Journal
ACTA GEOTECHNICA
Volume 11, Issue 2, Pages 243-253Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-015-0405-9
Keywords
Constitutive behavior; Granular media; Microstructure; Multiscale; X-ray computed tomography
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Funding
- NSF CAREER Grant [1060087]
- AFOSR YIP Grant of the California Institute of Technology [FA9550-11-1-0052]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1060087] Funding Source: National Science Foundation
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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.
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