CALCULATION C SHAPED-CHARGE JETS USING ENGINEERING APPROXIMATIONS AND FINITE DIFFERENCE COMPUTER CODES VOLUME ⅡMODIFICATION AND UTILIZATION OF A TWO-DIMENSIONAL FINITE DIFFERENCE CONTINUUM MECHANICS CODE TO CALCULATE THE JET FORMATION PARAMETERS FOR ANY GENERALIZED AXISYMMETRIC SHAPED CHARGE

摘要

This report describes a technique to optimize the current shaped-charge design procedure as follows. Starting with the desired target to be defeated, a determination of the desired penetration characteristics of the jet would be made. Existing jet penetration theory would then be used to estimate the ideal characteristics of the jet to defeat the given target. Volume II describes the modification and utilization of a two-dimensional finite difference continuum mechanics code utilizing the lagrangian coordinate system to calculate the complete jet formation parameters for any generalized axisymmetric shaped charge. The utilization of this code allows a more detailed study of such phenomena as jet stability, bifurcation on the axis, shear gradients, viscosity, shocks, incipient vaporization, surface tension, and possible other effects. The combined use of both the engineering formulations along with the sophisticated two-dimensional code calculation allows design engineers the versatility to design the most optimum shaped charge for their particular application.