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UID:69dbb0280a088
DTSTAMP:20260412T104600
DTSTART:20170403T113000
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TRANSP:OPAQUE
DTEND:20170403T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/747829-scattering-of-
 elastic-waves-in-amorphous-solids-revisiting-the-long-wavelength-limit-sim
 on-gelin-udem
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Scattering of elastic waves in amorphous solids: revisiting the lon
 g wavelength limit - Simon Gelin (UdeM)
DESCRIPTION:Scattering of elastic waves in amorphous solids: revisiting the
  long wavelength limit Simon Gelin\, département de physique\, UdeMcherch
 eur postdoctoral (groupe de Normand Mousseau)
\nabstract:
\nWhen excited i
 n amorphous solids (fused silica for instance)\, mechanical waves are damp
 ed out by various mechanisms which\, depending on the solid temperature an
 d the wave frequency\, may include atomic tunneling\, elastic scattering b
 y structural disorder or anharmonic phonon coupling. The scattering by str
 uctural disorder in the large wavelength limit is particularly interesting
  because it is controlled by local heterogeneities in the solid and might 
 thus give information about their properties. As an example\, if fluctuati
 ons of local elasticity were to rapidly decorrelate in space\, as was expe
 cted so far\, the damping coefficient would obey the Rayleigh law. Relying
  on new results obtained in a two-dimensional numerical model of glass as 
 well as numerical and experimental data available in the literature\, this
  presentation will first show that the damping coefficient quite surprisin
 gly deviates logarithmically from the Rayleigh law in amorphous solids. Th
 en it will be evidenced that this deviation originates from long range cor
 relations of elastic disorder which are themselves a consequence of simila
 r stress correlations.
\nCette conférence est présentée par le RQMPVer
 sant Nord du Département de physiquede l'Université de Montréal et de
  Génie physique de la Polytechnique.
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