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SUMMARY:Modelling of wetted granular media - Dr Jean-Yves Delenne\, Labora
 toire de Mécanique et Génie Civil (LMGC)\,Université Montpellier
DTSTART:20120217T160000Z
DTEND:20120217T170000Z
UID:TALK35633@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:Granular media are composed of particles with specific kinemat
 ics dictated by steric constraints and frictional contacts that are respon
 sible for the rich behaviour of these materials at the macroscopic scale. 
  In nature and industrial applications\, granular media occur also very of
 ten with cohesive bonds between the particles. These bonds may have differ
 ent physico-chemical origins such as capillary bonds\, van der Waals inter
 actions and cement deposit that may be affected by environmental \nfactors
  such as moisture and temperature.\n \nIn this talk\, I will mainly focus 
 on the modelling of the liquid states as a function of wetting and its eff
 ect on the strength properties.  Two main cases will be investigated in de
 tail:\n\n- For low water content binary capillary bridges appear at the co
 ntacts between grains. \nIn this case\, the behaviour of the capillary bri
 dge is determined from the integration of the Laplace law and implemented 
 as a force law within a distinct-element model.\n\n- For higher water cont
 ent\, the liquid can form complex clusters. In this case\, a thermodynamic
 -based model is used to account for liquid-gaz phase transition.\n
LOCATION:Engineering Department - Lecture Room 6
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