Document Detail

Particle shape effects on the stress response of granular packings.
MedLine Citation:
PMID:  24651965     Owner:  NLM     Status:  In-Data-Review    
We present measurements of the stress response of packings formed from a wide range of particle shapes. Besides spheres these include convex shapes such as the Platonic solids, truncated tetrahedra, and triangular bipyramids, as well as more complex, non-convex geometries such as hexapods with various arm lengths, dolos, and tetrahedral frames. All particles were 3D-printed in hard resin. Well-defined initial packing states were established through preconditioning by cyclic loading under given confinement pressure. Starting from such initial states, stress-strain relationships for axial compression were obtained at four different confining pressures for each particle type. While confining pressure has the largest overall effect on the mechanical response, we find that particle shape controls the details of the stress-strain curves and can be used to tune packing stiffness and yielding. By correlating the experimentally measured values for the effective Young's modulus under compression, yield stress and energy loss during cyclic loading, we identify trends among the various shapes that allow for designing a packing's aggregate behavior.
Athanasios G Athanassiadis; Marc Z Miskin; Paul Kaplan; Nicholas Rodenberg; Seung Hwan Lee; Jason Merritt; Eric Brown; John Amend; Hod Lipson; Heinrich M Jaeger
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Soft matter     Volume:  10     ISSN:  1744-6848     ISO Abbreviation:  Soft Matter     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2014-03-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101295070     Medline TA:  Soft Matter     Country:  England    
Other Details:
Languages:  eng     Pagination:  48-59     Citation Subset:  IM    
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