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BEGIN:VEVENT

CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Panel/Seminar/Colloquium
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=18832edc-1c2ecfef-011c-46f0fbf5-000002ae:Carpenter\
 , Ruby Nell
CREATED:20221021T144244Z
DESCRIPTION:Surface curvature is explored as a largely unexplored route fo
 r the design of topological mechanical metamaterials and waveguides. Curv
 ature as a design parameter is first investigated in the context of perio
 dic minimal surfaces\, which provide a platform for topological mechanica
 l metamaterials. We specifically illustrate configurations of 1D and 2D l
 attices dimerized through parametrizations that systematically break spat
 ial symmetries\, and that form the bases for opening non-trivial band gap
 s and for introducing interfaces that support topological valley modes. T
 heir existence is illustrated through vibration and wave propagation expe
 riments conducted on additively manufactured minimal surface samples\, wh
 ich illustrate the confinement of topologically protected edge states alo
 ng engineered interfaces and confirm the lack of significant backscatteri
 ng at sharp corners. This study supports the vision of minimal surfaces a
 s a general framework where geometrical modulations and symmetries can be
  introduced to achieve novel and unusual mechanical and acoustic function
 alities. \nIn the second part of the talk\, curvature is explored as a me
 an to induce spatial variations of the effective refractive index of wave
 guides. Graded refractive index distributions usually requires the use of
  metamaterials\, which pose manufacturing challenges\, and introduce band
 width limitations. It is here shown that the effect of a variable refract
 ive index is equivalently achieved by warping the waveguide in space. We 
 specifically illustrate how elastic waves can be manipulated through curv
 ed surfaces characterized by generic Gaussian curvature distributions. By
  operating within the short wavelength limit\, we show that homogeneous c
 urved waveguides can be designed by relating the refractive index to the 
 Gaussian curvature. Consequently\, the wave trajectories can be predicted
  by means of geodesic analysis of the surface followed by a classical ray
  tracing approach. Our theoretical predictions are validated by experimen
 ts conducted on additively printed curved waveguides which demonstrate ho
 w spatial curvature can be used for wave guiding and focusing using simpl
 e\, and possible reconfigurable\, structural configurations.
DURATION:PT1H
DTSTAMP:20221021T144244Z
DTSTART;TZID=America/New_York:20221024T120000
LAST-MODIFIED:20221021T144244Z
LOCATION;X-BEDEWORK-UID=18832e99-20476e5b-0120-58864347-000000be:Fitzpatri
 ck Center Schiciano Auditorium Side A\, room 1464
STATUS:CONFIRMED
SUMMARY:CEE Seminar: Elastic Wave Control Through Topology and Curvature
UID:CAL-8a0183a7-83184018-0183-faff16ee-000051a3demobedework@mysite.edu
URL:https://cee.duke.edu/
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Panel_Seminar_Colloquium:/us
 er/public-user/Lectures_Conferences/Panel_Seminar_Colloquium
X-BEDEWORK-SPEAKER:Massimo Ruzzene\, University of Colorado Bouler\, Bould
 er CO- Dept. of Mechanical Engineering\, Smead Aerospace Engineering Scie
 nces
X-BEDEWORK-DUKE-SERIES:CEE Fall 2022 Seminar Series
X-BEDEWORK-SUBMITTEDBY:rubync for Civil and Environmental Engineering (CEE
 ) (agrp_PrattSchool_CEE)
END:VEVENT
END:VCALENDAR