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SUMMARY:Yielding and plasticity in active dense disordered solids - M. Lis
 a Manning (Syracuse University)
DTSTART:20260310T130000Z
DTEND:20260310T140000Z
UID:TALK243535@talks.cam.ac.uk
CONTACT:Balázs Németh
DESCRIPTION:Materials composed of active particles\, where energy is injec
 ted at the scale of the individual constituent parts\, are well-studied in
  the limits of low- and intermediate densities where particles are always 
 exchanging neighbors\, and recent work has also focused on the interesting
  statistical properties of active solids\, where neighbors are locked in p
 lace. In this talk I will instead focus on the regime where dense active m
 aterials transition between solid and fluid-like states\, driven by increa
 sing active forces. Open statistical physics questions include: what is th
 e nature of the yielding transition — does it share similarities with th
 e random field Ising model like passive sheared solids\, or is it entirely
  different? Is its behavior dominated by the disorder in the field of acti
 ve forces\, or the annealed disorder of the particle packing itself? Are p
 lastic events still localized as in amorphous passive matter\, and if so\,
  can they be predicted? Is there something akin to an energy landscape and
  if so\, what are its properties? Is there a constitutive law for such a m
 aterial? From a practical standpoint\, answers to these questions set the 
 stage for controlling active forces in order to generate shape-shifting so
 lids with the ability to rapidly and programmably alter their material pro
 perties.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4.
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