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

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 us...

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Bibliographic Details
Published inNature communications Vol. 7; no. 1; pp. 12243 - 8
Main Authors Han, Endao, Peters, Ivo R., Jaeger, Heinrich M.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 20.07.2016
Nature Publishing Group
Nature Portfolio
Subjects
631/1647/245/1859
639/301/119
639/766/189
Anisotropy
Driving ability
Humanities and Social Sciences
Investigations
multidisciplinary
Propagation
Science
Science (multidisciplinary)
Solidification
Solids
Ultrasonic imaging
Velocity
United States > US
Illinois
Chicago Illinois
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Summary: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. Suspensions of particles at high volume fractions are subject to discontinuous shear thickening or even turn into solid upon impact, yet the underlying mechanism remains elusive. Here, Han et al . follow the propagation of shear bands at jamming fronts in three dimensions and show no sign of densification.
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ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms12243