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UID:0-404@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180411T163000

DTEND;TZID=Asia/Jerusalem:20180411T173000

DTSTAMP:20230530T180420Z

URL:https://aerospace.technion.ac.il/events/manipulating-elastic-wave-prop
 agation-in-non-linear-flexible-materials-via-external-stimuli/

SUMMARY:Manipulating Elastic Wave Propagation in Non-Linear Flexible Materi
 als via External Stimuli
DESCRIPTION:Lecturer:Pavel Galich\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n Ranging from the aerospace to the health industries\, unde
 rstanding of wave propagation phenomenon in solids is pivotal to a large n
 umber of practical applications\, e.g.\, reduction or elimination of undes
 irable noise and vibrations in aerospace structures\, nondestructive mater
 ial testing\, or noninvasive medical diagnostic procedures. Although wave 
 propagation in continuum media has been investigated extensively in past d
 ecades\, there is still a big venue for research. For example\, the abilit
 y of flexible materials to sustain large deformations opens rich prospects
  for manipulating elastic wave characteristics by deformation. Moreover\, 
 elastic waves can be tuned through designing micro- or macro-structures\, 
 which can be further actively controlled by external stimuli\, such as mec
 hanical loading\, electric or magnetic fields. However\, before switching 
 to complex architectured materials undergoing large deformations\, we firs
 t need to understand how large deformations affect relatively simple isotr
 opic and more complex anisotropic materials.\nIn this talk\, we will start
  with the discussion of the acoustic properties of the relatively simple i
 nitially isotropic non-linear materials and proceed with the periodic laye
 red and fiber composites made of these materials. Firstly\, we will elabor
 ate on the influence of the deformation induced stiffening (intrinsic feat
 ure of most soft materials) on the propagation of small-amplitude elastic 
 plane waves. Secondly\, we will illustrate that electroelastic isotropic m
 aterials (i.e. dielectric elastomers) can be utilized to achieve acoustic 
 functionalities such as decoupling of pressure and shear waves by applicat
 ion of an electric field. Thirdly\, we will analyse wave propagation in no
 n-linear elastic and electroelastic laminates. In particular\, we will pre
 sent the long wave estimates of the phase and group velocities for the wav
 es propagating in the laminates subject to external mechanical or electric
 al stimuli. Moreover\, we will introduce the material compositions and loa
 ding conditions producing wide complete band gaps (frequency ranges where 
 neither pressure nor shear waves can propagate) at low frequency ranges. F
 inally\, we will discuss the anisotropy of elastic wave propagation in fin
 itely deformed fiber composites (FCs) of different periodicity. Specifical
 ly\, we will investigate the influence of fiber arrangements on shear wave
  propagation in these FCs. Additionally\, we will show how shear waves pro
 pagating along fibers relate to the elastic instabilities in FCs and revea
 l how fiber periodicity influences elastic instabilities in FCs.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20180323T030000

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