Numeric Analysis of Barrel Heat-pressure Joint Effect Based on Follow-up Boundary

YU Qingbo;YANG Guolai;GE Jianli

Acta Armamentarii ›› 2019, Vol. 40 ›› Issue (4) : 697-707. DOI: 10.3969/j.issn.1000-1093.2019.04.004
Paper

Numeric Analysis of Barrel Heat-pressure Joint Effect Based on Follow-up Boundary

  • YU Qingbo,YANG Guolai,GE Jianli
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Abstract

In order to explore the transient impact effect of high-temperature and high-pressure propellant gas on the response to barrel strength, the finite element method is utilized to establish a three-dimensional numericalmodel for a large-caliber gun barrel. The variation of loading boundary of propellant gas with the projectile motion is defined. The evolution process of non-uniform distribution of temperature field in barrel at different moments under the first firing condition was obtained through numeric computation. The influences of thermal load, pressure and the heat-pressure joint effect on the dynamic stress response of barrel are further investigated, respectively. The calculated results show that the difference of thermal shock loads at different axial positions leads to an axial non-uniform temperature distribution, which makes the axial temperature gradient large and causes a significant axial thermal stress. In the area with intense temperature response, the compressive stress induced by thermal load and the tensile stress induced by pressure incircumferential direction make the stress componentact as the interaction between the tensile stress and the compressive stress. Compared with the gas pressure effect, the stress amplitude in the high stress region on the inner wall is weakened, and presents a trend of falling first and then rising with the temperature. Key

Key words

gunbarrel / follow-upboundary / heat-pressurejointeffect / transientimpact / numericanalysis / subroutine

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YU Qingbo,YANG Guolai,GE Jianli. Numeric Analysis of Barrel Heat-pressure Joint Effect Based on Follow-up Boundary. Acta Armamentarii. 2019, 40(4): 697-707 https://doi.org/10.3969/j.issn.1000-1093.2019.04.004

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第40卷
第4期2019年4月兵工学报ACTA
ARMAMENTARIIVol.40No.4Apr.2019

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