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Acta Armamentarii ›› 2019, Vol. 40 ›› Issue (12): 2416-2424.doi: 10.3969/j.issn.1000-1093.2019.12.004

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Life Prediction of Gun Barrel Based on Shear Fatigue Damage of Coating Interface

GENG Xuehao1, ZHOU Kedong1, HE Lei1, FENG Guotong2, LI Junsong3   

  1. (1.School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China;2.Department of Precision Manufacturing Engineering, Suzhou Institute of Industrial Technology, Suzhou 215000, Jiangsu, China;3.No.208 Research Institute of China Ordnance Industries, Beijing 102202, China)
  • Received:2019-01-28 Revised:2019-01-28 Online:2020-02-14

Abstract: According to the theories of coating shear failure mechanism and cumulative fatigue damage of gun barrel, a gun barrel life prediction method based on the shear fatigue damage accumulation at the interface of coating and substrate in barrel is proposed to study the bore damage mechanism of gun barrel and improve the gun barrel life. A shear failure model of coating interface under the effect of thermo-pressure coupling stress is built, and the shear stress of coating interface during continuous firing of 150 rounds is calculated by taking a 5.8 mm caliber gun barrel as study object. The barrel life is predicted by use of temperature dependent tensile strength of gun barrel material. The predicted results match well with life test results, which verifies the feasibility and validity of the proposed life prediction model. The research results show that the prediction of gun barrel life based on the shear fatigue life of coating is feasible and the shear fatigue failure of coating interface is an important reason to lead to the life end of gun barrel. Key

Key words: automaticweapon, gunbarrellife, interfaceshear, thermo-pressurecoupling, fatiguedamage, lifeprediction

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