MIL-STD-376A
3.18 Confinement frame. A steel frame or other structural support
surrounding a ceramic tile which serves to retain it in place after it is
damaged by impact of a projectile.
3.19 Depth of residual penetration (DOP). In the context of this test
standard, the length or depth of the penetration cavity of the projectile in
the steel backing plate after passing through the ceramic.
3.20 Fair test. In the context of this standard, a test shot should be
considered fair when a test projectile having total yaw under 3 degrees
strikes the target within a radius equal to two penetrator diameters of the
exact tile center.
3.21 Integral armor. Armor material used as part of a structure to
perform a load-carrying or other operational function, in addition to
ballistic protection. Also known as structural armor.
3.22 Long rod penetrator. Any projectile having a length to diameter
(aspect) ratio greater than five.
3.23 Lumiline screens. Photoelectric device used to activate or
deactivate a chronograph upon passage of a projectile.
3.24 Muzzle velocity. The velocity of the projectile with respect to the
muzzle at the instant the projectile leaves the weapon. This velocity is a
function of projectile weight, firing charge of the projectile, and barrel
characteristics.
3.25 Obliquity. A measure, normally in degrees, of the extent to which the
impact of a projectile on an armor material deviates from a line normal to the
target. Thus, a projectile fired perpendicular to the armor surface has 0
degrees obliquity.
3.26
Obturator.
A component of the sabot package which serves as a bore
seal.
3.27 Overmatching. As used herein, a condition in which the penetration
capability of the projectile is much greater than the stopping capability of
the armor or armor material. Also used in association with steel armor, where
it indicates that the diameter of the impacting projectile is larger than the
thickness of the armor plate.
3.28 Penetration, complete (CP). A complete penetration occurs when a
projectile or fragment has penetrated the armor sufficiently to permit the
passage of light through a hole or crack developed in the armor, or when the
projectile lodged in the armor can be seen from the rear of the armor sample.
3.29 Penetration, reference (PO). The depth to which the standard test
projectile penetrates when fired at the standard striking velocity into a
semi-infinite RHA steel block.
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