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A More Rational Approach for Analyzing and Designing the Steel Cartridge and Chamber Interface
ROCK ISLAND ARSENAL IL GENERAL THOMAS J RODMAN LAB
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A nonlinear incremental elastoplastic solution technique has been developed to solve problems arising from the interaction of a steel-cased cartridge and a chamber. Both nonlinear material response and geometric nonlinearity have been considered in this investigation. Nonlinearity of material properties has been taken into account by use of theories of plasticity and Prandtls constitutive equations. An incremental loading procedure has been used to consider the large deformation of the cartridge case. The interaction of the steel-cased cartridge and the chamber of the gun has been parametrically studied. Guidance for the selection of design variables such as yield strength and strain-hardening properties of a cartridge case material, peak chamber pressure, cartridge configuration, the initial clearance between a case and a chamber, the configuration, and the material property of the chamber of a gun is graphically presented in this paper. The effects of yield strength and strain- hardening properties of material and peak chamber pressure on the functioning of a steel-cased cartridge in a chamber are illustrated.
APPROVED FOR PUBLIC RELEASE