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.
引文
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