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Perforation Limits for Nonshattering Projectile against Thick Homogeneous Armor at Normal Incidence

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Rept. for Mar 1943-Sep 1945

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Using unjacketed caliber .244 projectiles that did not shatter, limit energies have ben determined at normal incidence for homogeneous armor BHN 255 ranging in thickness from 0.24 to 6 calibers. For plates over 1.5 calibers thick, the data have been correlated by means of an empirical equation of the form WV expn 2 d expn 3 R e d expn n, where W is the weight of the projectile, V is limit velocity R is a measure of the strength of the plate material and has units of force per unit area, e is the plate thickness, d is the diameter of the projectile, and n is a constant. With a particular ptojectile and plate of a given thickness, R and n are constant, but they vary with changes in the plate and projectile parameters. 1 R and n are independent of the mass of the projectile only for thick plate 1.5 calibers. For thinner plate the limit energy was found to increase with increase in mass. 2 For projectiles of conventional nose shape n has a nominal value near 1.25 less than the value usually used in De Marre formula. Changes in shape produce slight variations in both R and n. As the nose becomes sharper R and n decrease. 3 There is an indication that a scale effect causes a small decrease in R with an increase in the caliber of the projectile. 4 As expected, R incrased with an incrase in plate hardness.

Subject Categories:

  • Ammunition and Explosives
  • Ballistics

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