Thermochemical Erosion Modeling of Original M242/M919 Gun System.
1997
Sopok, Samuel | Pflegl, George | O'Hara, Peter | Dunn, Stuart | Coats, Douglas
This MACE gun barrel thermochemical erosion modeling code addresses wall degradations due to transformations, chemical reactions, and cracking coupled with pure mechanical erosion for the original M242/M919 gun system. This predictive tool provides gun system design information that is otherwise impractical. The A723, 0.002-inch plated chromium/A723, and 0.002-inch sputtered tantalum/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 original M242/M919 gun system predictions agree well with the standard wall heat transfer/ temperature profile code (FDHEAT) and actual measured gun system erosion data.
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