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Flexural waves in fluid-filled tubes subject to axial impact

Inaba, Kazuaki and Shepherd, Joseph E. (2008) Flexural waves in fluid-filled tubes subject to axial impact. In: Proceedings of the ASME Pressure Vessels and Piping Conference, Vol. 4. ASME , pp. 273-282. ISBN 978-0-7918-4827-2.

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We experimentally studied the propagation of coupled fluid stress waves and tube flexural waves generated through projectile impact along the axis of a water filled tube. We tested mild steel tubes, 38-40 mm inner diameter and wall thickness of 0.8, 6.4, and 12.7 mm. A steel impactor was accelerated using an air cannon and struck a polycarbonate buffer placed on the top water surface within the tube. Elastic flexural waves were observed for impact speeds of 5-10 m/s and plastic waves appeared for impact speeds approaching 20 m/s for a 0.8 mm thickness tube. We observed primary wave speeds of 1100 m/s in a 0.8 mm thickness tube, increasing to the water sound speed with 6.4 and 12.7 mm thickness tubes. Comparison of our measurements in the 0.8 mm thickness tube with Skalak's water hammer theory indicates reasonable agreement between predicted and measured peak strains as a function of the impact buffer speed. For thick-wall tubes, the correlation between experimentally determined peak pressures and strains reveals the importance of corrections for the through-wall stress distribution.

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Shepherd, Joseph E.0000-0003-3181-9310
Additional Information:© 2008 ASME. This research was sponsored by the Office of Naval Research, DOD MURI on Mechanics and Mechanisms of Impulse Loading, Damage and Failure of Marine Structures and Materials (ONR Grant No. N00014-06-1-0730), program manager Dr. Y. D. S. Rajapakse. We thanks Chris Krok for his work on the first generation of experiments and Tim Curran for his work on data processing and image analysis.
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Office of Naval Research (ONR)N00014-06-1-0730
Record Number:CaltechAUTHORS:20100618-095626855
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18731
Deposited By: Tony Diaz
Deposited On:09 Jul 2010 21:19
Last Modified:08 Nov 2021 23:46

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