Accession Number : ADA325610

Title :   Erosion Modeling of the 120-MM M256/M829A2 Gun System.

Descriptive Note : Final rept.,

Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS

Personal Author(s) : Sopok, Samuel ; O'Hara, Peter ; Vottis, Patrick ; Pflegl, George ; Rickard, Christopher

PDF Url : ADA325610

Report Date : APR 1997

Pagination or Media Count : 30

Abstract : The Benet Laboratories/Software and Engineering Associates, Inc. (SEA) gun barrel erosion modeling and design code predicts wall degradation due to transformations, chemical reactions, and cracking coupled with pure mechanical erosion for the 120-man M256/MS29A2 gun system for ambient temperature-conditioned rounds. The A723 steel and 0.005-inch high contraction (HC) chromium plated/A723 steel wall materials are evaluated for erosion. This complex computer analysis is based on rigorously evaluated scientific theory that has been validated in the rocket community over the last forty years. Our gun erosion analysis includes the standard interior ballistics gun code (XNOVAKTC), the standard nonideal gas-wall thermochemical rocket code modified for guns (CCET). the standard mass addition boundary layer rocket code modified for guns (MABL), and the standard wall material ablation conduction erosion rocket code modified for guns (MACE). In addition, bore subsurface metallographic analysis and projectile-bore finite element analysis (ABAQUS) are considered. Our overall analysis provides wall material erosion predictions and comparisons of ablation, conduction, and erosion profiles as a function of time, travel (customer-selected 27. 61, 86, 130, and 201 inches from the rear face of the tube), and number of rounds to barrel condemnation. The 120-mm M256/M829A2 gun system prediction, with significant numbers of M829A2 rounds, agrees well with the wear and erosion pattern of retired M256 gun barrels.

Descriptors :   *GUN BARRELS, *GUNS, COMPUTER PROGRAMS, ABLATION, MECHANICAL PROPERTIES, DEGRADATION, PREDICTIONS, MATERIALS, CRACKS, THEORY, EROSION, PURITY, PROFILES, CHEMICAL REACTIONS, PATTERNS, WALLS, COMPUTER APPLICATIONS, SUBSURFACE, METALLOGRAPHY, BORES.

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE