Thermal Analysis for a 37-mm Gun Chamber With Ceramic Nozzles

Report No. ARL-MR-624
Authors: Xiaogang Huang, James Garner, and Paul Conroy
Date/Pages: September 2005; 24 pages
Abstract: The 37-mm interior ballistics chamber is primarily a test bed to evaluate new propellant properties and their effects on gun systems. Experiments were conducted examining the properties of various ceramics under realistic interior ballistic loadings. The thermal response during the launch will cause stresses due to the large temperature gradient and coefficient of thermal expansion mismatch between the ceramic nozzle and steel gun chamber. In the first step of the investigation, it is essential to determine the thermal stress created. This report details the finite-element model used to predict the thermal response of the chamber and selected ceramic nozzle samples to better understand the sources or modes of failure observed in chamber firings. These results are essential in guiding the selection of nozzle materials and research into the use of ceramics in a gun chamber.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2005