Abstract
The primary concern for the design and test of the ceramic gun nozzle is the combination of the thermal stress and ballistic dynamic stress. On the thermal analysis basis, a transient sequentially coupled finite element model (FEM) is performed to investigate the thermal stresses due to 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 for interior ballistic analysis for the ceramic nozzle. Three candidate ceramic materials, SN47, STK4, and ZRO2, are investigated and compared with the 4340 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 gun nozzle design.
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