Justification of Design and Efficacy of Explosive Devices with Combined Cumulative Casing

摘要

Objectives: Develop and suggest designs for cumulative charges with figurine-shaped cumulative casing. Do fundamental and experimental research to evaluate action efficacy for the developed cumulative charges. Methods/Analysis: To describe the findings from the theoretical research on a design behaviour of cumulative charges with the figurine-shaped cumulative casing, we used, respectively, the Johns-Wilkins-Lee equation of state and the perfect gas law. To describe the behaviour of the materials in the cumulative casing, the housing and the target, we applied the Johnson-Cook model and the Gruneisen equation of state. The task was solved in a three-dimensional setting, taking into account design symmetry about planes, i.e. we estimated 1/4 of the model. Results: The processed theoretical and experimental data show that with the decreased opening angle of the conical surface in the combined casing, the barrier penetration depth increases. The angle on the cumulative charge conical surface equal to 47° is the best to ensure the maximum depth of penetration made with axisymmetric cumulative charges. The application of charges with the proposed design allows increasing the penetration diameter by 1.34 to 1.67 times, as compared to the standard design charges. At the same time, the inlet surface of the formed tunnel increases by 1.7 to 2.8 times. Novelty/Improvements: The design has been proposed for the charge with the figurine-shaped cumulative casing with various opening angles of cumulative casings and with the fixed amount of charge gouges. The charge design consists of the conical and spherical or elliptical cumulative surfaces conjugated with each other. At the same time, the conical cumulative surface is a top of the cumulative casing, while the spherical or elliptical cumulative surface has longitudinal gouges.