Abstract
This paper is devoted to research the interface failure mechanism of coating in gun barrel, three interface failure models (interface shear failure, interface bending failure and interface crack growth failure) of coating in gun barrel are built with consideration of thermal-pressure coupling effect, and the failure criterion is given. The critical failure length/thickness ratio of coating segments for different failure models during firing process are calculated based on temperature field simulation result, then by comparison of the calculation results, the main interface failure way of coating in gun barrel is confirmed.
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