This paper describes a numerical analysis of the swaging autofrettage of a gun barrel by forcing an oversize mandrel (or “swage”) through the barrel. Analyses are conducted on a two pass swaging procedure in which two separate swages are driven through the barrel. Differences between the maximum swage force required and the resulting barrel deformations and stresses that result from single and two pass swaging are discussed. The effects of changes to swage geometry for single pass swaging are also considered.

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