Effect of radial confinement on wave propagation and vibrational response in bars

Jacob C. Dodson, Jason R. Foley, Janet C. Wolfson, Jonathan Hong, Vincent Luk, Alain Beliveau, Alexander Idesman

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


It is currently beyond the state-of-the art to accurately predict the instantaneous dynamic response of a structure with rapidly changing boundary conditions. In order to establish a basic understanding of changing boundary conditions, we examine the wave propagation through a bar subject to mechanical confinement. The Air Force Research Laboratory has conducted several experiments investigating the effect of non-traditional boundary conditions, such as mid-structure confinement, on the local and global dynamic response of rods using a modified Hopkinson Bar configuration with radial clamping. We have shown that the wave velocity in the mechanically clamped area is significantly lower than that in a stress free bar. This paper presents the experimental results and analytical modeling of the effect of radial confinement on dynamic response in bars.

Original languageEnglish
Title of host publicationMEMS and Nanotechnology - Proceedings of the 2014 Annual Conference on Experimental and Applied Mechanics
EditorsLaVern Starman, Barton C. Prorok, Jennifer Hay, Gordon Shaw
PublisherSpringer New York LLC
Number of pages13
ISBN (Print)9783319070032
StatePublished - 2015
EventAnnual Conference on Experimental and Applied Mechanics, 2014 - Greenville, United States
Duration: Jun 2 2014Jun 5 2014

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


ConferenceAnnual Conference on Experimental and Applied Mechanics, 2014
Country/TerritoryUnited States


  • Confined effects
  • Dispersion
  • Experimental mechanics
  • Hopkinson bar
  • Wave propagation


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