Abstract
Ball impact experiments were conducted on unstrengthened and strengthened glass bars at 261 and 345m/s, respectively. Damage propagation was recorded using a high-speed camera at frame rates of 281,000 frames per second. Immediately after the ball impact on the unstrengthened glass, the damage front reached a maximum velocity of 1,967m/s before falling to zero within a short distance. However, the longitudinal wave created due to the impact continued down the bar towards the rear-end. Upon reflection from the rear-end of the bar, a secondary damage front was initiated at 3,192m/s, which eventually arrested. On the other hand, the damage front in the strengthened glass reached a maximum of 2,275m/s immediately after impact, and then stabilized at 1,921m/s until the bar was consumed. It was determined that the stored elastic energy in the strengthened glass fueled the self-sustained damage and allowed it to propagate at a near constant rate. For both glasses, high-speed imaging allowed for observation of energy dissipation modes such as fracture propagation (fracture surface area), radial bar dilation, and high velocity jetting of fine glass particles at the impact site. In addition to the triangular dilation observed in the unstrengthened glass at the impact site, the strengthening process also led to uniform dilation of the entire rod.
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References
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Acknowledgements
The authors are thankful to Dr. Arun Varshneya of Saxon Glass Technologies, Inc., for supplying the glass specimens used in this study. Financial support from the National Defense Science and Engineering Graduate Fellowship program for Phillip Jannotti is also sincerely acknowledged.
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© 2014 The Society for Experimental Mechanics, Inc.
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Jannotti, P., Subhash, G. (2014). Damage Mechanisms of Chemically Strengthened Glass Bars Due to High-Velocity Ball Impact. In: Jin, H., Sciammarella, C., Yoshida, S., Lamberti, L. (eds) Advancement of Optical Methods in Experimental Mechanics, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00768-7_24
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DOI: https://doi.org/10.1007/978-3-319-00768-7_24
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