NDLI: Micromechanical origin of angle of repose in granular materials

Content Provider	Springer Nature Link
Author	Dai, Bei Bing Yang, Jun Zhou, Cui Ying
Copyright Year	2017
Abstract	We present in this paper a numerical study of sandpile formation and angle of repose by considering the effect of particle shape. We analyze the micromechanical responses of sandpiles, which are crucial to the exploration of origin of angle of repose. The results show that the principal anisotropy directions of contact orientations for the left and right parts of sandpiles deviate increasingly away from the vertical direction as the particle shape becomes more irregular, and that the summation of their deviation angle $$\Delta \phi _n$$ relative to the vertical direction with angle of repose $$\alpha $$ , is approximately a constant regardless of the effect of particle shape. We find that the principal anisotropy directions of particle orientations for the left and right parts of sandpiles rotate as the irregularity of particle shape varies, and tend to reach a compromise state and to lie in the common horizontal direction at a characteristic aspect ratio AR = 0.6. We reveal that the mobilization of arching effect depends primarily on the inclined propagation of strong force chains. We also establish a relationship between the direction where the most intense arching phenomenon takes place and the principal anisotropy directions characterizing the distribution of microstructures and inter-particle force network.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	19
Issue Number	2
e-ISSN	14347636
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-03-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Angle of repose Particle shape Discrete element method Arching Force chain Fabric anisotropy Soft and Granular Matter, Complex Fluids and Microfluidics Engineering Fluid Dynamics Materials Science Geoengineering, Foundations, Hydraulics Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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