Abstract
The high velocity impact response of a range of polypropylene-based fibre-metal laminate (FML) structures has been investigated. Initial tests were conducted on simple FML sandwich structures based on 2024-O and 2024-T3 aluminium alloy skins and a Self-Reinforced Polypropylene (SRPP) composite core. Here, it was shown that laminates based on the stronger 2024-T3 alloy offered a superior perforation resistance to those based on the 2024-O system. Tests were also conducted on multi-layered materials in which the composite plies were dispersed between more than two aluminium sheets. For a given target thickness, the multi-layered laminates offered a superior perforation resistance to the sandwich laminates. The perforation resistances of the various laminates investigated here were compared by determining the specific perforation energy (s.p.e) of each system. Here, the sandwich FMLs based on the low density SRPP core out-performed the multi-layer systems, offering s.p.e.’s roughly double that exhibited by a similar Kevlar-based laminate. A closer examination of the panels highlighted a number of failure mechanisms such as ductile tearing, delamination and fibre failure in the composite plies as well as permanent plastic deformation, thinning and shear fracture in the metal layers. Finally, the perforation threshold of all of the FML structures was predicted using the Reid–Wen perforation model. Here, it was found that the predictions offered by this simple model were in good agreement with the experimental data.
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Acknowledgments
The authors acknowledge the financial support of the Public Service Department (Malaysia) and Universiti Teknologi Malaysia. The authors are also grateful to Derek Riley of Propex Fabric for supplying the self-reinforced composite (Curv) and David Robinson and Professor Tony Johnson of Gluco Ltd., Leeds, UK for supplying the interlayer adhesive (Gluco), and to Mr. Peter Smith for his help in conducting the impact tests.
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Abdullah, M.R., Cantwell, W.J. (2012). The High Velocity Impact Response of Self-Reinforced Polypropylene Fibre Metal Laminates. In: Tamin, M. (eds) Damage and Fracture of Composite Materials and Structures. Advanced Structured Materials, vol 17. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23659-4_13
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DOI: https://doi.org/10.1007/978-3-642-23659-4_13
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