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VARIATIONS IN BOLT FACE FORCES IN SMALL CALIBER WEAPON SYSTEMS DUE TO CARTRIDGE CASE MATERIAL
Abstract
When a round is fired in small arms applications the pressure in the cartridge case imparts significant force on the bolt face and in turn the bolt lugs. As several efforts are underway to replace brass with lighter or stronger materials it is of utmost importance to characterize how these materials effect the forces seen by the bolt face. In this report a test fixture is developed that can measure the force seen by the bolt during firing. Modeling is also performed to determine its predictive capability in this application. It is shown that the cartridge case material has a significant effect on bolt face forces. Based on material selection bolt face forces can increase by approximately 66% for a similar pressure load. It is further shown that Finite Element Analysis is a useful tool in predicting bolt face forces within 10% of live fire testing.
DOI
10.12783/ballistics22/36086
10.12783/ballistics22/36086
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