Barrel Erosion Rate of a 60mm Gun.
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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The 60mm gun, BG3, used in the Anti-Armor Automatic Cannon Technology Program AAAC, fired 69 rounds with various wear-reducing additives. The wear rate per round measured on the vertical land diameter 20.75 inches 527mm from the rear face of the tube was 0.7-0.8 milrd 0.018-0.020 mmrd for each additive configuration. In order to test the hypothesis that the various additives were not affecting the wear rate of the cannon, ten rounds were fired without any additives. The wear rate increased to 2.0 milsrd 0.051 mmrd. The ten round group was followed by a five round series with additive which showed the same low wear rate seen in the first 69 rounds. The wear profile of the MC-AAAC cannon is similar to the wear profile of the 105mm M68 tank cannon firing rounds without additive. However, the MC-AAAC did not have a secondary wear peak. The wear rate without additive was predicted reasonably well by both the Frankle and Smith-OBrasky models. The Smith-OBrasky model, which has a correction to the propellant flame temperature to account for the presence of the wear-reducing additive, correctly predicted the wear rate of the MC-AAAC with the additive. Author