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SUMMARY:MechE Colloquium: When Materials Bend the Rules: Buckling Response
  of Slender Structures Born of Constitutive Nonlinearities
DTSTART:20260414T120000
DTEND:20260414T130000
DTSTAMP:20260415T003529Z
UID:fa70d600d00df14be77ceab51b49ae029fe56f04bbaa4247d1386369
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Draga Pihler-Puzović\, Department of Physics and Astr
 onomy\, University of Manchester\nAbstract: Buckling of slender structures
 \, such as perforated columns and cylindrical shells\, underpins a wide ra
 nge of systems and processes\, from the structural failure of rocket fusel
 ages and grain silos to engineered devices such as shock absorbers and cru
 mple zones. Historically\, research has primarily focused on predicting th
 e onset of buckling—that is\, the loss of the original configuration und
 er excessive loading—rather than on understanding how structures evolve 
 in the post-buckling regime. Recently\, however\, the study of buckling ha
 s experienced a renaissance\, with post-buckling mechanical responses incr
 easingly exploited to achieve new functionalities\, for example enhancing 
 fracture resistance in stretchable electronics and flexible displays.\n\nW
 hile most existing studies consider elastically deforming systems whose be
 haviour arises primarily from geometric nonlinearities\, this talk present
 s examples in which geometric effects are coupled with nonlinear constitut
 ive responses\, giving rise to new post-buckling mechanisms. First\, we in
 vestigate the buckling of hard\, perforated (“holey”) structures that 
 exhibit auxetic behaviour but\, unlike their purely elastic counterparts\,
  undergo post-buckling softening. The resulting negative stiffness is capt
 ured using a pseudo-plastic constitutive model that describes nonlineariti
 es emerging from the structural microarchitecture.\n\nWe then apply a simi
 lar framework to examine the buckling of beverage cans largely filled with
  liquid under axial compression. Whereas empty cylindrical shells typicall
 y develop periodic buckling patterns that break both axial and circumferen
 tial symmetry\, liquid-filled cylinders buckle axisymmetrically. The resul
 ting ring-shaped buckles are localized and emerge sequentially\, progressi
 vely covering the can surface. We show that this behaviour arises from non
 linear\, spatially anisotropic hoop stresses that soften and subsequently 
 re-stiffen during compression.\n\nBiography: Draga Pihler-Puzovic is a Re
 ader in the Department of Physics and Astronomy at the University of Manch
 ester and a core member of the Manchester Centre for Nonlinear Dynamics. H
 er research focuses on fluid–structure interactions\, low-Reynolds-numbe
 r flows\, and the deformation of slender solid structures. She employs a c
 ombination of experimental\, numerical\, and analytical approaches to inve
 stigate fundamental problems in fluid and solid mechanics\, and has made s
 ignificant contributions to the understanding of instabilities arising in 
 fluid–structure interactions\, including viscous fingering beneath elast
 ic sheets\, sedimentation dynamics and deformation of mechanical metamater
 ials.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/61360740951
STATUS:CONFIRMED
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