Abstract
In this study, GLARE 5 fiber-metal laminates (FMLs) of dimensions: 254mm25.4mm (10″×1″) with various thicknesses were impacted by a 0.22 caliber bullet shaped projectile using a high-speed gas gun. The specimens were cut transversely through the impact center using a diamond blade cutting wheel for destructive damage evaluation. The results showed that failure pattern was changed as the specimen thickness increased. This was very obvious especially for (5/4) and (6/5) configurations. In addition, a high-speed camera was used to record the damage evolution on the non-impacted side of the specimens. It was found that when impacted ballistically by the same projectile velocity, debonding between the bottom (non-impacted side) aluminum layer and its adjacent glass-fiber reinforced epoxy layer was increased by changing the lay-up configuration from (6/5) to (5/4). This phenomenon was demonstrated experimentally using the video footage obtained from the high-speed camera.
The 3D dynamic nonlinear finite element (FE) code, LS-DYNA, was used to validate the experimental results. To validate the reliability of the model, the finite element results were compared to those data obtained experimentally, namely: the incident versus residual velocity relation, damage patterns and bullet residual lengths. Good agreement between experimental and FE results was achieved.
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Acknowledgments
The authors would like to thank the supports from NASA Faculty Award for Research (FAR) under Grant No. NAG3-2259 and from PSC-CUNY under Grants 63168-00 41 and 64543-00 42. Dr. Kenneth J. Bowles and Dr. John P. Gyekenyesi were the Technical Monitors of the NASA grant. Part of the equipment was procured through ARO Grant No. DAAD19-03-1-0086, of which Dr. Bruce LaMattina was the Program Manager.
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© 2013 The Society for Experimental Mechanics, Inc.
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Yaghoubi, A.S., Liaw, B. (2013). Thickness Effect on Cross-Ply GLARE 5 FML Beams Subjected to Ballistic Impact. In: Ventura, C., Crone, W., Furlong, C. (eds) Experimental and Applied Mechanics, Volume 4. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4226-4_45
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DOI: https://doi.org/10.1007/978-1-4614-4226-4_45
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