HYPERVELOCITY IMPACT CALCULATIONS AND THEIR CORRELATION WITH EXPERIMENT.
Interim rept. no. 2,
GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV
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Additional calculations are presented which confirm the previous conclusion that in a thick target the depth of penetration, of geometrically similar projectiles of like metal, varies with the impact velocity according to the impact velocity to the 23rds power in the hypervelocity regime. Calculations are also given which show that the crater dimensions are relatively insensitive to the density of homogeneous projectiles. Experimentally observed size effects are discussed in terms of the visco-plastic model and it is concluded that the threshold velocity for energy scaling will depend somewhat on the dimensions of the projectile. Finite plate calculations are also presented for several plate thicknesses. Moreover, the spatial divergence of the spallation bubble and the corresponding decrease in the momentum density is obtained as a function of the stand-off distance for two impact situations. Preliminary calculations are also included for impact into a target consisting of two spaced plates. Author