Influence of Different Numbers of Rounds under Continuous Firing on Gun Barrel Life

doi:10.12382/bgxb.2021.0852

Abstract

Abstract:

The artillery is used with different charges of different types of ammunition (strong charge, full charge, reduced charge, high temperature charge, etc.), and have to undergo rapid continuous firing and performance test firing. It is necessary to study the impact of different charges of different types of ammunition and the number of rounds under rapid continuous firing on the barrel life. At present, for the assessment of barrel life, the method used is mainly to convert the number of projectiles of different types of ammunition into that of standard ammunition or standard ammunition with a specified ratio through the equivalent conversion factor in the national military standard. The existing national military standard equivalent conversion method for barrel life only includes two factors, chamber pressure and muzzle velocity, and does not consider the impact of rate of fire and number of rounds on barrel life, which makes it impossible to effectively evaluate barrel life under different numbers of rounds under continuous firing. The thermochemical ablation model of barrel material is established based on the Arrhenius equation. The influence of different numbers of rounds under continuous firing on the barrel life is studied. The larger the number of rounds under continuous firing, the shorter the barrel life. The accuracy of the thermochemical ablation model is verified by comparing the simulation and test results.

Key words: gun, barrel life, number of rounds under continuous firing, bore temperature

XU Yaofeng, WANG Jun, LIU Pengke, ZHU Wenfang, YANG Diao. Influence of Different Numbers of Rounds under Continuous Firing on Gun Barrel Life[J]. Acta Armamentarii, 2023, 44(4): 1034-1040.

Figures/Tables 7

Fig.1 Calculated curve of barrel life of a Swiss gun

Table 1 Comparison between test results and calculated results

射击发数	射速/ (发·min^-1)	初始温度/℃	测试时间/s	测试温度/℃	计算温度/℃
10	1000	23.8	2.4	26.4	26.3
11	1000	27.7	17.3	65.1	64.5
11	1000	30.4	23.8	70.0	67.0

Fig.2 Variation law of simulated temperature value of inner wall at 25.4mm forward of the starting point of barrel rifling with time under 1000 rounds/min and 33 consecutive rounds

Fig.3 Variation laws of initial temperature and maximum temperature of inner wall at 25.4mm forward of the starting point of barrel rifling

Table 2 EFC of different numbers of rounds under continuous firing with a single round as the standard projectile

持续射击发数	1	5	8	10	15	20	25	33
折算系数	1.00	1.39	1.58	1.69	1.91	2.10	2.26	2.48

Table 3 EFC of different numbers of rounds under continuous firing with 5 rounds as the standard projectile

持续射击发数	1	5	8	10	15	20	25	33
折算系数	0.72	1.00	1.13	1.23	1.38	1.51	1.62	1.78

Table 4 EFC of different numbers of rounds under continuous firing with 8 rounds as the standard projectile

持续射击发数	1	5	8	10	15	20	25	33
折算系数	0.63	0.88	1.00	1.07	1.21	1.33	1.43	1.56

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