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ISRN Materials Science
Volume 2013 (2013), Article ID 408596, 9 pages
http://dx.doi.org/10.1155/2013/408596
Research Article

On the Failure and Fracture of Polymer Foam Containing Discontinuities

Department of Mechanical Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA

Received 19 June 2013; Accepted 4 August 2013

Academic Editors: Y. Hiraoka and K. Hokamoto

Copyright © 2013 Addis Kidane. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An experimental study is performed to investigate the tensile failure and fracture behavior of polymer foam containing discontinuities. PVC corecell foam, series A800 and A1200 is used for the investigation. Unnotched dog-bone specimen and specimens with center hole and edge cracks are tested under uniaxial tensile loading. Series of experiments are conducted at different defect size to width ratios, and the effect of the defect size on the net-section tensile strength of the foam is investigated. A fracture study is also conducted, and the effect of density and loading rate on the fracture behavior of foam is investigated. A minimal notch-strengthening effect is observed in specimens with center hole, and a notch-weakening effect is observed in specimen with edge notches. Furthermore, the fracture toughness increases with the increase in the foam density and decreases with the increase in loading rate.