Compressively Pre-stressed Navy Relevant Laminated and Sandwich Composites Subjected to Ballistic Impact
Abstract
Assembled structures such as ship decks, walls, and masts are often times under different degrees of pre-stress or confinement. Structural composite integrity can be compromised when subjected to impacts from events such as wave slamming, tool drops, cargo handling, and ballistic fragments/projectiles. It has been shown by several researchers that when a highly pre-stressed structure is subjected to impact, the damaged area and impact response changes. The main focus of this study was the impact of compressively pre-stressed structures which can also be considered as compression-during-impact. The results showed that for various laminate configurations, there was a compressive pre-stress threshold above which impact damage caused more damage than witnessed in typical compression after impact (CAI) tests. Both fiberglass and carbon laminates pre-stressed to higher than 30% of ultimate compressive strength, failed from impact at 300 m/s; but the carbon laminates developed shear cracks above 10% of the ultimate compressive strength. The work is of benefit to naval and other composite designers to be able to account for failure envelopes under complex dynamic loading states, i.e. pre-stress and impact for various composite configurations.Book chapter for paper presented at Office of Naval Research (ONR) Workshop/Conference, June 23–24, 2011, Instit Clement Ader (ICA), Toulouse, France, Organized by – Serge Abrate, Bruno Castanié and Yapa D.S. Rajapakse.
Keywords
Sandwich composites High velocity impact Pre-stress CompressionNotes
Acknowledgements
We are grateful to support from the ONR Solid Mechanics program managed by Dr. Yapa D.S. Rajapakse, Office of Naval Research. Some aspects of the compression fixture for crashworthiness studies were funded through the Department of Energy, Graduate Automotive Technology Education (GATE) program and we gratefully acknowledge this support.
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