Abstract
The dynamic compressive strength of ceramic armor materials is difficult to obtain experimentally due to the sensitivity of fracture strength to small misalignments, end effects, and surface effects. In this work we introduce a spherical joint into a compression Kolsky bar to investigate whether the joint can alleviate bending stresses due to minor misalignment in compression tests on alumina dumbbell specimens. Tests are conducted both with and without the spherical joint, and high-speed (75,000 frames/s) three-dimensional Digital Image Correlation (3D DIC) is used to measure both the strain field on the dumbbell specimen and motion, if any, in the spherical joint. Results indicate that the spherical joint is extremely sensitive to eccentric loading and in most cases increases rather than decreases the bending stresses in the test, leading to lower apparent fracture strengths.
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Certain commercial equipment, instruments, or materials are identified in this paper to specify the experimental procedure adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the materials or equipment identified are necessarily the best available for the purpose.
References
Chen, W., Song, B.: Split Hopkinson (Kolsky) Bar: Design, Testing and Applications, p. 2011, New York (2011). ISSN 0941-5122
Jones, E.M.C., Iadicola, M.A.: A Good Practices Guide for Digital Image Correlation. s.l. International Digital Image Correlation Society (2018)
Acknowledgement
Dr. Jeffrey Swab, U.S. Army RDECOM, for inviting us to participate in the round robin and for valuable discussions.
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© 2020 Society for Experimental Mechanics, Inc.
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Mates, S., Rhorer, R., Quinn, G. (2020). Dynamic Compressive Tests of Alumina Dumbbells Using a Spherical Joint. In: Lamberson, L. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-30021-0_21
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DOI: https://doi.org/10.1007/978-3-030-30021-0_21
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Publisher Name: Springer, Cham
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Online ISBN: 978-3-030-30021-0
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