Accession Number : ADA180244

Title :   The Use of Deformation Markings to Estimate the Launch Accelerations Experienced by the Phalanx Round,

Corporate Author : MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)

Personal Author(s) : Woodward,R ; Baxter,B ; Johnston,I R ; O'Donnell,R G ; Pattie,S D

PDF Url : ADA180244

Report Date : Jan 1987

Pagination or Media Count : 23

Abstract : When a projectile is accelerated in a gun barrel it is subjected to external forces from the propellant combustion gases and interaction with the barrel, and to body forces which arise due to the acceleration and motion of the projectile. The forces result in stressing of the projectile components and for safe launch it is required that the stresses do not lead to fracture or gross yielding of the projectile. Various analytical, semi-empirical and finite element techniques have been used for launch stress evaluation, however there is a degree of uncertainty in the results because of the difficulty of obtaining experimental data during projectile launch. This work outlines a technique applied to the Phalanx projectile which is fired from the Vulcan gun system. Measurements were made on deformation marks in the pushers from launched Phalanx rounds and compared with similar marks from quasi-static tests to estimate the maximum force and torque between the penetrators and pusher at launch. It is demonstrated that these data can be combined with piezo-electric pressure data to estimate the maximum values of axial and circumferential accelerations, forces and circumferential torques. Keywords: Accelerometers; Phalanx projectiles; Indentation. (Australia)

Descriptors :   *ACCELERATION, *DEFORMATION, *PROJECTILES, AUSTRALIA, MARKERS, GUN BARRELS, LAUNCHING, STRESSES, TEST AND EVALUATION, MOTION, PROJECTILE COMPONENTS, FINITE ELEMENT ANALYSIS, FRACTURE(MECHANICS), PENETRATION, ANTIAIRCRAFT GUNS, COMBUSTION PRODUCTS, GASES, PROPELLANTS, SAFETY, TORQUE

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE