爆炸冲击作用下金属圆柱壳体膨胀破碎过程研究
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摘要
为了研究爆轰冲击作用下金属圆柱壳体动态膨胀及变形断裂过程,以40Cr Mn Si B钢壳体材料为研究对象,在理论分析的基础上建立了炸药与壳体相互作用过程分析模型,获得了爆轰作用过程中金属壳体外表面径向位移以及速度变化规律;应用超高速摄影技术获得了壳体在高应变率下动态变形过程。结果表明:膨胀半径达到初始外半径的1.47~1.70倍时,壳体内部裂纹贯穿整个壁厚并发生断裂;壳体膨胀速度在距起爆端60%~70%壳体轴向长度处达到最大,此处膨胀速度比起爆端附近提高了18.3%。
To study the dynamic expansion,deformation and fracture process of cylindrical metal shell under explosion shock,the cylinder shells fabricated from 40 Cr Mn Si B steel was selected as the study object. The model of interaction between the explosive and the shell was established,and the variation of radial displacement and velocities of outer-wall from the shell was obtained. The ultra-high speed photographic technology was applied to study the dynamic deformation process of shell at high strain-rates. The result shows that,the shell is in the fracture phase wherein cracks penetrate the entire casing wall while the expansion radius is within the range 1. 47 ~ 1. 70 times of the initial outer radius. The expansion velocity of shell away from initiation point about 60% ~ 70% shell axial-length reaches the maximum wherein the velocity increases by 18.3% compared to expansion velocity of the initiation end.
To study the dynamic expansion,deformation and fracture process of cylindrical metal shell under explosion shock,the cylinder shells fabricated from 40 Cr Mn Si B steel was selected as the study object. The model of interaction between the explosive and the shell was established,and the variation of radial displacement and velocities of outer-wall from the shell was obtained. The ultra-high speed photographic technology was applied to study the dynamic deformation process of shell at high strain-rates. The result shows that,the shell is in the fracture phase wherein cracks penetrate the entire casing wall while the expansion radius is within the range 1. 47 ~ 1. 70 times of the initial outer radius. The expansion velocity of shell away from initiation point about 60% ~ 70% shell axial-length reaches the maximum wherein the velocity increases by 18.3% compared to expansion velocity of the initiation end.
引文
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[2]HOGGATT R H,RECHT R F.Fracture behavior of tubular bombs[J].Journal of Applied Physics,1968,39(3):1856-1862.
[3]孙承纬.爆炸物理学[M].北京:科学出版社,2011:822-825.SUN Chengwei.Explosion physics[M].Beijing:Science Press,2011:822-825.(in Chinese)
[4]CHOU P C,CARLEONE J,FLIS W J,et al.Improved formulas for velocity,acceleration,and projection angle of explosively driven liners[J].Propellants,Explosives,Pyrotechnics,1983,8(6):175-183.
[5]HIROE T,FUJIWARA K,HATA H,et al.Deformation and fragmentation behavior of exploded metal cylinders and the effects of wall materials,configuration,explosive energy and initiated locations[J].International Journal of Impact Engineering,2008,35(12):1578-1586.
[6]ZHANG H,RAVI C K.On the dynamics of localization and fragmentation-Ⅳ,expansion of Al 6061-O tubes[J].International Journal of Fracture,2010,163(1):41-65.
[7]任国武,郭召亮.高应变率加载下金属柱壳断裂的实验研究[J].兵工学报,2016,37(1):77-82.REN Guowu,GUO Zhaoliang.Experimental research on fracture of metal case under loading at high strain rate[J].Acta Armamentarii,2016,37(1):77-82.(in Chinese)
[8]FLIS W J.A Lagrangian approach to modeling the acceleration of metal by explosives[J].Developments in Theoretical and Applied Mechanics,1994,17:190-203.
[9]GURNEY R W.The initial velocities of fragments from bombs,shells and grenades:BRL 405[R].Aberdeen,Maryland:US Army Ballistic Research Lab,1943.
[10]南宇翔,蒋建伟.一种CL-20基压装混合炸药JWL状态方程参数研究[J].含能材料,2015,23(6):516-521.NAN Yuxiang,JIANG Jianwei.JWL equation of state of detonation product for CL-20 baesd pressed composite explosive[J].Chinese Journal of Energetic Materials,2015,23(6):516-521.(in Chinese)