Accession Number : AD0730530

Title :   Depth Dependence of Bubble Pulse Periods of Point and End-Fired Line Charges,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)

Personal Author(s) : Adlington,R. H. ; Moldon,J. C. ; Wentzell,R. A.

Report Date : 13 JUL 1970

Pagination or Media Count : 4

Abstract : A theory of the depth dependence of the first bubble pulse period of an infinitely long cylindrical charge is developed. The charge is represented by a cylinder of adiabatic gas and the time equation for expansion from its initial radius to equilibrium is derived as a function of the weight of explosive per unit length and the hydrostatic head. Theoretical results are compared with measured bubble pulse periods of end-fired line charges detonated at depths between 90 and 10,600 ft. The length-to-diameter ratio of the charges varied from 45 to 320 and the weight of explosive per unit length varied from 0.11 to 0.43 lb/ft. There is substantial agreement between theory and experiment, the agreement improving as the length-to-diameter ratio of the charge increases. (Author)

Descriptors :   (*UNDERWATER EXPLOSIONS, EXPLOSION EFFECTS), RDX, DETONATING CORD, UNDERWATER SOUND, SHOCK WAVES

Subject Categories : Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE