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Download or read book Erosion Modeling of the High Contraction Chromium Plated Crusader Gun System written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal-chemical- mechanical erosion modeling predictions are given for the high contraction chromium plated Crusader gun system based on extensive cannon firing, inspection, characterization, and experimental data. This effort was conducted for the Army's Crusader Program Manager Office and managed by Applied Ordnance Technology. The authors carefully protect proprietary technical data that was provided by various government and nongovernment partners involved in this effort. Key gun system details include the 155-mm 56 caliber rifled XM297 cannon with a 1400 In(3) chamber, zone six combustible case-type modular artillery charge, triple-base propellant, an approximately 100-pound M549-like projectile, its nominal obturator, maximum chamber pressure of approximately 55 kpsi, 0.005-inch thick high contraction chromium plate on both the lands and grooves of the steel, ambient temperature conditioning, no in-wall barrel cooling, decopperlng and flash additives, and no wear additives. This XM297 gun system can be condemned on erosion due to loss of velocity, fuse malfunction, rotating band wear, excessive body engraving, and loss of accuracy. A provisional 0.105-inch diametric origin erosion limit (usually at 12:00 to 6:00 peak) applies in the absence of these condemning effects as measured by pullover or star gages. Most key cannons were near this provisional diametric erosion limit and were destructively characterized resulting in moderately high confidence erosion predictions. Thermal and erosion predictions are made for five different firing rate scenarios from 1 round per hour to 8 rounds per minute. For the I round per hour firing rate scenario, we predict that it requires approximately 1520 EFCs to achieve arbitrary 0.100-inch wall erosion at the 12:00 o'clock peak eroded origin position and 1005 EFCs to achieve arbitrary 0.100-inch diametric erosion at the 12:00 to 6:00 o'clock peak eroded origin position.