圆柱形预制破片爆炸驱动仿真研究

Numerical Simulation of Cylindrical Prefabricated Fragment Under Explosive-driven Process

为获得更精确的预制破片初速计算模型及破片变形与内衬层破裂半径对初速的影响规律,进行一种圆柱形预制破片爆炸驱动仿真研究。通过分析预制破片战斗部的爆炸驱动过程,建立考虑内衬层破裂半径及破片变形量的预制破片理论初速计算模型,利用非线性动力学分析软件AUTODYN,采用Johnson-Cook本构模型和流固耦合算法,对圆柱形预制破片的爆炸驱动进行了仿真研究。仿真结果表明:随着内衬层厚度的增加,内衬层破裂半径增大,圆柱形预制破片的变形量减少。钢制破片及修正后的钨合金破片的理论初速与仿真结果吻合较好,验证了计算模型的正确性。该研究结果对预制破片战斗部的设计具有一定的参考意义。

Numerical simulation of the cylindrical prefabricated fragment under explosive-driven process has been done in order to obtain more accurate prefabricated fragment calculation model and the effect of fragment deformation and fracture radius of liner on initial velocity. The calculation model on initial velocity of prefabricated fragment which considered fracture radius of liner and deformation of fragments has been established by analysis the explosive-driven process of warhead. The explosive-driven process of cylindrical prefabricated fragment has been studied by using nonlinear dynamics analysis software AUTODYN, Johnson-Cook constitutive model of dynamic and fluid-structure interaction method. The simulation results show that fracture radius increases and deformation of cylindrical prefabricated fragment reduce as the increase of thickness of liner. The calculated initial velocity of steel fragments and tungsten alloy fragments after amendment has been verified by the simulation. Result of this study has some reference for prefabricated fragment warhead design.