Gun Tube Surface Kinetics and Implications
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Current theories concerning gun tube erosion consider that erosion can occur under various conditions. Propellant product gases are known to react with the surface resulting in an altered surface material which may melt or pyrolyze due to a lower melting temperature than that of the gun steel and or weakened mechanical properties. Previous surface reaction studies by the authors used a generalized equilibrium scheme with a control volume analysis to represent surface reactions occurring during a cannon firing. This led to a post reaction treatment at the interface which incorporated the subsurface diffusion of species to limit the surface reaction. In this study, the surface reactions and rates are specified explicitly with published rates and guidance from fundamental molecular modeling results. The results demonstrate the utility of the employed surface reaction mechanism as well as the incorporation of finite rate surface kinetics.