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      Persistence of force networks in compressed granular media

      , , ,
      Physical Review E
      American Physical Society (APS)

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          Bimodal Character of Stress Transmission in Granular Packings

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            Characterization of force chains in granular material

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              Friction enhances elasticity in granular solids

              For years, engineers have used elastic and plastic models to describe the properties of granular solids, such as sand piles and grains in silos. However, there are theoretical and experimental results that challenge this approach. Specifically, it has been claimed 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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                Author and article information

                Journal
                PLEEE8
                Physical Review E
                Phys. Rev. E
                American Physical Society (APS)
                1539-3755
                1550-2376
                April 2013
                April 22 2013
                : 87
                : 4
                Article
                10.1103/PhysRevE.87.042207
                23679407
                b6862493-c9b6-4070-b17b-97643b8b03f0
                © 2013

                http://link.aps.org/licenses/aps-default-license

                http://link.aps.org/licenses/aps-default-accepted-manuscript-license

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