Further investigation of the target resistance penetration parameter R[sub t]

Partom, Y.; Anderson, C. E.; Orphal, D. L.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p1129
Academic Journal
The quasi steady-state penetration of long rods into semi-infinite targets has been described by the modified Bernoulli equation (MBE) 1/2ρ[SUBp] (V-U)[SUP2] + Y[SUBp]=1/2ρ[SUBt] U[SUP2] + R[SUBt], where R[SUBt] is a material dependent parameter corresponding to target resistance to penetration. Rosenberg and Dekel (1994) investigated the dependence of R[SUBt] on target strength Y[SUBt] and impact velocity V. They found an R[SUBt] (Y[SUBt]) dependence similar to the one obtained from cavity expansion analysis, and a decreasing R[SUBt](V) dependence. Following Rosenberg and Dekel, we use AUTODYN2D/EULER to investigate further the parameter R[SUBt]. We use a strengthless projectile (Y[SUBp]=0), monitor the penetration velocity, and evaluate R[SUBt] from the MBE. We find that: 1) R[SUBt] goes to zero for Y[SUBt]=0; 2) R[SUBt] increases with Y[SUBt] by a somewhat weaker than linear relation; 3) R[SUBt] increases with V at high impact velocity; and 4) for low values of q = 1/2ρ[SUBp] V[SUP2]/Y[SUBt] , the turned projectile material interacts with the incoming projectile, and steady state is never reached, thus R[SUBt] is not defined.


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