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On the contact treatment of non-convex particles in the granular element method

Lim, Keng-Wit and Krabbenhoft, Kristian and Andrade, José E. (2014) On the contact treatment of non-convex particles in the granular element method. Computational Particle Mechanics, 1 (3). pp. 257-275. ISSN 2196-4378. doi:10.1007/s40571-014-0019-2.

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We present a new contact algorithm that endows the granular element method [1] with the ability to model non-convex particles using non-uniform rational basis splines. This significant extension allows for the representation of particle morphological features, namely, sphericity and angularity, to their fullest extent, with local contact rolling resistance and interlocking emanating directly from grain geometry. Both particle elasticity and friction at the contact level are treated implicitly and simultaneously, and the contact algorithm is cast into a mathematical programming-based contact dynamics framework. The framework provides the advantages of implicit time integrators (for e.g., stability and larger time steps) and ability to handle both rigid and highly stiff particles. By allowing for particle non-convexity, modeling flexibility is significantly enhanced, to a level that is comparable with isogeometric methods. As such, the transition from image data to particle shapes is greatly streamlined. More importantly, increased macroscopic strength in granular packings comprising of non-convex particles is fully captured. All the above capabilities are achieved under a very modest implementation effort.

Item Type:Article
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Additional Information:© 2014 Springer International Publishing Switzerland. Received: 19 February 2014; Accepted: 20 March 2014; First Online: 13 May 2014.
Subject Keywords:Non-convex particles; Discrete element method; Granular element method; Contact dynamics; NURBS
Issue or Number:3
Record Number:CaltechAUTHORS:20170616-104550749
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Official Citation:Lim, KW., Krabbenhoft, K. & Andrade, J.E. Comp. Part. Mech. (2014) 1: 257. doi:10.1007/s40571-014-0019-2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78276
Deposited By: Tony Diaz
Deposited On:16 Jun 2017 19:09
Last Modified:15 Nov 2021 17:38

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