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Unifying Impacts in Granular Matter from Quicksand to Cornstarch

Abstract : A sharp transition between liquefaction and transient solidification is observed during impact on a granular suspension depending on the initial packing fraction. We demonstrate, via high-speed pressure measurements and a two-phase modeling, that this transition is controlled by a coupling between the granular pile dilatancy and the interstitial fluid pressure generated by the impact. Our results provide a generic mechanism for explaining the wide variety of impact responses in particulate media, from dry quicksand in powders to impact hardening in shear-thickening suspensions like cornstarch.
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J. John Soundar Jerome, Nicolas Vandenberghe, Yoël Forterre. Unifying Impacts in Granular Matter from Quicksand to Cornstarch. Physical Review Letters, American Physical Society, 2016, 117 (9), ⟨10.1103/PhysRevLett.117.098003⟩. ⟨hal-01431977⟩

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