✍ Scribed by R.R. Franzen; J.D. Walker; D.L. Orphal; C.E. Anderson Jr
No coin nor oath required. For personal study only.
This study investigates the question of whether the penetration performance of a segmented rod penetrator with segment-L/D ~< 1 can exceed that of a uniform density continuous rod of equal mass, length (including spaces), diameter and velocity ("comparison rod"). The answer, based on experimental, computational and analytical data published to-date, is negative. The well-known fact that segmented rods penetrate better than their so-called "parent rods" (rods of equal mass, diameter and velocity and a length equal to the sum of segment lengths only), together with findings presented here, limits the penetration performance of segmented rods to Pparent rod ~ Pscgmented rod < Pcomparison rod"
The limitations of the data base used here may limit the generality of the findings: in particular, the database is fairly small, only unyawed, normal impacts at velocities of 2 km/s and higher are included, and, with few exceptions, only tungsten segments and steel targets were studied.
h p/otL L segment length L/D p penetration Pcomp.rod comparison rod penetration Prod rod penetration P~gm segment penetration r Pscgm/Pcomp.rod pp penetrator density p, target density [9 pp" L/(L+ s) s segment spacing u penetration velocity UHug Hugoniot particle velocity ~2 average penetration velocity v impact velocity NOTATION
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