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

TL;DR

This study explores how different inter-particle potentials influence aggregate collision fragmentation, revealing universal behaviors and introducing a new fragmentation metric through extensive molecular dynamics simulations.

Contribution

It provides a comprehensive analysis of collision fragmentation across various interaction potentials and introduces the shattering degree as a universal fragmentation measure.

Findings

Power-law size distribution of fragments observed for all potentials

Universal behavior of the shattering degree $S$ across potentials

Construction of a collision phase diagram based on impact classification

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.