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In situ mechanical characterization during deformation of PVC polymeric foams using ultrasonics and digital image correlation

Kidd, T. H. and Ravichandran, G. and Zhuang, S. (2012) In situ mechanical characterization during deformation of PVC polymeric foams using ultrasonics and digital image correlation. Mechanics of Materials, 55 . pp. 82-88. ISSN 0167-6636 . http://resolver.caltech.edu/CaltechAUTHORS:20121217-083339906

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Abstract

Cellular solids such as polymeric foams are finding increasing applications including its use as a core material for sandwich structures. In this study, a novel method is used to measure both the longitudinal and shear wave speeds of a material simultaneously while applying a compressive load in four different densities of polymeric foams made from the same base polymer, polyvinyl chloride (PVC). The study showed that there was a significant difference in evolution of the wave speeds and hence in the apparent modulus during deformation of the lower density foams in comparison to the higher density foams. The non-contact full-field method of digital image correlation (DIC) is used to gain insights into the failure modes during deformation. The lower density foams undergo heterogeneous deformation and failed due to buckling of cell walls. In contrast, the higher density foams undergo nominally homogeneous deformation due to plastic collapse. The failure mode transition is shown to be governed by the relative density of the foams and the mechanical properties of the polymer.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.mechmat.2012.08.001DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/S0167663612001433PublisherUNSPECIFIED
Additional Information:© 2012 Elsevier Ltd. Received 5 January 2012. Received in revised form 24 July 2012. Available online 23 August 2012. The support of the Office of Naval Research (Dr. Y.D.S. Rajapakse, Program Manager) is gratefully acknowledged. The authors thank the DIAB Corporation for providing the Divinycell foams used in this study and Dr. S. Hong for his help with the digital image correlation (DIC) studies.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:Polymeric foams; Mechanical behavior; Ultrasonics; Digital image correlation; Elastic buckling; Plastic collapse
Record Number:CaltechAUTHORS:20121217-083339906
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121217-083339906
Official Citation:T.H. Kidd, S. Zhuang, G. Ravichandran, In situ mechanical characterization during deformation of PVC polymeric foams using ultrasonics and digital image correlation, Mechanics of Materials, Volume 55, December 2012, Pages 82-88, ISSN 0167-6636, 10.1016/j.mechmat.2012.08.001. (http://www.sciencedirect.com/science/article/pii/S0167663612001433)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36000
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:17 Dec 2012 16:50
Last Modified:29 Sep 2016 23:16

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