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SUMMARY:CESS Seminar : Mechanics of Rapidly Compacted Granular Materials A
 cross Length Scales:  Insights from X-ray Imaging and Modeling
DTSTART:20240918T121500
DTEND:20240918T131500
DTSTAMP:20260502T063942Z
UID:8608191995cfa95574259a5c3e528bb3c69b834329dfa4638651b343
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Ryan Hurley\, Associate Professor of Mechanical Engineer
 ing\, Johns Hopkins University\nAbstract\nGranular materials are subjected
  to high pressures and strain rates during geophysical processes and in en
 gineering and defense applications. The mechanics of granular materials un
 der these conditions is complex and involves a combination of microscopic 
 processes such as grain breakage and meso- and macroscopic processes such 
 as deformation banding. Constitutive models used to predict responses to i
 mpact and penetration are increasingly making use of our knowledge of how 
 microscopic and mesoscopic processes progress. Here\, we discuss efforts t
 o understand and predict rapid compaction and penetration of dry and fully
  saturated granular materials at length scales ranging from individual gra
 ins and pores to bulk scales. We primarily focus on experimental developme
 nts and their connections to continuum constitutive models. We first discu
 ss small-scale planar compaction experiments which leverage x-ray imaging 
 and time-resolved x-ray phase contrast imaging. These experiments are comb
 ined with digital twin modeling to quantify pore collapse\, stress concent
 rations\, and dynamic force chains in 3D at the grain scale. We then discu
 ss penetration experiments at the bulk scale which employ flash x-ray imag
 ing and a novel method of 3D flow field reconstruction. Bulk scale experim
 ents are compared with a continuum constitutive model uniquely informed by
  other tests which quantify grain-scale processes such as a grain breakage
 . The audience will leave the talk with an appreciation of how in-situ ima
 ging and analysis can be used to inform our understanding of and modeling 
 capabilities for dynamic processes in granular materials.\n\n\nShort bio\n
 Ryan Hurley is an Associate Professor in the Department of Mechanical Engi
 neering with a secondary appointment in the Department of Civil and System
 s Engineering\, and a Faculty Fellow of the Hopkins Extreme Materials Inst
 itute at the Johns Hopkins University (JHU). Before joining JHU in 2018\, 
 Ryan received his Ph.D. in Applied Mechanics from Caltech and worked as a 
 postdoc in computational geomechanics at Lawrence Livermore National Labor
 atory. Ryan has received a 2017 Department of Energy’s Secretary’s App
 reciation Award\, a 2020 NSF CAREER Award\, a 2021 Army Education Outreach
  Program’s Mentor of the Year Award\, and a 2022 Air Force Office of Sci
 entific Research (AFOSR) Young Investigator Program Award. Ryan’s resear
 ch interests include studying the deformation and failure mechanisms of gr
 anular materials\, rocks\, and concrete using advanced experimental techni
 ques\, such as in-situ x-ray imaging and diffraction\, constitutive modeli
 ng\, and micromechanics.\n\nSandwiches are offered at the end of the semin
 ar.\n 
LOCATION:GC B1 10 https://plan.epfl.ch/?room==GC%20B1%2010 https://epfl.zo
 om.us/j/65327493335
STATUS:CANCELLED
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