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.
Buckling and Growth of Delamination in Thermoset and Thermoplastic Composites
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Gillespie, J. W., Jr., and Carlsson, L. A. (January 1, 1991). "Buckling and Growth of Delamination in Thermoset and Thermoplastic Composites." ASME. J. Eng. Mater. Technol. January 1991; 113(1): 93–98. https://doi.org/10.1115/1.2903387
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