1、 INCH-POUNDMIL -STD -662F18 December 1997SUPERSEDINGMIL -STD -662E22 January 1987DEPARTMENT OF DEFENSETEST METHOD STANDARDV 50 BALLISTIC TEST FOR ARMORAMSC N/A FSC 8470Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-662FiiFOREWORD1. This stan
2、dard is approved for use by all Departments and Agencies ofthe Department of Defense (DoD).2. Beneficial comments (recommendations, additions, deletions) and anypertinent data which may be of use in improving this document should beaddressed to: Director, U.S. Army Research Laboratory, Weapons thus,
3、 giving greater accuracy in actual average velocity.4.3.3 Radar . Doppler radar is used occasionally to check lumiline screens.4.4 Propellant . Any propellant which is either standard or suitable for the weaponshall be used. A projectile velocity -propellant charge curve for the weapon shall bedeter
4、mined before any testing is performed. This curve is required to provide a basis forselecting a powder charge to achieve a desired velocity. It is recommended that thepropellant storage and weighing area be maintained at 19 -24 o C (65 -75 o F) and 50 + 5%relative humidity.4.5 Test sample mount . Th
5、e armor test sample shall be secured on the test targetmount with impact side perpendicular to the line -of -flight of the projectile. The framesupports and clamps or mounting fixtures must be capable of retaining the sample andwithstanding shock resulting from ballistic impact by the test projectil
6、es. The test samplemount shall be capable of adjustment for moving the sample in the vertical or horizontaldirections so that the point of impact can be located anywhere on the sample, and so thatzero degree obliquity impacts can be achieved anywhere on the sample. The testsample mount shall be able
7、 to rotate on the vertical or horizontal axis so that variousobliquity attack angles can be achieved. The test samples shall be mounted with arigidity equal to or greater than the actual installation of the part.4.6 Test sample . The sampling plan for ballistic acceptance tests shall be specifiedin
8、the contract.5. DETAILED REQUIREMENTS5.1 Test conditions . Unless otherwise specified, all ballistic tests shall be performedin a standard atmosphere of 23 + 2 o C (73 + 4 o F) and 50 + 5% relative humidity. Temperature and humidity measurements shall be recorded for each firing.5.2 Equipment setup
9、.5.2.1 Triggering devices . The spacing from the weapon muzzle to the first pair oftriggering devices shall be sufficient to prevent damage from muzzle blast andobscuration from smoke in case optical devices are used. Recommended distances canProvided by IHSNot for ResaleNo reproduction or networkin
10、g permitted without license from IHS-,-,-MIL-STD-662F9be found in ITOP 4 -2 -805. Spacing between triggering devices is a function of theexpected velocity of the projectile being fired. In many instances, physical restriction,such as short overall distance from muzzle to test sample, dictates the sp
11、acing of thetriggering devices. The last pair of triggering devices shall be placed at least 4 ft (122cm) in front of test sample and should be protected from possible damage resulting fromfragments.5.2.2 Witness plate . The witness plate shall be 0.002 in. (0.05 mm) thick aluminumsheet for transpar
12、ent armors and vision devices and 0.020 in. (0.51 mm) thick aluminumsheet for all other armors. The minimum size of the witness plate shall be 11 in. by l4 in.(279 mm X 356 mm) and be of sufficient size to be impacted by all fragments resultingfrom projectile penetration. The witness plate shall be
13、made of 2024 -T3, 2024 -T4 or5052 aluminum alloy sheet, and shall be located 6 + 0.5 in. (150 + 10 mm) behind andparallel to the armor test sample. When the test sample is a helmet the witness plateshall be rigidly mounted inside the helmet and 2 in. (51 mm) behind the area of impactand may be small
14、er than specified above so that it will fit inside the helmet. When thetarget presents a curved surface, such as a visor, the witness plate shall be located 6 +0.5 in. (150 + 10 mm) behind the target, curved and oriented to maximize the probabilityof perpendicular impact.5.3 Ballistic test procedure
15、 . The procedure listed below is a general description ofthe method for obtaining a V 50 BL(P). One should note that the actual method to be usedmay vary depending on target composition, specification or contract requirement.5.3.1 Warm -up for constant velocity . When warmer rounds are needed for we
