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SUMMARY:Microstructured n-th gradient continuum models including piezoelec
 tric elements and electric circuits and some applications to acoustics
DTSTART:20150402T093000
DTEND:20150402T110000
DTSTAMP:20260407T091039Z
UID:97bc7edaae6d2c0db13e9939e5df77e01daa06c709c7c2d5326fc27e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Francesco dell’Isola\nUniversità di Roma - Sapienza\n
 Bio: Professor Francesco dell’Isola holds the Chair of Mechanics of Stru
 ctures at University of Rome "La Sapienza"\, Italy. He holds a degree in P
 hysics and a Ph.D. in Mathematical Physics from Università Federico II of
  Naples\, Italy. He is a mathematical physicist with a long experience in 
 Continuum Mechanics\, Mechanics of Solids and Structures and Vibration Con
 trol.\nHe holds  the United States Patent 6546316 (together with Vidoli a
 nd Henneke) and is co-author of 124 papers on peer reviewed international 
 journals. He is scientific responsible of the Laboratorio Strutture e Mate
 riali Intelligenti in Cisterna di Latina (Italy) and is Member of  the "C
 ollegio dei Docenti" of the Doctoral School in Theoretical and Applied Mec
 hanics Università di Roma La Sapienza and the Executive Committee of the 
 Research Center M&MoCS\, University of  L’Aquila (2012 – 2015). He wa
 s nominated as Membre du Conseil scientifique de l’Institut des sciences
  de l’ingénierie et des systèmes – CNRS (2014-2018). Finally he is M
 ember of the Editorial Board of five International Journals and was also M
 ember of the Scientific Committee of 13 International Conferences and Scho
 ols and was invited to hold more than 70 seminars or lectures in Europe an
 d USA.\nAbstract:\nComposites may have a complex behaviour at macro-scale 
 which is usually related to their micro-structure.  In particular composi
 tes may be endowed with a multiscale structure and may show at micro-level
  high contrast in physical and geometrical properties. As happens in livin
 g tissues\, smart composites may be able to change their constitutive equa
 tions by means of self-controlling processes\, which may be driven by mech
 anically suitably produced stimuli.\nSome numerical\, theoretical and expe
 rimental  results which were recently obtained will be presented showing 
 that a class of fibrous fabrics must be modelled by means of second gradie
 nt continua (at least) and that one can conceive to design new and efficie
 nt metamaterials whose performances can be really exotic. In particular so
 me microstructured fabrics constituted by fibres having bending stiffness 
 (pantographic sheets) and nearly-inextensible are carefully studied using 
 microscopic and macroscopic models. These examples show that: i) macro-mod
 els cannot belong to the class of Cauchy first gradient continua ii) some 
 fabrics whose micro-structure is really simple may have a very complex mac
 ro-behaviour\, iii) the dynamical response  of pantographic sheets can be
  really unexpected and iv) some delicate experimental set-ups are needed t
 o measure their main physical properties.\nA digression on the concept of 
 generalised contact forces in higher gradient continua and on the boundary
  conditions naturally arising in the theory of generalised continua will b
 e necessary  to consistently present the obtained result. This digression
  shows some of the the limits of standard continuum mechanics as conceived
  by Cauchy and motivates the conceptual effort (based on the Lagrangian Pr
 inciple of Virtual Work) which has been started by Gabrio Piola\, continue
 d by Toupin\, Mindlin and Germain and recently re-started by several resea
 rch groups to found the correct conceptual frame for generalised continuum
  mechanics.\nSome applications to wave propagation in complex materials ar
 e presented including some results about propagation in 2D pantographic st
 ructures which seem to indicate the existence of some solitary waves. In p
 articular some micro-structures including piezoelectric actuators intercon
 nected by optimal circuits are considered. The concept of optimal energy t
 ransduction is very fruitful in vibration and acoustic suppression.
LOCATION:ELG 116 http://plan.epfl.ch/?lang=fr&room=ELG+116
STATUS:CONFIRMED
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