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A Determination of the Wave Forms and Laws of Propagation and Dissipation of Ballistic Shock Waves

DuMond, Jesse W. M. and Cohen, E. Richard and Panofsky, W. K. H. and Deeds, Edward (1946) A Determination of the Wave Forms and Laws of Propagation and Dissipation of Ballistic Shock Waves. Journal of the Acoustical Society of America, 18 (1). pp. 97-118. ISSN 0001-4966. http://resolver.caltech.edu/CaltechAUTHORS:20140624-111542495

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Abstract

Experiments to ascertain the wave forms and laws of propagation and dissipation of ballistic shock waves to large distances (80 yards) from the bullet trajectory are described. Calibers 0.30, 0.50, 20 mm, and 40 mm were studied. In every case an N‐shaped wave profile was observed consisting of a sudden rise in pressure, the “head discontinuity,” followed by an approximately linear decline to a pressure about equally far below atmospheric and then a second sudden return, the “tail discontinuity,” to atmospheric pressure. The peak amplitudes of this disturbance are found to diminish about as the inverse 3/4 power of the miss‐distance (perpendicular distance from the trajectory) while the period T′ (measured between the discontinuous fronts) increases about as the 1/4 power of the miss‐distance for calibers 0.30, 0.50, and 20 mm. For 40‐mm shells the amplitude decays a little faster, about as the inverse 0.9 power of miss‐distance over the range studied. A theory taking account of the dissipation of the N‐wave energy into heat is developed to explain the observed behavior. A method of measuring absolute N‐wave amplitudes by observing the rate of change of period T′ with propagation is described. The theory leads to an absolute relationship at large distances between distance, amplitude, and period in which no arbitrary constants appear.


Item Type:Article
Related URLs:
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http://dx.doi.org/10.1121/1.1916347 DOIArticle
http://scitation.aip.org/content/asa/journal/jasa/18/1/10.1121/1.1916347PublisherArticle
Additional Information:© 1946 Acoustical Society of America. Received 27 September 1945. This paper is based on work done for the Office of Scientific Research and Development under Contract No. OEMsr-600 with the California Institute of Technology
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Office of Scientific Research and DevelopmentOEMsr-600
Record Number:CaltechAUTHORS:20140624-111542495
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140624-111542495
Official Citation:A Determination of the Wave Forms and Laws of Propagation and Dissipation of Ballistic Shock Waves DuMond, Jesse W. M. and Cohen, E. Richard and Panofsky, W. K. H. and Deeds, Edward, The Journal of the Acoustical Society of America, 18, 97-118 (1946), DOI:http://dx.doi.org/10.1121/1.1916347
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46470
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Jun 2014 20:04
Last Modified:24 Jun 2014 20:04

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