Implications of Gun Propellant Bed Rheology
Final rept. Dec 1990-Dec 1991
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Simulation of the interior ballistic cycle for certain gun systems can sometimes predict the growth of pressure waves to potentially dangerous amplitudes. Such predictions involve the propagation of large amplitude stress waves through a compressed aggregate of propellant grains. The fidelity of the simulation will depend upon the accuracy of the constitutive behavior assigned to the propellant bed. This report examines the current formulation in Goughs NOVA-series codes, and then explores the implications on effective wave propagation speed for two different materials a brittle crystalline material HMX and a double-base ball propellant. The results indicate the potential importance of solid-phase compressibility at stress levels above 100 MPa.
- Ammunition and Explosives