Accession Number : ADA299777
Title : Hydrocode Simulation of the Formation and Penetration of a Linear Shaped Demolition Charge Into an RHA Plate.
Descriptive Note : Final rept. Jan-Dec 94,
Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
Personal Author(s) : Gazonas, G. A. ; Segletes, S. B. ; Stegall, S. R. ; Paxton, C. V.
PDF Url : ADA299777
Report Date : JUL 1995
Pagination or Media Count : 97
Abstract : This report presents the results of a combined experimental and numerical investigation of the formation and penetration of a linear shaped demolition charge into a rolled homogeneous armor (RHA) plate. The demolition charge is composed of a mild steel liner, filed with castable Composition-B high explosive. The numerical computations were conducted before the experiments using the Lagrangian hydrocode EPIC92 and predict a jet tip free flight velocity of about 5.2 kmls at 12)IL. However, observed jet tip free flight velocities of the linear shaped charge (LSC) range from 33 to 35 km/s as determined from flash radiography, and 3.5 km/s using a special electrical makewire circuit test fixture. The reason for the large discrepancy between the predicted and observed jet tip free flight velocities appears to be related to inaccuracies resulting from the highly distorted computational mesh in the collapsing liner. Using the automatic rezone feature in the EPIC94 version of the hydrocode results in the reduction of the jet tip velocity from 4.7 km/s to 3.8 km/s at 4 ps. However, computations beyond 4 ps were not possible due to numerical instabilities associated with requiring a vanishingly small integration time increment resulting from an equation-of-state instability. Penetration depths into two rectangular r, 2-in-thick (50. 8mm) RHA plates measure 17 and 18 mm respectively, whereas the hydrocode simulation predictss greater penetration depth of 22.9 mm. The work attests to the importance of conducting experiments in order to verify baseline hydrocode stimulation.
Descriptors : *SHAPED CHARGES, *ARMOR PLATE, *DEMOLITION CHARGES, LINEAR SYSTEMS, SIMULATION, ARMOR, COMPUTATIONS, NUMERICAL ANALYSIS, DEPTH, STEEL, MESH, LININGS, PENETRATION, COLLAPSE, HOMOGENEITY, ROLLING(METALLURGY).
Subject Categories : Ammunition and Explosives
Distribution Statement : APPROVED FOR PUBLIC RELEASE