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Shockwaves in converging geometries

Brown, J. L. and Ravichandran, G. (2009) Shockwaves in converging geometries. In: Shock-induced spall in copper: The effects of anisotropy, temperature, defects and loading pulse. AIP Conference Proceedings . No.1195. American Institute of Physics , pp. 747-750. ISBN 978-0-7354-0732-9 . http://resolver.caltech.edu/CaltechAUTHORS:20100621-150110109

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Abstract

Plate impact experiments are a powerful tool in equation of state (EOS) development, but are inherently limited by the range of impact velocities accessible to the gun. In an effort to dramatically increase the range of pressures which can be studied with available impact velocities, a new experimental technique is being developed. The possibility of using a confined converging target to focus Shockwaves and produce a large amplitude pressure pulse is examined. When the planar shock resulting from impact enters the converging target the impedance mismatch at the boundary of the confinement produces reflected Mach waves and the subsequent wave interactions produce a diffraction cycle resulting in increases in the shock strength with each cycle. Since this configuration is limited to relatively low impedance targets, a second technique is proposed in which the target is two concentric cylinders designed such that the inner cylinder will have a lower shock velocity than the much larger shock velocity in the outer cylinder. The resulting dispersion in the wave front creates converging shocks, which will interact and eventually result in a steady Mach configuration with an increase in pressure in the Mach disk. Numerical simulations indicate a significant increase in pressure for both methods and show promise for the proposed concepts.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.3295249 DOIArticle
http://link.aip.org/link/?APCPCS/1195/747/1PublisherArticle
Additional Information:© 2009 American Institute of Physics. The research support provided by the Caltech Center for the Predictive Modeling and Simulation of High-Energy Density Dynamic Response of Materials through the U.S. Department of Energy contract DE-FC52-08NA28613 is gratefully acknowledged.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Department of Energy (DOE) National Nuclear Security AdministrationDE-FC52-08NA28613
Subject Keywords:Converging shocks; Mach reflection; EOS
Classification Code:PACS: 82.40.Fp; 62.20.F-; 02.60.-x.
Record Number:CaltechAUTHORS:20100621-150110109
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100621-150110109
Official Citation:SHOCKWAVES IN CONVERGING GEOMETRIES J. L. Brown and G. Ravichandran, AIP Conf. Proc. 1195, 747 (2009), DOI:10.1063/1.3295249
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18757
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Aug 2010 22:18
Last Modified:29 Sep 2016 23:16

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