MIL-STD-662F
3.2 Areal density. A measure of the weight of armor material per unit area, usually expressed in pounds per square foot (1b/ft2) or kilograms per square meter (kg/m2) of surface area.
3.3 Armor. A shielding material provided for ballistic defeat of projectiles or fragments when inherent shielding is inadequate.
3.4 Ballistic acceptance test. A test performed on lot representative samples to determine whether or not the lot of armor is ballistically acceptable for use in production armor items.
3.5 Ballistic coefficient. A parameter or measure which is used to represent or account for the attenuation of the velocity of a projectile or fragment in transit from the firing mechanism to the target. "Ballistic coefficients" are normally used in approximate formulations to determine average speed or times-of-flight for a projectile. For example, average projectile speed, Vp, can be obtained from:
Vp = Vo R
exp ( R)-1
where
Vo = muzzle velocity
R = range
= ballistic coefficient
3.6 Ballistic impact. Those impacts due to hits on the target by projectiles, fragments or other aerodynamically-affected threat mechanisms.
3.7 Ballistic limit. The minimum velocity at which a particular projectile is expected to consistently, completely penetrate armor of given thickness and physical properties at a specified angle of obliquity. The ballistic limit may also be defined as the maximum velocity at which a particular projectile is expected to consistently fail to penetrate armor of given thickness and physical properties at a specified angle of obliquity. Because of the expense of firing tests and the impossibility of controlling striking velocity precisely, plus the existence of a zone of mixed results in which a projectile may completely penetrate or only partially penetrate under apparently identical conditions, statistical approaches are necessary, based upon limited firings. Certain approaches lead to approximation of the V50 Point, that is, the velocity at which complete penetration and incomplete penetration are equally likely to occur. Other methods attempt to approximate the VO Point, that is, the maximum velocity at which no complete penetration will occur.
3
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business