Microstructure evolution during impact on granular matter

L. Kondic, X. Fang, W. Losert, C. S. O'Hern, and R. P. Behringer
Phys. Rev. E 85, 011305 – Published 18 January 2012
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Abstract

We study the impact of an intruder on a dense granular material. The process of impact and interaction between the intruder and the granular particles is modeled using discrete element simulations in two spatial dimensions. In the first part of the paper we discuss how the intruder's dynamics depends on (1) the intruder's properties, including its size, shape and composition, (2) the properties of the grains, including friction, polydispersity, structural order, and elasticity, and (3) the properties of the system, including its size and gravitational field. It is found that polydispersity and related structural order, and frictional properties of the granular particles, play a crucial role in determining impact dynamics. In the second part of the paper we consider the response of the granular system itself. We discuss the force networks that develop, including their topological evolution. The influence of friction and structural order on force propagation, including the transition from hyperbolic-like to elastic-like behavior is discussed, as well as the affine and nonaffine components of the grain dynamics. Several broad observations include the following: tangential forces between granular particles are found to play a crucial role in determining impact dynamics; both force networks and particle dynamics are correlated with the dynamics of the intruder itself.

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  • Received 28 August 2011

DOI:https://doi.org/10.1103/PhysRevE.85.011305

©2012 American Physical Society

Authors & Affiliations

L. Kondic1, X. Fang1, W. Losert2, C. S. O'Hern3, and R. P. Behringer4

  • 1Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
  • 2Department of Physics, IPST, and IREAP, University of Maryland, College Park, Maryland 20742, USA
  • 3Departments of Mechanical Engineering & Materials Science and Physics, Yale University, New Haven, Connecticut 06520-8284, USA
  • 4Department of Physics and Center for Nonlinear and Complex Systems, Duke University, Durham, North Carolina 27708-0305, USA

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Issue

Vol. 85, Iss. 1 — January 2012

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