NDLI: Mechanical properties of non-cohesive polygonal particle aggregates

Content Provider	Springer Nature Link
Author	Roul, Pradip Schinner, Alexander Kassner, Klaus
Copyright Year	2010
Abstract	We numerically investigate the effective material properties of aggregates consisting of soft convex polygonal particles, using the discrete element method. First, we construct two types of “sand piles” by two different procedures. Then we measure the averaged stress and strain, the latter via imposing a 10% reduction of gravity, as well as the fabric tensor. Furthermore, we compare the vertical normal strain tensor between sand piles qualitatively and show how the construction history of the piles affects their strain distribution as well as the stress distribution. In the next step, elastic constants are determined, assuming Hooke’s law to be locally valid throughout the sand piles. We determine the relationship between invariants of the stress and strain tensor, observing that the behaviour is nonlinear. While linear elastic behaviour near the centre of the pile is compatible with our data, nonlinearity signals the transition to plastic behaviour near its surface. A similar behaviour was assumed by Cantelaube et al. (Static multiplicity of stress states in granular heaps. Proc R Soc Lond A 456:2569–2588, 2000). We find that the macroscopic stress and fabric tensors are not collinear in the sand pile and that the elastic behaviour is anisotropic in an essential way.
Starting Page	303
Ending Page	317
Page Count	15
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	13
Issue Number	4
e-ISSN	14347636
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sand pile Stress Strain Fabric Discrete element method Industrial Chemistry/Chemical Engineering Materials Science Engineering Thermodynamics, Heat and Mass Transfer Engineering Fluid Dynamics Geoengineering, Foundations, Hydraulics Soft and Granular Matter, Complex Fluids and Microfluidics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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