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  • Letter
  • Open Access

Additional jamming transition in two-dimensional bidisperse granular packings

Juan C. Petit1 and Matthias Sperl1,2

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Phys. Rev. Research 7, L022073 – Published 20 June, 2025

DOI: https://doi.org/10.1103/mtcv-dbpd

Abstract

We present a jamming diagram for two-dimensional bidisperse granular systems, capturing two distinct jamming transitions. The first occurs as large particles form a jammed structure, while the second, emerging at a critical small-particle concentration, XS*≈0.21, and size ratio, δ*≈0.25, involves small particles jamming into the voids of the existing large-particle structure upon further compression. Below this threshold, small particles fill voids within the large-particle network, increasing packing density. Beyond this point, excess small particles disrupt efficient packing, resulting in looser structures. These results, consistent with previous three-dimensional studies, demonstrate that the second transition occurs at a well-defined point in the (XS,δ) plane, independent of dimensionality, likely driven by the geometric saturation of available space around particles, void closure, and structural arrangement.

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Phys. Rev. Research 7, L022073– Published 20 June, 2025
  • Received 24 February 2025
  • Accepted 16 May 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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