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Experimental investigation of converging shocks in water with various confinement materials

Eliasson, V. and Mello, M. and Rosakis, A. J. and Dimotakis, P. E. (2010) Experimental investigation of converging shocks in water with various confinement materials. Shock Waves, 20 (5). pp. 395-408. ISSN 0938-1287 . http://resolver.caltech.edu/CaltechAUTHORS:20101026-111445870

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Abstract

Fluid-solid coupling typically plays a negligible role in confined converging shocks in gases because of the rigidity of the surrounding material and large acoustic impedance mismatch of wave propagation between it and the gas. However, this is not true for converging shocks in a liquid. In the latter case, the coupling can not be ignored and properties of the surrounding material have a direct influence on wave propagation. In shock focusing in water confined in a solid convergent geometry, the shock in the liquid transmits to the solid and both transverse and longitudinal waves propagate in the solid. Shock focusing in water for three types of confinement materials has been studied experimentally with schlieren and photoelasticity optical techniques. A projectile from a gas gun impacts a liquid contained in a solid convergent geometry. The impact produces a shock wave in water that develops even higher pressure when focused in the vicinity of the apex. Depending on the confining material, the shock speed in the water can be slower, faster, or in between wave speeds in the solid. For solid materials with higher wave speeds than the shock in water, regions in the water is put in tension and cavitation occurs. Materials with slower wave speeds will deform easily.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s00193-010-0276-9DOIUNSPECIFIED
http://www.springerlink.com/content/h1488172q030r028/PublisherUNSPECIFIED
Additional Information:© 2010 Springer-Verlag. Received: 8 February 2010. Revised: 26 May 2010. Accepted: 18 August 2010. Published online: 2 September 2010. The authors gratefully acknowledge the support of the Office of Naval Research through a MURI Grant Number N00014-06-1-0730 (Dr. Y.D.S. Rajapakse, Program Manager) to the California Institute of Technology. The authors wish to thank Dr. A.A. Shapiro at NASA/JPL for providing and preparing the Solithane cores used in the experiments, the Caltech Aero machine shop, Dr. Chris Bond, Dr. David Hill, Dr. Dan Lang, and Mr. Bahram Valiferdowsi.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-06-1-0730
Subject Keywords:Shock focusing; Impact; Water; Solid; Schlieren; Photoelasticity
Record Number:CaltechAUTHORS:20101026-111445870
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101026-111445870
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20537
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Nov 2010 22:15
Last Modified:05 Jan 2017 00:24

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