Correlation of the Failure Modulus to Fracture-Generated Surface Area in Uniaxially Compressed M30 Gun Propellant
Final rept. Nov 92-Apr 93,
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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M30, a triple base large caliber propellant, was uniaxially compressed at a rate of 100s to an end state strain of 50.0, 20.0, and 10.0 at temperatures from -40 to 60 degrees C. The failure modulus was measured, and closed bomb firings were made to determine how the grain damage affected the pressure generation. The pressure-time curves from the damaged propellant were analyzed to extract the burning surface area profiles. Results showed that a line fit to the first 10 of the surface area versus fraction burned curve seemed to be directly related to the logarithm of the failure modulus. The three resulting least square fit curves, one for each level of strain, fell into a series that permitted the effective surface area profile to be predicted for any combination of failure modulus and end state strain within the fracture domain. These results provide a method for assessing fracture damage by means of a simple mechanical measurement. Mechanical response, Surface area, Fracture damage, Propellants, M30, Failure modulus, Failure.
- Ammunition and Explosives
- Combustion and Ignition