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UID:0-474@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20160622T163000

DTEND;TZID=Asia/Jerusalem:20160622T173000

DTSTAMP:20230603T191353Z

URL:https://aerospace.technion.ac.il/events/ph-d-seminar-in-memory-of-prof
 -shmuel-and-mrs-noemi-merhav-manipulating-wave-propagation-in-soft-metamat
 erials-via-external-stimuli/

SUMMARY:Ph.D. Seminar in Memory of Prof. Shmuel and Mrs. Noemi Merhav - Man
 ipulating Wave Propagation in Soft Metamaterials 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 Recently\, acoustic metamaterials with periodic microstruc
 tures (referred as phononic crystals) have attracted considerable attentio
 n due to their remarkable properties – such as negative elastic moduli\,
  mass density\, and refractive index – stemming from their microstructur
 es. Moreover\, the ability of soft metamaterials to sustain large deformat
 ions opens rich possibilities for manipulating acoustic characteristics by
  deformation. Hence\, elastic waves can be tuned by constructing microstru
 ctures\, which can be further actively controlled by external stimuli\, e.
 g.\, by mechanical loading\, magnetic or electric fields.\nIn this talk\, 
 we will start with the discussion of the acoustic properties of the relati
 vely simple homogeneous hyperelastic materials\, and then we will turn to 
 the materials with periodic microstructures. First\, we will explore the i
 nfluence of the deformation induced stiffening on the propagation of small
 -amplitude elastic plane waves. Second\, we will show that electroactive h
 omogeneous materials can be utilized to achieve acoustic functionalities s
 uch as disentangling of pressure and shear waves by application of an elec
 tric field. Next\, we will proceed with the analysis of wave propagation i
 n highly deformable layered materials. In particular\, we will present the
  long wave estimates of the phase and group velocities for the waves propa
 gating in finitely deformed layered media. Moreover\, we will introduce th
 e material compositions and loading conditions producing wide complete ban
 d gaps (i.e. frequency ranges where neither pressure nor shear waves canno
 t propagate) at  low frequency ranges. Finally\, we will discuss the anis
 otropy of elastic wave propagation in finitely deformed fiber-reinforced c
 omposites.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20160325T030000

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