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SUMMARY:MechE Colloquium: Folding of a continuum and energy releasing or f
 luttering rods
DTSTART:20181211T121500
DTEND:20181211T131500
DTSTAMP:20260427T203651Z
UID:a718e54143e26f7295b0ba6a4cbc3fb2d9eeef1f6b62377c303c0d65
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Davide Bigoni\, Solid and Structural Mechanics Group\, D
 epartment of Civil\, Environmental and Mechanical Engineering\, University
  of Trento\nAbstract:\nIt will be shown that Cosserat elastic solids with 
 extreme anisotropy may exhibit folding and faulting\, the former being the
  process in which bending localizes into sharp corners separated by almost
  undeformed elements\, while the latter corresponds to the formation of di
 splacement jumps of finite size [1\,2]. While faulting can be often observ
 ed in geological formations\, folding is rarely encountered in nature and 
 is difficult to be described within the realm of the Cauchy theory of elas
 ticity\, but is shown to become possible in constrained Cosserat elastic m
 aterials.\n\nThe nonlinear theory of elastic rods is a framework for descr
 ibing bifurcation and instabilities of a number of interesting structures\
 , showing for instance configurational forces analogous to those acting on
  dislocations in solids. Several problems influenced by configurational fo
 rces or involving elastic energy releases will be resented\, including sna
 king of an elastic rod [3\, 4].\n\nThe dynamics of an elastic rod in a can
 tilever configuration and subject to a tangential follower load of the ‘
 Ziegler type’ at its end (the ‘Pfluger problem’) is finally addresse
 d. This structure is subject to a Hopf bifurcation\, corresponding to the 
 initiation of the so-called ‘flutter instability’. A new experimental 
 set-up has been designed\, produced and tested to realize the follower loa
 d. Experiments provide the evidence of flutter and divergence instability 
 and provide the first proof that damping sources have a destabilizing effe
 ct on the system (the so-called ‘Ziegler paradox’) [5].\n\nReferences\
 n[1] Bigoni\, D.\, Gourgiotis\, P.A. (2016) Folding and faulting of an ela
 stic continuum. Proc. Royal Soc. A 472\, 20160018.\n[2] Gourgiotis\, P.A.\
 , Bigoni\, D. (2017) The dynamics of folding instability in a constrained 
 Cosserat medium. Phil. Trans. Royal Soc. A\, 375\, 20160159.\n[3] Dal Cors
 o\, F.\, Misseroni\, D.\, Pugno\, N.M.\, Movchan\, A.B.\, Movchan\, N.V.\,
  Bigoni\, D. (2017) Serpentine locomotion through elastic energy release. 
 J. Royal Soc. Interface 14\, 20170055.\n[4] Armanini\, C.\, Dal Corso\, F.
 \, Misseroni\, D.\, Bigoni\, D. (2017) From the elastica compass to the el
 astica catapult: an essay on the mechanics of soft robot arm. Proc. Royal 
 Soc. A 473\, 20160870.\n[5] Bigoni\, D.\, Kirillov\, O.\, Misseroni\, D.\,
  Noselli\, G.Tommasini\, M. (2018) Flutter and divergence instability in t
 he Pflüger column: Experimental evidence of the Ziegler destabilization p
 aradox. J. Mech. Phys. Solids 116\, 99-116.\n\nBio:\nDavide Bigoni is a me
 chanician working in solid and structural mechanics and material modeling\
 , wave propagation\, fracture mechanics. His approach to research is the e
 mployment of a broad vision of mechanics\, with a combination of mathemati
 cal modelling\, numerical simulation\, and experimental validation. From 2
 001 Davide Bigoni holds a professor position at the University of Trento\,
  where he is leading a group of excellent researchers in the field of Soli
 d and Structural Mechanics.\n\nHe has authored or co-authored more than 10
 0 journal papers and has published a book on nonlinear Solid Mechanics. He
  was elected in 2009 Euromech Fellow (of the European Mechanics Society)\,
  has received in 2012 the Ceramic Technology Transfer Day Award (of the AC
 IMAC and ISTEC-CNR)\, in 2014 he has received the Doctor Honoris Causa deg
 ree at the Ovidius University of Constanta and in 2016 the Panetti and Fer
 rari Award for Applied Mechanics (from Accademia delle Scienze di Torino).
  He has been awarded an ERC advanced grant in 2013. He is co-editor of the
  Journal of Mechanics of Materials and Structures and associate Editor of 
 Mechanics Research Communications and in the editorial board of 8 internat
 ional journals.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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