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SUMMARY:Scattering and multiple scattering in nonlinearly pre-stressed mat
 erials - William Parnell (University of Manchester)
DTSTART:20230526T084500Z
DTEND:20230526T093000Z
UID:TALK198835@talks.cam.ac.uk
DESCRIPTION:In this talk we discuss how nonlinear pre-stress affects the m
 anner by which elastic waves propagate in complex materials. We begin with
  an overview of how pre-stress changes propagation in simple homogeneous e
 lastic media. The key point here is that it induces anisotropy in the mate
 rial\, but it can also induce a (perhaps unexpected) modification to the s
 ymmetry properties of the incremental elastic modulus tensor. This propert
 y is then exploited to explain how pre-stress than be employed as a natura
 l cloaking mechanism around a region of space for specific types of nonlin
 ear materials.\nWe then go on to take this property further in complex mat
 erials with periodic arrays of coated scatterers. We show that materials c
 an be designed such that the band-gap structure is invariant\, or at least
  close-to-invariant to imposed deformation for both in-plane and antiplane
  waves propagating in the pre-stress structure.\nWe finish by discussing p
 re-stressed foams\, including some recent experimental results on the buck
 led microstructure of syntactic foams under large pre-stress.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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