The contact force model is very important to describe the grain collision process accurately. In this research, the linear/nonlinear contact force models and normal coefficient of restitution in different impact velocities has been studied. A new contact force model for describing the normal collision between two visco-elastic spherical particles has been suggested and the ability of this new model in predicting the correct behavior of normal contact has been confirmed. The constitutive equations of this model have been solved numerically and the result shows a better conformity with experimental result reported by Bridge et al. [1] than the previous models, such as the model presented by Brilliantov et al. [2]. By using the suitable finite elements model, the stress and deformation of particles during the collision has been obtained and the result of the finite elements model shows a good conformity with our new suggested contact force model in the case of elastic and visco-elastic contact. The behavior of normal coefficient of restitution in multisize spherical particles in different impact velocities and effect of the size on it has been experimentally studied. In addition to our more suitable contact force model, we achieved some nice conclusions from our experimental data about the loss of energy during the multisize collision and effect of size difference on this loss.
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ASME 8th Biennial Conference on Engineering Systems Design and Analysis
July 4–7, 2006
Torino, Italy
ISBN:
0-7918-4250-9
PROCEEDINGS PAPER
A Realistic Model for Visco-Elastic Contact Between Spherical Particles
Mohammad Hadi Bordbar
,
Mohammad Hadi Bordbar
Lappeenranta University of Technology, Lappeenranta, Finland
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Timo Hyppanen
Timo Hyppanen
Lappeenranta University of Technology, Lappeenranta, Finland
Search for other works by this author on:
Mohammad Hadi Bordbar
Lappeenranta University of Technology, Lappeenranta, Finland
Timo Hyppanen
Lappeenranta University of Technology, Lappeenranta, Finland
Paper No:
ESDA2006-95344, pp. 253-262; 10 pages
Published Online:
September 5, 2008
Citation
Bordbar, MH, & Hyppanen, T. "A Realistic Model for Visco-Elastic Contact Between Spherical Particles." Proceedings of the ASME 8th Biennial Conference on Engineering Systems Design and Analysis. Volume 3: Dynamic Systems and Controls, Symposium on Design and Analysis of Advanced Structures, and Tribology. Torino, Italy. July 4–7, 2006. pp. 253-262. ASME. https://doi.org/10.1115/ESDA2006-95344
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