Abstract
Impact responses and damage of various fiber-metal laminates were studied using a drop-weight instrument with the post-impact damage characteristics being evaluated through ultrasonic and mechanical sectioning techniques. The first severe failure induced by the low-velocity drop-weight impact occurred as delamination between the aluminum and fiber-epoxy layers at the non-impact side. It was followed by a visible shear crack in the outer aluminum layer on the non-impact face. Through-thickness shear cracks in the aluminum sheets and severe damage in the fiber laminated layers (including delamination between adjacent fiber-epoxy laminae with different fiber orientations) developed under higher energy impacts. The impact properties of fiber-metal laminates varied with different constituent materials and fiber orientations. Since it was punched through easily, the aramid-fiber reinforced fiber-metal laminates (ARALL) offered poorer impact resistance than the glass-fiber reinforced fiber-metal laminates (GLARE). Tougher and more ductile aluminum alloys improved the impact resistance. GLARE made of cross-ply prepregs provided better impact resistance than GLARE with unidirectional plies.
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Acknowledgements
This study was supported by NASA Faculty Award for Research (FAR) under Grant No. NAG3-2259 and by PSC-CUNY under Grants 61429-00 30 and 62466-00 31. Dr. Kenneth J. Bowles and Dr. John P. Gyekenyesi were the Technical Monitors of the NASA grant. Part of the equipment used in this investigation was acquired through Army Research Office Grant No. DAAD19-99-1-0366.
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Liu, Y., Liaw, B. Effects of Constituents and Lay-up Configuration on Drop-Weight Tests of Fiber-Metal Laminates. Appl Compos Mater 17, 43–62 (2010). https://doi.org/10.1007/s10443-009-9119-1
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DOI: https://doi.org/10.1007/s10443-009-9119-1