A 37-mm Ceramic Gun Nozzle Stress Analysis

Report No. ARL-TR-3804
Authors: Xiaogang Huang, James Garner, and Paul Conroy
Date/Pages: May 2006; 28 pages
Abstract: A series of shooting tests was conducted on a 37-mm gun fixture with ceramic nozzles. The primary concern for the design and test of the ceramic nozzle is the combination of the thermal stress and dynamic ballistic stress during the launch. On the basis of previous thermal analysis, a transient sequentially coupled finite-element model is performed to investigate the thermal stresses due to the large temperature gradient and coefficient mismatch of thermal expansion between the ceramic nozzle and the steel holder. The fully-coupled thermal stress analysis is conducted for verification. A DYNA3D model is used to perform the dynamic stress analysis due to the interior ballistic load on the ceramic nozzle. Three candidate ceramic materials, SN47, STK4, and ZRO2, are investigated and compared with the conventional steel nozzle. All the stress components from both thermal and dynamic loads are determined. These predictions are significant to the selected ceramic materials for the nozzle design.
Distribution: Approved for public release
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Last Update / Reviewed: May 1, 2006