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SUMMARY:Ensemble average waves in random materials of any geometry - Art G
 ower (University of Sheffield)
DTSTART:20210518T110000Z
DTEND:20210518T120000Z
UID:TALK160156@talks.cam.ac.uk
CONTACT:Mungo G. Aitken
DESCRIPTION:Which is more useful: knowing the effective properties of a ma
 terial\, or its effective wavenumbers? In a low frequency regime these are
  essentially the same\, but when the wavelength becomes comparable to the 
 microstructure’s size\, they are not. Using a broad range\nof frequencie
 s is needed to characterize materials and to design for broad wave speed c
 ontrol and attenuation. \n\nSuppose we perform an experiment that measures
  the scattered field from a material with a random microstructure. We coul
 d then find what effective properties would lead to the same scattered fie
 ld we measured. So far so good. But what if we took that same microstructu
 re and molded it into a different geometry and then repeated the experimen
 t? The bad news is that even when using the same frequency we would potent
 ially find a different set of effective properties. In contrast\, in this 
 talk I show how effective wavenumbers are inherently related to the materi
 al microstructure and not its geometry.
LOCATION:Zoom
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