16、aponor target alignment or establishment of a specific striking velocity, a test round shall befired through the witness plate to determine the exact point of impact. Additional roundsshall be fired as required until the proper alignment and a stable striking velocity havebeen achieved. The propella
17、nt charge versus velocity curve for the weapon being usedshall be referred to as a guide for establishing the required velocity within a practical +tolerance. Normally, this will be about + 25 ft/s (8 m/s).5.3.2 Yaw . The test sample shall be mounted as described in 4.5. The point ofimpact shall be
18、located on the test sample and shall be positioned to line up with thepreviously determined line of flight of the projectile. Yaw shall be measured for eachround by yaw cards, flash radiograph or photography. Any round for which yaw isdetermined to be greater than 5 o shall be disregarded in the cal
19、culation of the ballisticlimit. In the case of a dispute concerning a particular barrel, yaw shall be measured by aphotographic measurement system using a multi -flash light source to determine projectilevelocity and yaw. Yaw shall be measured by the system to an accuracy of 0.5 degree.Provided by I
20、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-662F105.3.3 First firing . For acceptance testing, the first round shall be loaded with areference propellant charge so that the striking velocity is approximately 75 to l00 ft/s (23to 30 m/s) above the mini
21、mum required V 50BL(P) as given by the appropriatespecification. For most other types of ballistic tests, the first round shall be loaded with areference propellant charge where the estimated likelihood of either complete or partialpenetration is 50%.5.3.4 Examination of witness plate . The witness
22、plate shall be examined forpenetration by holding it up to a light to observe light passage. A complete penetration isrecorded when any light passes through the witness plate. If no light is visible throughthe witness plate, a partial penetration is recorded.5.3.5 Subsequent firings . If the first r
23、ound fired yields a complete penetration, thepropellant charge for the second round shall be equal to that of the first round minus apropellant decrement for a 50 or 100 ft/s (15 or 30 m/s) velocity decrease in order toobtain a partial penetration. If the first round fired yields a partial penetrati
24、on, thepropellant charge for the second round shall be equal to that of the first round plus apropellant increment for a 50 ft/s (15 m/s) velocity increase in order to obtain a completepenetration. A propellant increment or decrement, as applicable, for at least 50 ft/s (15m/s) shall be used until o
25、ne partial and one complete penetration is obtained. Afterobtaining a partial and a complete penetration, the propellant increment or decrement for50 ft/s (15 m/s) shall be used. Firing shall be continued until a V 50 BL(P) is determined,using a random pattern of impact sites, unless otherwise speci
26、fied.5.4 Calculation of the V50 BL(P) ballistic limit . The V 50 BL(P) shall be calculated bytaking the arithmetic mean of an equal number of the highest partial and the lowestcomplete penetration impact velocities within the allowable velocity span as defined bythe contracting officer (see USATECOM
27、 TOP 2 -2 -7l0).5.5 Computation of striking velocity . Instrumentation velocities shall be corrected asfollows:V S = V I - V LWhere:V S = Striking velocity at the test sampleV I = Instrumentation velocity= Distance (between sensory devices )Time (chronograph reading)Provided by IHSNot for ResaleNo r
28、eproduction or networking permitted without license from IHS-,-,-MIL-STD-662F11V L = Velocity loss (over target base line)Velocity loss is calculated in accordance with the following formula:V L = (XG D rel)/CWhere:X = Distance from baseline to targetG = Drag factor (can be obtained from APG per ITO
29、P 4 -2 -805, Appendix F).D rel = Relative air densityC = Ballistic coefficient( per ITOP 4 -2 -805, Appendix F).5.6 Ballistic test report . Ballistic test reports shall contain the following minimuminformation as applicable:a. Contractor identification.b. Test facility.c. Contract number.d. Lot numb
30、ers and quantities.e. Item specification number.f. Armor material description.g. Material identification number for each test sample.h. Temperature and humidity at the test facility.i. Date.j. Personnel conducting test and any witnesses.k. Weapon used.l. Projectile used.m. Projectile weight, grains.
