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SUMMARY:MEchanics GAthering –MEGA- Seminar: Shear jamming in dense suspe
 nsions and how to avoid it
DTSTART:20260519T100000
DTEND:20260519T110000
DTSTAMP:20260511T074345Z
UID:f7a4f38818c0a0ec6763b46f599804f6327105ed648c4ce5fcc33bc3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Martin Trulsson (Computational Chemistry\, Lund University)\n
 Abstract: Dense suspensions exhibit a rich rheology in which viscosity di
 verges as the packing fraction approaches a critical jamming value  φ_c.
  Within the pressure-imposed μ(J) framework\, particle friction strongly 
 lowers φ_c and gives rise to shear jamming and discontinuous shear thicke
 ning\, where force chains aligned with the flow lock the suspension into a
  fragile solid-like state. In this talk\, I show how this very fragility c
 an be exploited to avoid jamming: by rotating or perturbing the shear di
 rection — a protocol analogous to tacking against the wind — force cha
 ins are disrupted\, the effective jamming threshold is pushed to higher pa
 cking fractions\, and dissipation is reduced in frictional systems. I will
  also discuss how particle shape introduces a new phenomenon: directional
  shear jamming\, where elongated particles jam along one shear direction 
 but flow freely along another. Together\, these results point to practical
  routes to tune and mitigate jamming through flow protocols and partic
 le design.\n \n\nBio: Martin Trulsson is a Senior Lecturer in Computatio
 nal Chemistry at Lund University\, Sweden\, and currently a visiting profe
 ssor at Politecnico di Torino. He obtained his PhD from Lund University in
  2011\, working on molecular simulations of colloidal systems\, and subseq
 uently held postdoctoral positions at ESPCI Paris and Université Paris-Su
 d (Orsay)\, where his research expanded to the rheology of dense suspensio
 ns and electrostatic interactions in soft matter. His current work combine
 s discrete-element and hydrodynamic simulations to understand jamming\, sh
 ear thickening\, and flow protocols in dense particulate systems.\n\n \n
LOCATION:GC B1 10 https://plan.epfl.ch/?room==GC%20B1%2010 https://epfl.zo
 om.us/j/68096021948?pwd=DiE8amDIwYw1u3VtW2xWNGKtioKL2y.1
STATUS:CONFIRMED
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