Open AccessGrain-based characterisation and acoustic wave propagation in a sand packing subject to triaxial compression
Author(s) -
Mohammad Saadatfar,
Nicolas François,
Alon Arad,
Mahyar Madadi,
Adrian Sheppard,
Tim J. Senden,
Mark Knackstedt
Publication year - 2013
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.4811995
Subject(s) - anisotropy , materials science , dissipation , deformation (meteorology) , stress (linguistics) , compression (physics) , particle (ecology) , scale (ratio) , tracking (education) , finite element method , orientation (vector space) , geotechnical engineering , mechanics , composite material , geology , optics , geometry , structural engineering , physics , engineering , mathematics , psychology , pedagogy , linguistics , philosophy , oceanography , quantum mechanics , thermodynamics
This paper presents a study of 3D deformation process in a dry packing of Ottawa sand. X-ray microtomography is used to acquire scans of a triaxial test of the sample at five axial stress levels. Using 3D image analysis we are able to resolve particle scale features. Particle tracking combined with finite element simulations reveal that the rotational transformation of particles is one of the primary mechanisms of elastic energy dissipation at the grain scale. By analysing grain contact orientation, we show that stress induced anisotropy is spatially correlated to the compressional elastic wave.
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