Buckling and Growth of Delamination in Thermoset and Thermoplastic Composites

[+] Author and Article Information
J. W. Gillespie

Center for Composite Materials, Department of Mechanical Engineering, University of Delaware, Newark, DE 19716

L. A. Carlsson

Department of Mechanical Engineering, Florida Atlantic University, Boca Raton, FL 33431

J. Eng. Mater. Technol 113(1), 93-98 (Jan 01, 1991) (6 pages) doi:10.1115/1.2903387 History: Received November 01, 1989; Revised February 01, 1990; Online April 29, 2008


Compression instability growth of through-width delaminations in composite laminates is investigated. A previously developed beam model that incorporates effects of elastic restraint at the ends of the delamination is combined with a finite element superposition model that yields the Mode I (GI ) and Mode II (GII ) components of the strain energy release rate. Experimental data were generated for near surface delaminations over a wide range of crack lengths in unidirectional graphite/epoxy and graphite/PEEK laminates. Good agreement between experimentally observed critical loads for crack propagation and analytical predictions was observed using a linear mixed-mode crack growth criterion.

Copyright © 1991 by The American Society of Mechanical Engineers
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