves rapidly moving jamming fronts; however, details of this process have remained unresolved. Here we use high-speed ultrasound imaging to probe non-invasively how the interior of a dense suspension responds to impact. Measuring the speed of sound we demonstrate that the solidification proceeds without a detectable increase in packing fraction, and imaging the evolving flow field we find that the shear intensity is maximized right at the jamming front. Taken together, this provides direct experimental evidence for jamming by shear, rather than densification, as driving the transformation to solid-like behaviour. On the basis of these findings we propose a new model to explain the anisotropy in the propagation speed of the fronts and delineate the onset conditions for dynamic shear jamming in suspensions.

Suggested Citation

  • Endao Han & Ivo R. Peters & Heinrich M. Jaeger, 2016. "High-speed ultrasound imaging in dense suspensions reveals impact-activated solidification due to dynamic shear jamming," Nature Communications, Nature, vol. 7(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12243
    DOI: 10.1038/ncomms12243
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