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Dynamic Buckling of Submerged Tubes due to Impulsive External Pressure

Bitter, Neal P. and Shepherd, Joseph E. (2013) Dynamic Buckling of Submerged Tubes due to Impulsive External Pressure. In: Dynamic Behavior of Materials. Vol.1. Springer , Cham, Switzerland, pp. 225-236. ISBN 978-3-319-00770-0.

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An annular geometry is used to experimentally study fluid-structure interaction and dynamic buckling of tubes submerged in water and subjected to axially-propagating pressure waves. Wave propagation, vibration, and buckling of the specimen tubes are characterized using pressure and strain measurements. Emphasis is placed on pressures near or slightly exceeding the buckling threshold, where buckling deformation is excited but remains elastic or only slightly plastic due to the short duration of the pressure pulse. Measured wave speeds and non-axisymmetric vibration frequencies are in good agreement with predictions from simple fluid-structure interaction models. Near the buckling threshold, the amplitude of non-axisymmetric deformation is observed to grow rapidly with small increases in pressure until plastic deformation occurs, which results in a substantial loss of strength of the tube. Systematic mode 2 variations in wall thickness are found to control the buckle orientation, since the major axis of mode 2 buckles is always aligned with the location where the tube wall is thinnest.

Item Type:Book Section
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Shepherd, Joseph E.0000-0003-3181-9310
Additional Information:© 2014 The Society for Experimental Mechanics, Inc. First Online: 22 August 2013. This research was supported 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. Tomohiro Nishiyama of the Japan Patent Office and Prof. Kazuaki Inaba, currently at the Tokyo Institute of Technology, executed the initial design of the annular tube implosion fixture and supervised its fabrication while working at Caltech. Preliminary experiments on buckling using this facility were conducted by Mr. Jason Damazo and Dr. Rafal Porowski, currently at the research Center for Fire Protection in Poland. We are also grateful to Prof. Ravichandran of Caltech, who provided technical advice and leadership of the Caltech MURI.
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-06-1-0730
Subject Keywords:Dynamic buckling; Fluid-structure interaction; Buckling threshold; Imperfect structures; Impulsive loads
Record Number:CaltechAUTHORS:20170706-084659680
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78794
Deposited By: Tony Diaz
Deposited On:06 Jul 2017 22:18
Last Modified:15 Nov 2021 17:43

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