Thermo-mechanical coupling numerical analysis of cannon barrels with different thicknesses of Ta10W coating
It is one of the important means to prolong the barrel weapon life by using double glow plasma surface alloying technique to permeate anti-ablation coating.To investigate the influence of Ta10W coating on the heat transfer process and stress distribution of a cannon during the firing,and to reveal the impact of different coating thicknesses on the cannon barrel,this article established a three-dimensional numerical model of a 125 mm caliber cannon using the finite element method.Based on the thermo-mechanical coupling finite element model of the barrel,the thermal load and boundaries were defined according to the dynamic changes of high-temperature and high-pressure combustion gas during the interior ballistics phase.The heat transfer model and stress field distribution model of 0.04～0.10 mm Ta10W thickness under high-speed thermal flow conditions were obtained.The computational simulation results show that with the increasing coating thickness,the highest temperature at the rear of the gun after firing shows a decreasing trend.The difference in stress generated by different thicknesses is greater in the middle section of the barrel than at the rear of the barrel.Additionally,stress concentration occurs at the interface between the coating and the substrate at the breech.The maximum stress values of the 0.04 mm,0.07 mm,and 0.10 mm thickness coatings are 891.4 MPa,884.3 MPa,and 879.1 MPa,respectively.
cannon barrelTa10W coatingthermo-mechanical couplingtemperature fieldstress field
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