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Multiscale characterization and modeling of granular materials through a computational mechanics avatar: a case study with experiment

Lim, Keng-Wit and Kawamoto, Reid and Andò, Edward and Viggiani, Gioacchino and Andrade, José E. (2016) Multiscale characterization and modeling of granular materials through a computational mechanics avatar: a case study with experiment. Acta Geotechnica, 11 (2). pp. 243-253. ISSN 1861-1125.

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Through a first-generation computational mechanics avatar that directly links advanced X-ray computed tomographic experimental techniques to a discrete computational model, we present a case study where we made the first attempt to characterize and model the grain-scale response inside the shear band of a real specimen of Caicos ooids subjected to triaxial compression. The avatar has enabled, for the first time, the transition from faithful representation of grain morphologies in X-ray tomograms of granular media to a morphologically accurate discrete computational model. Grain-scale information is extracted and upscaled into a continuum finite element model through a hierarchical multiscale scheme, and the onset and evolution of a persistent shear band is modeled, showing excellent quantitative agreement with experiment in terms of both grain-scale and continuum responses in the post-bifurcation regime. More importantly, consistency in results across characterization, discrete analysis and continuum response from multiscale calculations are found, achieving the first and long sought-after quantitative breakthrough in grain-scale analysis of real granular materials.

Item Type:Article
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URLURL TypeDescription ReadCube access
Kawamoto, Reid0000-0002-4936-5321
Additional Information:© 2015 Springer Berlin Heidelberg. Received: 17 December 2014; Accepted: 15 July 2015; Published online: 15 August 2015. This work is partially supported by the NSF CAREER Grant No. 1060087 and the AFOSR YIP Grant No. FA9550-11-1-0052 of the California Institute of Technology. This support is gratefully acknowledged.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-11-1-0052
Subject Keywords:Constitutive behavior – Granular media – Microstructure – Multiscale – X-ray computed tomography
Issue or Number:2
Record Number:CaltechAUTHORS:20160422-133622266
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Official Citation:Lim, KW., Kawamoto, R., Andò, E. et al. Acta Geotech. (2016) 11: 243. doi:10.1007/s11440-015-0405-9
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66416
Deposited By: Tony Diaz
Deposited On:22 Apr 2016 20:56
Last Modified:09 Mar 2020 13:18

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