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SUMMARY:A Swiss Structures seminar from FlexLab  - Luna Lin\, Fani Derveni
 \, and Michael Gomez\, EPFL Lausanne
DTSTART:20221125T150000Z
DTEND:20221125T160000Z
UID:TALK185327@talks.cam.ac.uk
CONTACT:Jamie Clarkson
DESCRIPTION:Luna\, Fani and Michael are postdocs from the Flexible Structu
 res Laboratory\, EPFL Lausanne. Each will present a talk\, covering the fo
 llowing topics:\n\n(i) - Luna - The fluid-structure interaction of bristle
 d wings\n\nSlender structures  covered with hairs are commonly observed in
  nature. A particularly intriguing example is the bristled wings of miniat
 ure insects. With bristled wings\, miniature insects achieve flight via dr
 ag-based rowing mechanisms. By combining experiments\, simulations and the
 oretical analysis\, we aim to investigate the trade-off among weight\, sti
 ffness\, and drag of idealized models of the bristled wings. Particular em
 phasis is given to the role of elastic deformation of the bristles in modi
 fying the generated drag.\n\n\n(ii) - Fani - Shell buckling of imperfect s
 hells as an extreme-value statistics problem\n\nThe buckling capacity of t
 hin shells is highly sensitive to imperfections. Here\, we investigate the
  even more challenging problem of shells containing a random distribution 
 of defects. Focusing on elastic hemispherical shells\, we study the statis
 tics of critical buckling loads using experimentally validated finite elem
 ent modeling (FEM). Our results suggest that the shell buckling of shells 
 containing a random distribution of defects can be regarded as a 'weakest-
 link' problem governed by extreme-value statistics. \n\n\n(iii) - Michael 
 - Elastic ribbons with inhomogeneous pre-stress: twisting instabilities an
 d reduced models\n\nFor a slender elastic filament subject to small pre-st
 ress\, it is well known that the system can be modelled as an Euler–Bern
 oulli rod with effective natural curvature and twist. However\, a challeng
 e is to formulate effective models in situations where the Euler–Bernoul
 li  kinematic assumptions do not apply. To address the need for simple\, r
 educed models of such filaments\, in this talk we analyse elastic ribbons 
 subject to large\, inhomogeneous pre-stress as a model system. We find tha
 t the buckling behaviour provides a macroscopic analogue of several critic
 al phenomena in the classical theory of thermodynamic phases.\n\n\nThe mee
 ting can be viewed in CivEng or joined online:\n \nhttps://eng-cam.zoom.us
 /j/82357897828?pwd=SnhDdFJjQS9xNlFFQWtTTW5LNzlGdz09\n
LOCATION:CivEng Conference Room (2-54) (Civil Engineering Building)
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