Research And Numerical Simulation On Acceleration Course Of Flyer Plate Driven By Plate Charge

The conception and research status of explosive reactive armor are introduced, and the background to this topic and purpose of this research are described. The movement of flyer plate driven by explosives is analyzed by theoretic models, numerical simulations and experiments. The main content in this research includes as:(1)According to status parameters of the flow-field of detonation products, the mathematical model of flyer plate'acceleration process and deflection angle model are established. The velocity, deformation angle and position of flyer plate at different times are derived.(2)The physical image of flyer deformation and variations of parameters are calculated by numerical simulation. Variations of flyer plate'velocity, acceleration, deflection angle and displacement with time are analyzed by using the multi-material arbitrary Lagrange - Euler methods in three-dimension FEM analysis Program LS-DYNA3D. Then the effect of thicknesses of metal plate and charge on the flyer movement is studied.(3)The movement of flyer plate is tested by experiments, and the theoretical model and numerical simulation results are verified.Results show that: Under the same thickness of charge, the limit velocity and deflection angle of front plate increase with the mass ratio of back plate to front plate, when the thickness of front plate is unchanged. But when the mass ratio increases to some extent, the velocity and deflection angle keep unchanged. With the same thickness of flyer plate, the limit velocity and deflection angle of front flyer increase with the increasing the charge thickness. Therefore front plate'speed and deflection angle can appropriately improved by increasing thickness of back plate'or the charge. Thus the study provides a theoretical basis for the design of the new ERA, and gives a reference for the study of interaction course between ERA and shaped charge jet.