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 thicknesses of 0.8 mm, 6.4 mm, and 12.7 mm. A steel impactor was accelerated using an air cannon and struck a polycarbonate buffer placed on top of the 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 mm 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 the predicted and measured peak strains as a function of the impact buffer speed (1956, “An Extension to the Theory of Water Hammer,” Trans. ASME, 78, pp. 105–116). For thick-walled tubes, the correlation between the experimentally determined peak pressures and strains reveals the importance of corrections for the through-wall stress distribution.
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e-mail: inaba@mech.titech.ac.jp
e-mail: joseph.e.shepherd@caltech.edu
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April 2010
Research Papers
Flexural Waves in Fluid-Filled Tubes Subject to Axial Impact
Kazuaki Inaba,
Kazuaki Inaba
Graduate Aeronautical Laboratories,
e-mail: inaba@mech.titech.ac.jp
California Institute of Technology
, Pasadena, CA 91125
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Joseph E. Shepherd
Joseph E. Shepherd
Graduate Aeronautical Laboratories,
e-mail: joseph.e.shepherd@caltech.edu
California Institute of Technology
, Pasadena, CA 91125
Search for other works by this author on:
Kazuaki Inaba
Graduate Aeronautical Laboratories,
California Institute of Technology
, Pasadena, CA 91125e-mail: inaba@mech.titech.ac.jp
Joseph E. Shepherd
Graduate Aeronautical Laboratories,
California Institute of Technology
, Pasadena, CA 91125e-mail: joseph.e.shepherd@caltech.edu
J. Pressure Vessel Technol. Apr 2010, 132(2): 021302 (8 pages)
Published Online: January 29, 2010
Article history
Received:
September 29, 2008
Revised:
June 22, 2009
Online:
January 29, 2010
Published:
January 29, 2010
Citation
Inaba, K., and Shepherd, J. E. (January 29, 2010). "Flexural Waves in Fluid-Filled Tubes Subject to Axial Impact." ASME. J. Pressure Vessel Technol. April 2010; 132(2): 021302. https://doi.org/10.1115/1.4000510
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