Abstract
Impact damage reduces the structural integrity and load bearing capacity of a composite structure. Most studies on high velocity impact damage have been limited to single-site impacts, with little consideration given to the effect of cumulative damage from multiple impacts. In this study, the impact damage response of S2-glass/epoxy balsa wood core sandwich composite is evaluated experimentally and supported by finite element modeling for single-site and multi-site impacts from 0.30 and 0.50 caliber spherical projectiles. During high velocity impact, a composite laminate undergoes progressive damage;hence a progressive failure model based on Hashin's criteria is used to predict failure. When subjected to multi-site impact loading, a sandwich composite structure exhibits synergistic and cumulative damage causing extensive fiber breakage, matrix cracking and delamination. An excellent correlation between experimental and numerical results is obtained.
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Acknowledgment
The support provided by Office of Naval Research (ONR), Program Manager —Dr. Yapa Rajapakse is gratefully acknowledged. We also acknowledge Dr. Frederick Just-Agosto and Dr. Basir Shafiq from the University of Puerto Rico, Mayaguez.
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Vaidya, U.K., Deka, L.J. (2009). Single and Multisite Impact Response of S2-Glass/Epoxy Balsa Wood Core Sandwich Composites. In: Daniel, I.M., Gdoutos, E.E., Rajapakse, Y.D.S. (eds) Major Accomplishments in Composite Materials and Sandwich Structures. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3141-9_21
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DOI: https://doi.org/10.1007/978-90-481-3141-9_21
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