Numerical modelling and the physical pattern of deformation and destruction of metallic jets produced by shaped charges

The results of experimental and theoretical (numerical) investigation into stretching and rupture of metallic jets produced by a shaped charge are pre sented. The quantitative characteristics of the process are the inertial- a nd ultimate-elongation ratios, the number of separated individual elements, and the related relative initial length of a jet portion forming an indivi dual gradientless element after the rupture. Experimental data on rupture o f jets formed from various material are presented, and expressions approxim ating dependences of the ultimate-elongation ratio on the initial axial-vel ocity gradient and radius of jet elements. Changes in the kinematic and dyn amic parameters and energy balance in the stretched element are ascertained theoretically. A radial oscillatory process in a stretched jet is revealed and explored. The calculated dependences of the quantitative characteristi cs of stretching and rupture of plastically destroyed jets produced by shap ed charges on the jet parameters and characteristics of the material provid e a dose fit to the available experimental data. The possibility of control ling the jet behaviour by external electromagnetic impacts is demonstrated using a few particular examples.