
Accession Number : ADA953510
Title : Perforation Limits for Nonshattering Projectile against Thick Homogeneous Armor at Normal Incidence
Descriptive Note : Rept. for Mar 1943Sep 1945
Corporate Author : PRINCETON UNIV NJ
Personal Author(s) : Curtis, C W ; Kramer, R L
PDF Url : ADA953510
Report Date : Dec 1945
Pagination or Media Count : 19
Abstract : 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.
Descriptors : *ARMOR PIERCING AMMUNITION, *ARMOR PLATE, HARDNESS, HOMOGENEITY, LIMITATIONS, MATHEMATICAL MODELS, PERFORATION, TERMINAL BALLISTICS, THICKNESS
Subject Categories : Ammunition and Explosives
Ballistics
Distribution Statement : APPROVED FOR PUBLIC RELEASE