Accession Number : ADA328554

Title :   Thermochemical Erosion Modeling of the 25-MM M242/M791 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 ; Pflegl, George ; Dunn, Stuart ; Coats, Douglas

PDF Url : ADA328554

Report Date : JUL 1997

Pagination or Media Count : 21

Abstract : The MACE gun barrel thermochemical erosion modeling code addresses wall degradations due to transformations, chemical reactions, and cracking coupled with pure mechanical erosion for the 25-mm M242/M791 gun system. This predictive tool provides gun system design information that is otherwise impractical. The nitrided A723 and 0.002-inch plated chromium/A723 wall materials are evaluated for erosion using the M242 Cycle A firing scenario. 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). This analysis provides wall material erosion predictions and comparisons (ablation, conduction, and erosion profiles) as a function of time, travel (customer-selected 6-inch, 12-inch, 30-inch), and number of rounds to barrel condemnation. These M242/M791 gun system predictions agree well with the standard wall heat transfer/temperature profile code (FDHEAT) and actual measured gun system erosion data.

Descriptors :   *GUN BARRELS, *EROSION, ABLATION, MECHANICAL PROPERTIES, THERMOCHEMISTRY, COMPUTER APPLICATIONS, CHROMIUM, CONDUCTION(HEAT TRANSFER).

Subject Categories : Computer Programming and Software
      Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE