MIL-STD-662F
Other methods attempt to approximate the V100 Point, that is, the minimum velocity at which all projectiles will completely penetrate.
3.8 Ballistic limit, protection criteria (V50BL(P)). The V50BL(P) may be defined as the average of an equal number of highest partial penetration velocities and the lowest complete penetration velocities which occur within a specified velocity spread. The normal up-and-down firing procedure is used. A 0.020 in. (0.51 mm) thick 2024 T3 sheet of aluminum is placed 6 + 1/2 in. (152 + 12.7 mm) behind and parallel to the target to witness complete penetrations. Normally, at least two partial and two complete penetration velocities are used to complete the BL(P). Four, six, and ten-round ballistic limits are frequently used. The maximum allowable velocity span is dependent on the armor material and test conditions. Maximum velocity spans of 60, 90, 100 and 125 feet per second (ft/s) (18, 27, 30 and 38 m/s) are frequently used.
3.9 Ballistic resistance. A measure of the capability of a material or component to stop or reduce the impact velocity and mass of an impacting projectile or fragment.
3.10 Ceramic composite armor. A type of composite armor which consists of a ceramic face bonded to a reinforced plastic laminate or metallic backplate.
3.11 Chronograph. An electronic instrument used to determine the time interval of projectile flight between two fixed measuring stations.
3.12 Composite armor. An armor system consisting of two or more different armor materials bonded together to form a protective unit.
3.13 Fair hits (for ceramic composite armor). The definitions contained herein apply to the ballistic testing of ceramic composite armor which consists (in part) of ceramic tiles.
a. Fair hit (center tile) - A fair hit for the center tile of the ceramic composite armor is an area within one inch (25.4 mm) radius of the center of an undamaged tile.
b. Fair hit (adjacent tile) - A fair hit in an adjacent tile is a fair hit (center tile) in a tile that has an edge adjacent to a previously impacted tile whose hit was declared a fair hit.
c. Fair hit (joint line) - A fair hit on a joint line is a hit within 0.15 in. (3.8 mm) of a single joint between two tiles, but no closer than 0.5 in. (12.7 mm) from the intersection of three or more tiles.
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