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Published April 2016 | public
Journal Article

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


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.

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.

Additional details

August 20, 2023
October 18, 2023