Machine Gun Liner Bond Strength

Report No. ARL-CR-595
Authors: William S. de Rosset; Jonathan S. Montgomery
Date/Pages: August 2007; 32 pages
Abstract: Bond strengths of two Stellite 21 liners in the M2 0.50-cal. machine gun have been measured. Both liners were obtained from machine-gun barrels that had been retired from service. Liner bond strength from one of the barrels was measured to be ~750 psi. The other liner fell out of the barrel during sectioning, and its bond strength was much lower. Simple calculations showed that a bond strength of 750 psi was compatible with a shrink-fit process. In this case, the bond strength was shown to be sufficient to resist the forces on the lands and grooves of the liner due to spin-up forces on the bullet.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2007