Abstract
In an ordered particle assembly, the contact forces between particles commonly propagate along certain preferred directions, which lead to a fact that conventional elastic theories can hardly be used to describe its stress response inside particle systems. In this paper, we report a systematical numerical investigation on the response of a two-dimensional composite particle system to an external applied force. We find the existence of soft granular layer can obviously affect propagating paths of main force chains and eventually lead to a transition of macroscopic mechanical response from a hyperbolic-like to elliptic-like feature. In this case, the stiffness ratio plays an important role like the static friction in a mono-disperse particle system. Furthermore, we find that the composited mode also has significant effect on the mechanical response in a composite granular material. These interesting results can serve to inform the design and optimization of engineering construction involving discrete solid materials.
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Acknowledgments
This work was supported by National Natural Sciences Foundations of China (Grant Nos. 11572144, 11502104), Innovative Research Group of the National Natural Science Foundation of China (Grant No. 11421062), and China Postdoctoral Science Foundation (2013M530434, 2014T70943). The authors gratefully acknowledge these supports.
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Wang, D., Du, W. (2017). Elasticity and Mechanical Response of a Composite Particle System Induced by a Vertical Loading. In: Li, X., Feng, Y., Mustoe, G. (eds) Proceedings of the 7th International Conference on Discrete Element Methods. DEM 2016. Springer Proceedings in Physics, vol 188. Springer, Singapore. https://doi.org/10.1007/978-981-10-1926-5_45
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DOI: https://doi.org/10.1007/978-981-10-1926-5_45
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