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An Electro-Mechanical Contact Model for Particulate Systems

Lookup NU author(s): Chao Zhang, Dr Sadaf MaramizonouzORCiD, Dr David MilledgeORCiD, Dr Sadegh NadimiORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

This study presents an electro-mechanical contact model to investigate the electrical response within a particulate system under mechanical loading. The model considers the electrical resistance across particle-to-particle and particle-to-wall contacts by formulating bulk and contact resistances, separately. Hertz and Holm's models are utilised for the contact resistance in the overlapping region. The bulk resistance for the particles is estimated considering particle geometry transformations during the compression. The proposed electro-mechanical contact model is verified and validated against published analytical solutions and experimental data. Finally, the contact model is applied to simulate a high-pressure torsion test to investigate the influence of three different materials on the electrical conduction properties of the system after particle fragmentation. The intensity distributions of electric potential, current and resistance of the granular system are analysed at both particle and system scales. An electroactivity index is proposed for evaluating the contribution of each fragment sieve cut on the bulk electrical conduction behaviour.

Publication metadata

Author(s): Zhang C, Maramizonouz S, Milledge D, Nadimi S

Publication type: Article

Publication status: Published

Journal: Powder Technology

Year: 2024

Pages: Epub ahead of print

Online publication date: 11/04/2024

Acceptance date: 09/04/2024

Date deposited: 12/04/2024

ISSN (print): 0032-5910

ISSN (electronic): 1873-328X

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.powtec.2024.119759

DOI: 10.1016/j.powtec.2024.119759

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