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Numerical Simulation of the In-Bore Motion of a Typical Artillery Shell and Investigation of Balloting

Numerical simulation of projectile motion inside the gun barrel for large calibre gun is a less explored field of study. The projectile behaviour inside the gun is important for both designing of projectile and the gun system. In this study an attempt has been made to model the motion of typical artillery shell in rifled bore of 155mm gun. A 3D finite element model was developed for the rifled barrel and projectile assembly. The simulated muzzle velocity was compared with experimental velocities and appreciable closeness was achieved. To investigate the balloting of the projectile inside the bore, a density-based eccentricity of the centre of gravity was introduced in the projectile. The balloting motion has been clearly demonstrated resulting in engravement on the shell body.