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PRODID:-//Columba Systems Ltd//NONSGML CPNG/SpringViewer/ICal Output/3.3-
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VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20180109T113903Z
DTSTART:20180112T110000Z
DTEND:20180112T120000Z
SUMMARY:NWCC Seminar entitled "Propagation of Elastic Waves in Composites
and Nanostructures"
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}rah-jc7kch4
1-u3ztbx
DESCRIPTION:Propagation of elastic waves is quite complex in laminated co
mposites due to the presence of bending-axial coupling arising due to un
symmetric laminate sequence. The group speeds of the wave can be increas
ed or decreased depending upon the ply-layup sequence. \nIn this talk\,
I will introduce the spectral analysis of motion and show how the how th
is can be used to determine the wave propagation parameters\, namely the
group speeds and wavenumbers\, which can be used to determine the natur
e of waves propagating in the \nmedium. The talk will cover wave propaga
tion behavior of both 1-D and 2-D composite waveguides. The talk will th
en introduce spectral finite element formulation for wave propagation an
alysis and use this approach to show wave scattering in different wavegu
ides of \nincreasing complexity\, which include determination of Lamb wa
ve modes in composites\, where its usage in Structural Health Monitoring
\n\nThe second part of the lecture will deal with the propagation of ela
stic waves in nanostructures. Here\, I will first introduce gradient ela
sticity theory\, which will then be used to determine the wave parameter
s\, namely the wavenumbers and group speed. \nThe important aspect of wa
ves in nanostructures is the presence of escape frequency\, where the wa
venumbers tends to infinity and group speeds tends to zero. Beyond the e
scape frequency\, the propagation of waves stops creating a non-periodic
bandgap. \nHere\, in particular\, the wave propagation in single and Mu
ltiwall nanotubes and Graphene with or without substrate will be detaile
d in this talk. Also\, a simplified approach to determining the no-local
parameter will be presented.\n
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:E-Floor Meeting Room\, James Lighthill Building
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