THEORETICAL ASPECTS AND NUMERICAL SIMULATION OF CUMULATIVE EFFECT

Marinko Ugrčić,

Milorad Blagojević,

Zoran Bajić

Abstract: This paper gives the results of theoretical and experimental studies of cumulative effects (Munroe’s effect). The functioning of a number of different types of high explosive antitank projectiles and missile warheads designed for fighting armored vehicles is based on the principles of this effect.

A brief history of the development of shaped charge along with a description of all phases of its operation is given. The regularity of the formation and stability of the shaped charge jet, as essential prerequisites for achieving the proper functioning and required efficiency of the shaped charge are considered. Special attention is given to secondary effects of this process that includes the effects of jet fragmentation and effects behind the perforated obstacle.

The classification and detailed analysis of many significant factors on which the functioning and performances of charge depend were carried out. For this analysis, a program based on the hydrodynamic theory of jet formation and jet penetration was used.

The results of numerical simulations of the cumulative effect by the finite element method using ANSYS AUTODYN solver are presented. In this case, the analysis was performed using the finite element method, where the functioning of the shaped charge, for the appropriate initial and boundary conditions, was described by partial differential equations of the flow of materials, stress-strain state in the material, the material state equations and equations of shock wave. Furthermore, the results of experimental researching of shaped charge functioning were shown.

Keywords: cumulative projectille, shaped charge, cumulative effect, shaped charge warheads, hollow charge jet, jet formation, numerical simulation.