Ablative Erosion Model for the M256/M829E3 Gun System
Abstract
A combination of bore-protecting ablative and bore-coating technologies is necessary to reduce erosion for current and future high-performance gun systems. Our cannon coating erosion model developed in 1996 is fully capable of incorporating the added complexity of bore-protecting ablatives. Both nonablative and ablative results from this model have been published for a number of important Army and Navy gun systems with bore coatings. This erosion model is guided and calibrated and correlates very well with substantial gun system firing data and subsequent laboratory analysis of fired specimens. Additionally, the model uses measured ablative flow and thermal decomposition data to determine the ablative mechanisms and guide/calibrate ablative modeling. The purpose of this report is to show how our ablative model incorporates into our overall cannon coating erosion code by using the experimental ablative M256/MS29E3 gun system as an illustrative example. Although we do not have authority to release the composition and processing of this proprietary ablative paste, we do have authority to release its general thermal decomposition, flow characteristics, and ablative mechanism data. These decomposition, flow, and ablative mechanism data are used by the thermochemical, boundary layer, and thermal and erosion modeling codes to include the effect of the ablative paste and its associated thermal decomposition products. Experimental ablative M829E3 rounds-to-erosion condemnation at the peak eroded 1.6-meter from the rear face of the tube position determines this gun system's predicted erosion life. At that position, the respective 49 deg C, 21 deg C, and -32 deg C round-conditioning temperature cases achieve predicted erosion condemnation at approximately 240, 390, and 350 rounds.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2001
- Accession Number
- ADA392147
Entities
People
- Mark Fleszar
- Samuel Sopok
Organizations
- United States Army Armament Research, Development and Engineering Center