Abstract
Ceramics undergo a complex failure process when subjected to impact by a projectile. Projectile impacts on thick ceramic targets produce varying levels of comminution, cone cracking, and radial cracking. Sphere impacts result in limited penetration and comminution relative to projectiles with a longer aspect ratio, yet significant radial and cone cracking is produced, and it is similar to Hertzian indentation. Sphere impact is a good way to study ceramics and a good validation problem to study the ability of hydrocodes to predict the formation and extent of radial and cone fractures in ceramic materials. Experimental results from normal and oblique sphere impacts on hot-pressed boron carbide cylinders are reported. Oblique sphere impacts created curved cone cracks, which did not appear oriented perpendicular to the impact surface. Cone angles appear to be the same for normal and oblique impacts for the impact conditions tested. Hydrocode predictions captured some but not all of the experimentally observed features.
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Acknowledgements
The authors acknowledge the helpful comments of Brian Leavy (ARL) and his assistance with the KAYENTA material model for boron carbide, Debjoy Mallick, and the ALEGRA development team at Sandia National Laboratory. We also acknowledge Cyle Teal (ARL) for his work on the 10 flash X-ray system, the laboratory technicians at ARL for assisting in these experiments, and the Department of Defense High Performance Computing Modernization Program for a grant of processing time.
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Aydelotte, B., Schuster, B. (2016). Observation and Modeling of Cone Cracks in Ceramics. In: Song, B., Lamberson, L., Casem, D., Kimberley, J. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-22452-7_4
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DOI: https://doi.org/10.1007/978-3-319-22452-7_4
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