Erosion EFC Factors for Kinetic Energy Rounds Used in the 120-mm M256 Tank Cannon
Abstract
The U.S. Army and Air Force's standard manual for the evaluation of cannon tubes designates fatigue condemnation criteria for each cannon tube type. It also designates erosion condemnation criteria for each cannon tube type, and designates a cartridge/zone fatigue effective full charge (EFC) factor for each charge/projectile combination. These criteria help in cannon inventory management. However, the manual lacks a designated cartridge/zone erosion EFC factor for each charge/projectile combination. This represents a notable technology gap for tank and artillery cannon systems, since erosion condemnation occurs much quicker than fatigue condemnation when using the latest charge/projectile combinations. Our report outlines a detailed computational and experimental method using the Unified Cannon Erosion Code to compute a cartridge or round erosion EFC factor for the M865, M829, M829A1, and M829A2 kinetic energy round types used in the 120-mm M256 tank cannon at multiple round-conditioning temperatures. Our report further outlines the obvious extension of this method to any group of charge/projectile combinations used in a specific tank or artillery cannon. The following erosion EFC factors are based on an erosion EFC factor of 1.0 for the M865 round type at a 21 deg C round-conditioning temperature as requested by PM-TMAS. These erosion factors correspond to a peak erosion location approximately 2.2 meters from the rear face of the tube. For the M865, M829, M829A1, and M829A2 round types at a 49 deg C round-conditioning temperature, the respective erosion EFC factors are approximately 1.5, 4.2, 5.0, and 6.3. Similarly, the respective erosion EFC factors are approximately 1.0, 2.8, 3.3, and 4.2 at a 21 deg C round-conditioning temperature, and the respective erosion EFC factors are approximately 0.7, 1.9, 2.2, and 2.8 at a -32 deg C round-conditioning temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2000
- Accession Number
- ADA372760
Entities
People
- Roger Billington
- Samuel Sopok
Organizations
- United States Army Armament Research, Development and Engineering Center