Experimental Determination of Critical Physical Parameters Affecting JA2 Propellant Grain Response. Phase 1. Screening Design
Final rept. Aug-Dec 1990
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Uniaxial compression tests are performed on single grain, seven- perforation JA2 propellant specimens using a statistically-based, 24 factorial design strategy. A total of sixteen tests are performed and a mechanical response surface is generated over the range of continuous variables, strain rate 10-4 and 500 sec-1, temperature 0 and 60 degrees Celsius, and specimen aspect ratio 0.8 and 1.3, and discrete variable, specimen end lubrication yes or no . It is found that specimen end lubrication reduces the variability of the mechanical response of JA2 but does not affect the magnitude of the mechanical response as characterized by the yield stress, yield strain, compressive modulus, and strain energy absorbed at yield. The specimen aspect ratio did not affect the mechanical response of JA2 because of the limited aspect ratio range investigated.
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