Friction enhances elasticity in granular solids

Abstract

For years, engineers have used elastic and plastic models to describe the properties of granular solids, such as sand piles and grains in silos1,2,3. However, there are theoretical4,5,6 and experimental7,8,9,10,11,12,13,14 results that challenge this approach. Specifically, it has been claimed4,5,6 that stress in granular solids propagates in a manner described by wave-like (hyperbolic) equations, rather than the elliptic equations of static elasticity. Here we report numerical simulations of the response of a two-dimensional granular slab to an external load, revealing that both approaches are valid—albeit on different length scales. For small systems that can be considered mesoscopic on the scale of the grains, a hyperbolic-like, strongly anisotropic response is expected. However, in large systems (those typically considered by engineers), the response is closer to that predicted by traditional isotropic elasticity models. Static friction, often ignored in simple models, plays a key role: it increases the elastic range and renders the response more isotropic, even beyond this range.

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Figure 1: Force distribution and linearity below a lattice of disks.
Figure 2: The changes (the teardrop) in the contact network induced by an applied force, for different values of Fext and µ.
Figure 3: Effects of friction.
Figure 4: Effects of disorder and a phase diagram.

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Acknowledgements

We thank A. P. F. Atman, R. P. Behringer, P. Claudin, E. Clément, J. Geng, N. Mueggenburg, M. van Hecke, W. van Saarloos and T. A. Witten for discussions. This work was supported by the Israel Science Foundation (ISF) and the US-Israel Binational Science Foundation (BSF).

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Correspondence to I. Goldhirsch.

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Goldenberg, C., Goldhirsch, I. Friction enhances elasticity in granular solids. Nature 435, 188–191 (2005). https://doi.org/10.1038/nature03497

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