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Journal of Composite Materials
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0021998306060163v1
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Digital Imaging and Fractographical Analyzes of Perforation-induced Delamination of Laminated Graphite-Epoxy Composite

S. N. Wosu

Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA, wosu{at}engr.pitt.edu

D. Hoy

Department of Mechanical Engineering, Tennessee Technological University, Cookeville, TN 38505, USA

A digital imaging technique for characterizing dynamic delamination in laminated composites is presented in this article. Perforation-induced delamination surfaces are generated using a conical and protruding hemispherical penetrators applied in the thickness direction using penetrating split Hopkinson pressure bar (P-SHPB). The results reveal that the extent of delamination depends strongly on the shape and geometry of the penetrator. Delamination is the dominant mode of failure for the conical hemispherical penetrator below the perforation limit energy but competes with matrix cracking at energy above the perforation limit. With the protruding penetrator, delamination mode continues to dominate at all energies. Hackles formation is not a characteristic of perforation-induced delamination.

Key Words: delamination • perforation limit energy • energy absorption • inter-laminar failure mode • hackle marks • impact energy

This version was published on September 1, 2006

Journal of Composite Materials, Vol. 40, No. 17, 1577-1602 (2006)
DOI: 10.1177/0021998306060163
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