BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Quasi-static rheology of granular materials. What we learned from 
 discrete simulations - Dr Jean-Noël Roux\, Ingénieur en Chef des Ponts e
 t des Eaux et Forêts\, Laboratoire Navier\, Paris
DTSTART:20120504T150000Z
DTEND:20120504T163000Z
UID:TALK36442@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:Some recent contributions of  Discrete Element Modelling (DEM)
  to the understanding of the micromechanical origins of the quasi-static m
 echanical behaviour of model granular materials are briefly reviewed\, wit
 h special attention to initial states resulting from different assembling 
 processes\, to pre-peak deformation and to elasticity. It is shown in part
 icular that different assembling procedures can produce very different coo
 rdination numbers for the same density. Two types of strains are distingui
 shed according to whether contact networks support load increments without
  instability and rearrangement. Type I strains directly result from materi
 al deformation in intergranular contact regions\; they scale with elastic 
 strains\, even though they correspond to large stress increments that exce
 ed by far the range of quasi-elastic response. Elastic moduli may be regar
 ded as probing coordination numbers\, stress and fabric anisotropy. Type I
 I strains stem from microscopic instabilities in which contact networks br
 eak and repair\, and their magnitude is controlled by packing geometry.  T
 he occurrence and implications of these different micromechanical origins 
 of strains are discussed. \n
LOCATION:Engineering Department - Lecture Room 6
END:VEVENT
END:VCALENDAR