Impact response of density graded cellular polymers

Behrad Koohbor, Suraj Ravindran, Addis Kidane

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


Full-field deformation response of density-graded cellular polymers subjected to high velocity impact is investigated experimentally. Recently developed experimental setup consisting of ultra-high speed imaging in conjunction with digital image correlation is used to measure in-situ full-field deformation on density-graded polymeric foam specimens. Loading of the specimens is performed using a direct impact configuration in a modified Hopkinson bar apparatus. Discretely-layered foam specimens made from three distinct layers each with a different bulk density are subjected to direct impact, while their deformation response is studied via ultra-high speed digital image correlation. Formation and propagation of compaction waves from the impact side to the support end of the specimen are observed and analyzed. Spatial distribution of inertia stress is determined from acceleration fields and density of the layers. Full-field stress distribution in the specimen is later used to estimate the stress gradients within compaction waves. Mechanisms associated with the energy dissipation in graded foam specimens are discussed.

Original languageEnglish (US)
Title of host publicationDynamic Behavior of Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics
EditorsLeslie Lamberson, Steven Mates, Jamie Kimberley
PublisherSpringer New York LLC
Number of pages7
ISBN (Print)9783319629551
StatePublished - 2018
Externally publishedYes
EventAnnual Conference and Exposition on Experimental and Applied Mechanics, 2017 - Indianapolis, United States
Duration: Jun 12 2017Jun 15 2017

Publication series

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


OtherAnnual Conference and Exposition on Experimental and Applied Mechanics, 2017
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2018, The Society for Experimental Mechanics, Inc.


  • Digital image correlation
  • Direct impact
  • Dynamic loading
  • Graded structure
  • Polymeric foam


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