Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session V16: Packing and Jamming of Granular Materials
3:00 PM–5:48 PM,
Thursday, March 18, 2021
Sponsoring Units: GSNP DSOFT
Chair: Jeremy Lechman, Sandia National Laboratories
Abstract: V16.00001 : Quantifying Local Rearrangements in Granular Media Using X-ray Tomography, Diffraction, and Machine Learning*
3:00 PM–3:36 PM
(Johns Hopkins University)
Eric B Herbold
(Lawrence Livermore National Laboratory)
Stephen A Hall
(Solid Mechanics, Lund University)
In this talk, we discuss recent experiments combining in-situ X-ray computed tomography (XRCT) and 3D X-ray diffraction (3DXRD) to quantify local rearrangements in deforming 3D granular materials. We focus on granular materials with hundreds to thousands of nearly-spherical sapphire or quartz particles in uniaxial, hydrostatic, and triaxial loading conditions. Using microscopic structure and per-particle stress tensor measurements at small macroscopic strain increments, we examine the statistics and history-dependence of local rearrangement events, and study the features of the structure and force network that control when and where rearrangements occur via machine learning. We find that local rearrangements obey similar statistical distributions in various loading conditions and at various stress states, that materials retain significant memory of local rearrangements during monotonic loading, and that local structure plays a dominant role in predicting when and where large rearrangement events will occur.
*Lawrence Livermore National Laboratory LDRD program (LW-17-009) subcontracts to Johns Hopkins University and Lund University, the U.S. National Science Foudnation CAREER Award No. CBET-1942096, and synchrotron beamtime at the ESRF under grants ma-3373 and ma-4200.
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