Compaction processes in granular beds composed of different particle sizes

Lowe, C. A.; Greenaway, M. W.

doi:10.1063/1.2149167

Cited by 19 publications

(11 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…doi:10. /j.ijsolstr.2007 method, or discrete elements, to resolve the dynamics of a variety of heterogeneous or granular materials, including Ti-SiC (Benson et al, 1995b), aluminum (Nieh et al, 1996), copper (Benson, 1995a), alumina (Bourne, 2005), polycrystalline copper (Case and Horie, 2005), polycrystalline iron (Horie and Yano, 2001), plastic-bonded explosives (Milne et al, 2005), steel (Williamson, 1990), Nn-Si , HMX Menikoff, 2001;Lowe and Greenaway, 2005), and sugar (Baer and Trott, 2002).…”

Section: Introductionmentioning

confidence: 98%

Mesoscale calculations of the dynamic behavior of a granular ceramic

Borg

Vogler

2008

International Journal of Solids and Structures

View full text Add to dashboard Cite

Mesoscale calculations have been conducted in order to gain further insight into the dynamic compaction characteristics of granular ceramics. The primary goals of this work are to numerically determine the shock response of granular tungsten carbide and to assess the feasibility of using these results to construct the bulk material Hugoniot. Secondary goals include describing the averaged compaction wave behavior as well as characterizing wave front behavior such as the strain rate versus stress relationship and statistically describing the laterally induced velocity distribution. The mesoscale calculations were able to accurately reproduce the experimentally determined Hugoniot slope but under predicted the zero pressure shock speed by 12%. The averaged compaction wave demonstrated an initial transient stress followed by asymptotic behavior as a function of grain bed distance. The wave front dynamics demonstrate non-Gaussian compaction dynamics in the lateral velocity distribution and a power-law strain rate-stress relationship.

show abstract

Section: Introductionmentioning

confidence: 98%

Mesoscale calculations of the dynamic behavior of a granular ceramic

Borg

Vogler

2008

International Journal of Solids and Structures

View full text Add to dashboard Cite

show abstract

“…This is somewhat problematic because, as remarked by Powers, Stewart & Krier (1990) and much later by Lowe & Greenaway (2005), reliable empirical correlations forν c are not available in the literature. In the absence of any further guidance, we adopt the heuristic analysis of Baer & Nunziato (1986), and assume thatν c can be approximated by a constant.…”

Section: Governing Equationsmentioning

confidence: 94%

Stability of wall bounded, shear flows of dense granular materials: the role of the Couette gap, the wall velocity and the initial concentration

Varsakelis

Papalexandris

2016

J. Fluid Mech.

View full text Add to dashboard Cite

In this paper, the stability of a plane, unidirectional Couette flow of a dense granular material is investigated via the means of a normal mode stability analysis. Our studies are based on a continuum mechanical model for the flows of interest coupled with the constitutive expressions for the normal and the shear stresses of the granular material induced by the µ(I)-rheology. According to our analysis, both the Couette gap and the wall velocity play a destabilizing role in the flows of interest as opposed to the initial concentration that acts as stabilizer. For sufficiently high Couette gaps and wall velocities, unstable modes are recovered. The predicted instability manifests itself through shear-induced dilatancy that, in turn, engenders particle migration and the formation of bulbs, similar to the ones that have been acquired through molecular dynamics simulations.

show abstract

“…The size of the pores formed between the solid grains is directly related to the material density or porosity. Porosity is a function of the mode of packing, particles shape, their arrangement and size distribution (Bear 1972;Lowe and Greenaway 2005). The effect of the density of sand is complex and it can be accounted for by using a suitable model for the acoustical properties of granular media (e.g.…”

Section: Modellingmentioning

confidence: 99%