Elsevier

Powder Technology

Volume 282, September 2015, Pages 2-9
Powder Technology

An accurate force–displacement law for the modelling of elastic–plastic contacts in discrete element simulations

https://doi.org/10.1016/j.powtec.2014.12.055Get rights and content
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Highlights

  • Contact between elastic–plastic sphere and rigid surface studied using FEM

  • Detailed analysis used to develop new model for use in discrete element simulations

  • New model implemented and validated in DEM code

  • Parameters of new model are directly related to material properties.

Abstract

This paper presents an accurate model for the normal force–displacement relationship between elastic–plastic spheres in contact for use in discrete element method (DEM) simulations. The model has been developed by analysing the normal force–displacement relationship between an elastic–perfectly plastic sphere and a rigid surface using the finite element method (FEM). Empirical relationships are found that relate the parameters of the new model to material properties. This allows the model to be used in the DEM for direct simulation of well characterised elastic–plastic materials without fitting parameters to experimental results. This gives the model an advantage over models in the literature for which fitting to experimental results is required. The implementation of the model into an existing DEM code is discussed and validated against the results from FEM simulations. The new model shows a good match to the FEM results and the DEM implementation correctly distinguishes between the loading, unloading and re-loading phases of contact between two spheres.

Graphical abstract

By using finite element simulations an accurate model for the normal force–displacement relationship between elastic–plastic spheres for use in discrete element method (DEM) simulations has been developed. The model has been implemented into an existing DEM code and is validated against the results from finite element simulations.

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Keywords

Discrete element method
Elastic–plastic
Force–displacement
Contact models

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