Impact response of density graded cellular polymers

Behrad Koohbor; Suraj Ravindran; Addis Kidane

doi:10.1007/978-3-319-62956-8_4

Impact response of density graded cellular polymers

Behrad Koohbor, Suraj Ravindran, Addis Kidane

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

4 Scopus citations

Abstract

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 language	English (US)
Title of host publication	Dynamic Behavior of Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics
Editors	Leslie Lamberson, Steven Mates, Jamie Kimberley
Publisher	Springer New York LLC
Pages	17-23
Number of pages	7
ISBN (Print)	9783319629551
DOIs	https://doi.org/10.1007/978-3-319-62956-8_4
State	Published - 2018
Externally published	Yes
Event	Annual Conference and Exposition on Experimental and Applied Mechanics, 2017 - Indianapolis, United States Duration: Jun 12 2017 → Jun 15 2017

Publication series

Name	Conference Proceedings of the Society for Experimental Mechanics Series
Volume	1
ISSN (Print)	2191-5644
ISSN (Electronic)	2191-5652

Other

Other	Annual Conference and Exposition on Experimental and Applied Mechanics, 2017
Country/Territory	United States
City	Indianapolis
Period	6/12/17 → 6/15/17

Bibliographical note

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

Keywords

Digital image correlation
Direct impact
Dynamic loading
Graded structure
Polymeric foam

Publisher link

10.1007/978-3-319-62956-8_4

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Koohbor, B., Ravindran, S., & Kidane, A. (2018). Impact response of density graded cellular polymers. In L. Lamberson, S. Mates, & J. Kimberley (Eds.), Dynamic Behavior of Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics (pp. 17-23). (Conference Proceedings of the Society for Experimental Mechanics Series; Vol. 1). Springer New York LLC. https://doi.org/10.1007/978-3-319-62956-8_4

Impact response of density graded cellular polymers. / Koohbor, Behrad; Ravindran, Suraj; Kidane, Addis.
Dynamic Behavior of Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. ed. / Leslie Lamberson; Steven Mates; Jamie Kimberley. Springer New York LLC, 2018. p. 17-23 (Conference Proceedings of the Society for Experimental Mechanics Series; Vol. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Koohbor, B, Ravindran, S & Kidane, A 2018, Impact response of density graded cellular polymers. in L Lamberson, S Mates & J Kimberley (eds), Dynamic Behavior of Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. Conference Proceedings of the Society for Experimental Mechanics Series, vol. 1, Springer New York LLC, pp. 17-23, Annual Conference and Exposition on Experimental and Applied Mechanics, 2017, Indianapolis, United States, 6/12/17. https://doi.org/10.1007/978-3-319-62956-8_4

Koohbor B, Ravindran S, Kidane A. Impact response of density graded cellular polymers. In Lamberson L, Mates S, Kimberley J, editors, Dynamic Behavior of Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. Springer New York LLC. 2018. p. 17-23. (Conference Proceedings of the Society for Experimental Mechanics Series). doi: 10.1007/978-3-319-62956-8_4

Koohbor, Behrad ; Ravindran, Suraj ; Kidane, Addis. / Impact response of density graded cellular polymers. Dynamic Behavior of Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. editor / Leslie Lamberson ; Steven Mates ; Jamie Kimberley. Springer New York LLC, 2018. pp. 17-23 (Conference Proceedings of the Society for Experimental Mechanics Series).

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title = "Impact response of density graded cellular polymers",

abstract = "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.",

keywords = "Digital image correlation, Direct impact, Dynamic loading, Graded structure, Polymeric foam",

author = "Behrad Koohbor and Suraj Ravindran and Addis Kidane",

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N2 - 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.

AB - 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.

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ER -

Impact response of density graded cellular polymers

Abstract

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