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arXiv · 2110.06706

Collision fragmentation of aggregates. The role of the interaction potential between comprising particles

Alexander Osinsky·Nikolai Brilliantov
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Abstract

We investigate disruptive collisions of aggregates comprised of particles with different interaction potentials. We study Lennard-Jones (L-J), Tersoff, modified L-J potential and the one associated with Johnson-Kendall-Roberts (JKR) model. These refer to short, middle and long-ranged inter-particle potentials and describe both inter-atomic interactions and interactions of macroscopic adhesive bodies. We perform comprehensive molecular dynamics simulations and observe for all four potentials power-law dependencies for the size distribution of collision fragments and for their size-velocity correlation. We introduce a new fragmentation characteristic -- the shattering degree $S$, quantifying the fraction of monomers in debris and reveal its universal behavior. Namely, we demonstrate that for all potentials, $1-S$ is described by a universal function of the impact velocity. Using the above results, we perform the impact classification and construct the respective collision phase diagram. Finally, we present a qualitative theory that explains the observed scaling behavior.

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Alexander Osinsky, Nikolai Brilliantov. 2021-10-13. Collision fragmentation of aggregates. The role of the interaction potential between comprising particles. https://doi.org/10.1016/j.physa.2022.127785

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