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SUMMARY:Beyond Willis Materials: Trianisotropy and the Electromomentum Eff
 ect  - Gal Shmuel (Israel Institute of Technology)
DTSTART:20220613T140000Z
DTEND:20220613T150000Z
UID:TALK174713@talks.cam.ac.uk
CONTACT:Alistair Hales
DESCRIPTION:By developing and applying a homogenization scheme for elastod
 ynamics\, Willis discovered that the momentum of composite materials is ma
 croscopically coupled with their strain. This coupling is captured by the 
 now-termed Willis tensor\, which not only enlarges the design space of met
 amaterials\, but is also necessary for obtaining a meaningful effective de
 scription that respects basic physical laws. In this talk\, I will show ho
 w additional tensors of Willis type emerge by general- izing the homogeniz
 ation theory of Willis to thermoelastic-\, piezomagnetic- or piezoelectric
  media. As a result\, the obtained effective constitutive equations have a
  tri-anisotropic form. I will provide examples for piezoelectric media tha
 t exhibit an effective electromomentum coupling. I will show that this cou
 pling is necessary for describing the effective properties of piezoelectri
 c media using a homogenized description that respects reciprocity and ener
 gy conservation. Finally\, I will demonstrate how this coupling can be use
 d to realize a device that actively control the phase of elastic waves.
LOCATION:MR14
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