Correlation of Small Scale Laboratory Tests with Bullet Impact Testing of Rocket Motors.
WEAPONS SYSTEMS RESEARCH LAB ADELAIDE (AUSTRALIA)
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Testing of munitions for their response to the various stimuli under consideration in the insensitive munitions program is expensive and time consuming. Because there is a degree of variability in the responses, particularly in fast cook off and fragment impact, large scale tests give results which at best give only a limited indication of the likely response. It is thus desirable to have small scale tests, which can be performed many times, taking into account the probability of a response. In order to examine the extent to which these tests could be used to predict the response of rocket motors to projectile attack, a series of field trials on rocket motors was undertaken. Bullet impact testing was performed to determine the relevance of the results from the Hopkins Bar and the Shotgun tests developed in an earlier study. The effects of propellant type, temperature, bullet, type, case material and grain configuration were investigated. Results from PZT gauges embedded in the propellant grain appear to be indicative of the extent of reaction, that is, whether DDT Deflagration to Detonation Transition has occurred, and the amount of residual impact energy in the rocket motor. The fair degree of correlation between the small-scale tests and the bullet impact field trials suggest that the small scale test are relevant to bullet or fragment ignition effects.
- Rocket Propellants