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Published 2008 | Published
Book Section - Chapter Open

Flexural waves in fluid-filled tubes subject to axial impact

Abstract

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.

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.

Attached Files

Published - Inaba2009p8193Proceedings_Of_The_Asme_Pressure_Vessels_And_Piping_Conference_Vol_4.pdf

Files

Inaba2009p8193Proceedings_Of_The_Asme_Pressure_Vessels_And_Piping_Conference_Vol_4.pdf

Additional details

Created:
August 19, 2023
Modified:
October 20, 2023