BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:MechE Colloquium: Failure in granular materials : from localized e
 vents to shear bands
DTSTART:20230228T120000
DTEND:20230228T130000
DTSTAMP:20260526T225001Z
UID:bfcbba7b7c3bc064d4a5b0dfc3dafc6db5bf2797cd7de75e24c58787
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Jérôme Crassous\, Institute of Physics\, University of
  Rennes\nAbstract: Disordered materials (glasses\, granular media\, foams\
 , etc.) usually deform in heterogeneous ways. The deformation of materials
  is concentrated in localized areas\, such as shear bands. The mechanisms 
 responsible for this localization remain unclear and debated.I will show i
 n this seminar experimental results obtained on the formation and the dyna
 mic of shear bands in a granular medium.\n\nIn a first part\, I will prese
 nt an original method for measuring very small deformations using dynamic 
 light scattering. In the case of granular media\, incremental deformation 
 maps are obtained for average deformations of the order of a few ppm. I wi
 ll then discuss the organization of the plastic deformation before the def
 ormation localization occurs. Discrete reorganization events happens\, the
  nature of which will be specified. Finally\, I will discuss the deformati
 on fluctuations within an established shear band. Discrete events can be d
 efined\, with statistical properties identical to those of earthquake crus
 ts.\n\nBiography: Jérôme Crassous is a professor of Physics at the Unive
 rsity of Rennes. After a PhD on nano-wetting\, he was an assistant profess
 or at the ENS de Lyon where he worked on adhesion and lubrication force me
 asurements. At the University of Rennes\, he developed techniques for meas
 uring microstrain based on dynamic light scattering\, and used it to chara
 cterize deformations of granular materials. His current research interests
  include plasticity of granular materials\, and collective effects in fric
 tional media.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/64230566011
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR