Empirically Based Gamma-Distributed Random Wall Pressure Field in Silo

Ditlevsen, Ove; Berntsen, K. Nikolaj

doi:10.1061/(asce)0733-9399(1999)125:5(561)

Cited by 4 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The saturation of the stress profile thus takes place over a larger distance from the top surface. Some models tentatively assume a random mobilization of the friction forces at the wall to describe this effect [41]. In a simplified Janssen's picture this would be equivalent to a large value of the screening length λ, meaning that the wall bears less load than expected in the case of a full friction mobilization.…”

mentioning

confidence: 99%

Silo Collapse under Granular Discharge

et al. 2015

View full text Add to dashboard Cite

We investigate, at a laboratory scale, the collapse of cylindrical shells of radius R and thickness t induced by a granular discharge. We measure the critical filling height for which the structure fails upon discharge. We observe that the silos sustain filling heights significantly above an estimation obtained by coupling standard shell-buckling and granular stress distribution theories. Two effects contribute to stabilize the structure: (i) below the critical filling height, a dynamical stabilization due to granular wall friction prevents the localized shell-buckling modes to grow irreversibly; (ii) above the critical filling height, collapse occurs before the downward sliding motion of the whole granular column sets in, such that only a partial friction mobilization is at play. However, we notice also that the critical filling height is reduced as the grain size d increases. The importance of grain size contribution is controlled by the ratio d= ffiffiffiffiffi Rt p . We rationalize these antagonist effects with a novel fluid-structure theory both accounting for the actual status of granular friction at the wall and the inherent shell imperfections mediated by the grains. This theory yields new scaling predictions which are compared with the experimental results.

show abstract

mentioning

confidence: 99%

Silo Collapse under Granular Discharge

et al. 2015

View full text Add to dashboard Cite

show abstract

“…This result contrasts with what was obtained for non-cohesive elongated particles. In that case, the topology of the packing is dominated by the face to face interaction and the formation of ordered structures of aligned rods is detected [47,23]. For better describing the packing structure, in Fig2a we present the density profiles depending on depth y/y max obtained for several deposits of elongated particles.…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Granular packings of cohesive elongated particles

et al. 2011

View full text Add to dashboard Cite

We report numerical results of effective attractive forces on the packing properties of two-dimensional elongated grains. In deposits of non-cohesive rods in 2D, the topology of the packing is mainly dominated by the formation of ordered structures of aligned rods. Elongated particles tend to align horizontally and the stress is mainly transmitted from top to bottom, revealing an asymmetric distribution of local stress. However, for deposits of cohesive particles, the preferred horizontal orientation disappears. Very elongated particles with strong attractive forces form extremely loose structures, characterized by an orientation distribution, which tends to a uniform behavior when increasing the Bond number. As a result of these changes, the pressure distribution in the deposits changes qualitatively. The isotropic part of the local stress is notably enhanced with respect to the deviatoric part, which is related to the gravity direction. Consequently, the lateral stress transmission is dominated by the enhanced disorder and leads to a faster pressure saturation with depth.

show abstract

Preface

Krenk¹,

Friis-Hansen²

2008

Probabilistic Engineering Mechanics

View full text Add to dashboard Cite

Empirically Based Gamma-Distributed Random Wall Pressure Field in Silo

Cited by 4 publications

References 5 publications

Silo Collapse under Granular Discharge

Silo Collapse under Granular Discharge

Granular packings of cohesive elongated particles

Preface

Contact Info

Product

Resources

About