Grain image


Granular Matter

The jamming that occurs in loose assemblies of repulsive particles, such as disordered packings of disks or grains, has been extensively studied in the context of increasing density. At low densities, few of the particles are touching each other, and the system acts like a fluid with no shear modulus. At high densities, the system gains a shear modulus and acts like a solid in a state that is termed "jammed." Unlike solidification, jamming can occur without the development of long range order or crystallization. Jamming has attracted tremendous interest recently as a possible unifying theme for understanding diverse aspects of granular matter, glassy materials, colloids, emulsions, and many other systems where collective interactions among constitutive particles are important. We explore the response of granular systems to a local perturbation in the form of a dragged grain near the jamming transition, and study the effect of quenched disorder in the form of pinning sites or obstacles on the jamming behavior. We find evidence that in addition to a jamming transition, there can be a distinct clogging transition at lower densities when quenched disorder is present.

Preprints:

  1. Reversible, irreversible and mixed regimes for periodically driven disks in random obstacle arrays
    D. Minogue, M.R. Eskildsen, C. Reichhardt, and C.J.O. Reichhardt
    arXiv

    We examine an assembly of repulsive disks interacting with a random obstacle array under a periodic drive, and find a transition from reversible to irreversible dynamics as a function of drive amplitude or disk density. At low densities and drives, the system rapidly forms a reversible state where the disks return to their exact positions at the end of each cycle. In contrast, at high amplitudes or high densities, the system enters an irreversible state where the disks exhibit normal diffusion. Between these two regimes, there can be a glassy irreversible state where most of the system is reversible, but localized irreversible regions are present that are prevented from spreading through the system due to a screening effect from the obstacles. We also find states that we term combinatorial reversible states in which the disks return to their original positions after multiple driving cycles. In these states, individual disks exchange positions but form the same configurations during the subcycles of the larger reversible cycle.

Papers:

  1. Reversible to irreversible transitions for cyclically driven disks on periodic obstacle arrays
    C. Reichhardt and C.J.O. Reichhardt
    J. Chem. Phys. 156, 124901 (2022). arXiv


  2. Directional clogging and phase separation for disk flow through periodic and diluted obstacle arrays
    C. Reichhardt and C.J.O. Reichhardt
    Soft Matter 17, 1548 (2021). arXiv


  3. Collective effects and pattern formation for directional locking of disks moving through obstacle arrays
    C. Reichhardt and C.J.O. Reichhardt
    Phys. Rev. E 102, 022608 (2020). arXiv


  4. Jamming, fragility and pinning phenomena in superconducting vortex systems
    C. Reichhardt and C.J.O. Reichhardt
    Sci. Rep. 10, 11625 (2020). arXiv


  5. Detecting depinning and nonequilibrium transitions with unsupervised machine learning
    D. McDermott, C.J.O. Reichhardt, and C. Reichhardt
    Phys. Rev. E 101, 042101 (2020). arXiv


  6. Dynamic phases, stratification, laning, and pattern formation for driven bidisperse disk systems in the presence of quenched disorder
     D. McDermott, Y. Yang, C.J.O. Reichhardt, and C. Reichhardt
    Phys. Rev. E 99, 042601 (2019). arXiv


  7. Controlled fluidization, mobility and clogging in obstacle arrays using periodic perturbations
    C. Reichhardt and C.J.O. Reichhardt
    Phys. Rev. Lett. 121, 068001 (2018). arXiv


  8. Crossover from clogging to jamming behaviors in heterogeneous environments
     H. Peter, A. Libal, C. Reichhardt, and C.J.O. Reichhardt
    Sci. Rep. 8, 10252 (2018). arXiv


  9. Clogging and transport of driven particles in asymmetric funnel arrays
     C.J.O. Reichhardt and C. Reichhardt,
    J. Phys.: Condens. Matter 30, 244005 (2018). arXiv


  10. Velocity force curves, laning, and jamming for oppositely driven disk systems
    C. Reichhardt and C.J.O. Reichhardt,
    Soft Matter 14, 490 (2018). arXiv


  11. Dynamic phases, clustering, and lane formation for driven disk systems in the presence of quenched disorder
    Y. Yang, D. McDermott, C.J. Olson Reichhardt, and C. Reichhardt,
    Phys. Rev. E 95, 042902 (2017). arXiv


  12. Clogging and jamming transitions in periodic obstacle arrays
    H.T. Nguyen, C. Reichhardt, and C.J. Olson Reichhardt,
    Phys. Rev. E Rapid Communications 95, 030902(R) (2017). arXiv


  13. Softening of stressed granular packings with resonant sound waves
    C.J. Olson Reichhardt, L.M. Lopatina, X. Jia, and P.A. Johnson,
    Phys. Rev. E 92, 022203 (2015). arXiv


  14. Aspects of jamming in two-dimensional athermal frictionless systems (invited review article)
    C. Reichhardt and C.J. Olson Reichhardt,
    Soft Matter 10, 2932 (2014). arXiv


  15. Connecting jamming and depinning transitions
    C. Reichhardt, Z. Nussinov, and C.J. Olson Reichhardt,
    AIP Conf. Proc. 1512, 7 (2013).


  16. Jamming in systems with quenched disorder
    C.J. Olson Reichhardt, E. Groopman, Z. Nussinov, and C. Reichhardt,
    Phys. Rev. E 86, 061301 (2012). arXiv


  17. Jamming in granular polymers
    L.M. Lopatina, C.J. Olson Reichhardt, and C. Reichhardt,
    Phys. Rev. E 84, 011303 (2011). arXiv


  18. Fluctuations, jamming, and yielding for a driven probe particle in disordered disk assemblies
    C.J. Olson Reichhardt and C. Reichhardt,
    Phys. Rev. E 82, 051306 (2010). arXiv


  19. A ball-and-chain polymer model
    C.J. Olson Reichhardt and L.M. Lopatina,
    Science 326, 374 (2009).


  20. Multiscaling at point J: Jamming is a critical phenomenon
    J.A. Drocco, M.B. Hastings, C.J. Olson Reichhardt, and C. Reichhardt
    Phys. Rev. Lett. 95, 088001 (2005). arXiv


  21. Ratchet-induced segregation and transport of non-spherical grains
    J.F. Wambaugh, C. Reichhardt, and C.J. Olson
    Phys. Rev. E 65, 031308 (2002). arXiv


  22. Effect of grain anisotropy on ordering, stability, and dynamics in granular systems
    C.J. Olson, C. Reichhardt, M. McCloskey, and R.J. Zieve
    Europhys. Lett. 57, 904 (2002). arXiv

Last modified April 6, 2018