31、n. Type of propellant.o. Weight of propellant for each shot, grains.p. Impact velocities used in computing V 50 s with highest partial penetration,lowest complete penetration, range (spread), and velocities of all rounds.q. Witness plate characteristics, partial or complete.r. Calculated V 50 BL(P)
32、ballistic limit.s. Remarks pertinent to the conduct of the test, or behavior of the material.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-662F12Additional data may be required by a contracting activity. When testing is done at aplace other
33、 than a Government facility, results shall be reported on forms either furnishedor approved by the Government. One copy of each complete report shall be forwarded tothe agency designated by the Government.5.7 Acceptance and rejection . The selected armor samples shall meet the minimumV 50BL(P) balli
34、stic requirements specified in the order for the represented lot to beacceptable. Failure of any test samples to meet the minimum specified V 50 BL(P) ballisticlimit shall constitute rejection of the entire lot which they represent. Unless otherwisespecified, the ballistic tests shall be conducted a
35、nd the test results accepted prior toshipment of the lot of armor represented by the test samples.5.8 Test samples ownership . Ballistic test samples that comply with ballisticrequirements are considered as part of the lot of armor they represent, and ownership ofthem passes to the Government upon a
36、cceptance. The Government inspector shalldispose of these test samples unless instructed otherwise by the procuring activity. Testsamples that fail to comply with the ballistic requirements are considered as part of the lotthey represent and remain the property of the supplier just as does the rejec
37、ted lot theyrepresent.5.9 Retests . Reference shall be made to the appropriate specification or applicabletest directive for guidance on the number of retest samples required, if such are allowed. If the retest samples do not pass the ballistic test, the lot from which they came, or theprocess by wh
38、ich they were made shall be permanently rejected. Otherwise, if all retestsamples pass, the lot or process shall be accepted.5.10 Security classification of armor . Terminal ballistics performance data on armormaterials shall be classified in accordance with ARL PROGRAM No. 0183009, “SecurityClassif
39、ication Guide for Armor Materials“ dated 30 July 1993.6. NOTES(This section contains information of a general or explanatory nature that may be helpful,but is not mandatory.)6.1 Intended use . This test method standard is military unique because it isintended for use in ballistic acceptance testing
40、of armor and for research anddevelopment of new armor materials (see 1.2).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-662F136.2 Subject term (key word) listing .ProjectilePropellantWeapons6.3 Changes from previous issue . Marginal notatio
41、ns are not used in this revisionto identify changes with respect to the previous issue due to the extent of the changes.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-662F14TABLE I. Projectile velocities (feet/second) .REMAINING VELOCITY (F/
42、S) AT SPECIFIC DISTANCETARGETDISTANCE5.56mmM1937.62mm BallM80, M597.62mm API BZ M43SOVIET, Short7.62mm Ball X54RSOVIET, TYPE L7.62mm API X54RCHICOM, TYPE 53METERSOR YARDSMETERS YARDS METERS YARDS METERS YARDS METERS YARDS METERS YARDS0 3150 2740 2380 2836 2880100 2780 2620 2510 2550 1950 2000 2562 2
43、575 2620 2640200 2400 2470 2275 2320 1650 1700 2303 2350 2365 2405300 2050 2145 2070 2130 1400 1460 2067 2130 2150 2200400 1750 1845 1875 1940 1190 1275 1850 1925 1940 2005500 1510 1600 1715 1780 990 1080 1654 1735 1745 1820600 1476 1560700 1322 1410800 1194 1275900 1096 11751000 1020 1085REMAINING
44、VELOCITY (F/S) AT SPECIFIC DISTANCETARGETDISTANCE7.62mmAP M61Cal.30Ball M2Cal.30AP M2Cal.50 Ball M2 for:36“ BARRELCal.50 Ball M2 for:45“ BARRELMETERSOR YARDSMETERS YARDS METERS YARDS METERS YARDS METERS YARDS METERS YARDS0 2800 2800 2760 2845 2935100 2560 2565 2540 2565 2535 2560 2700 2710 2785 2800
45、200 2320 2325 2275 2325 2325 2360 2550 2570 2655 2670300 2080 2135 2025 2090 2115 2165 2410 2435 2520 2540400 1850 1915 1175 1865 1915 1985 2275 2310 2385 2425500 1650 1730 1560 1650 1730 1800 2150 2190 2260 2300600 1460 1550 1345 1450 1560 1640 2020 2080 2130 2130700 1295 1375 1175 1270 1390 1490 1
46、900 1970 2010 2060800 1160 1240 1040 1125 1255 1340 1780 1835 1865 1945900 1065 1135 950 1010 1140 1220 1665 1745 1765 18451000 1010 1050 910 940 1070 1130 1550 1640 1655 1735Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-662F15TABLE I. Proj
47、ectile velocities (feet/second) (cont.) .REMAINING VELOCITY (F/S) AT SPECIFIC DISTANCETARGETDISTANCECal.50 AP M2 for:36“ BARRELCal.50 AP M2 for:45“ BARREL12.7mm API&T, B32SOVIET14.5mm API-B32SOVIET14.5mm API-BS-41SOVIETMETERSOR YARDSMETERS YARDS METERS YARDSMETERS YARDS METERSYARDS METERS YARDS0 284
48、5 2940 2690 3280 3280100 2700 2710 2790 2800 2570 2575 3120 3130 3140 3150200 2555 2580 2660 2680 2450 2470 2990 3000 2975 3010300 2430 2455 2525 2560 2325 2360 2840 2870 2825 2875400 2280 2340 2390 2445 2210 2250 2710 2750 2680 2745500 2165 2220 2275 2320 2097 2150 2590 2630 2545 2610600 2040 2100
49、2140 2200 1995 2045 2470 2520 2400 2480700 1925 1985 2030 2100 1890 1950 2340 2410 2265 2340800 1800 1875 1910 1990 1780 1850 2230 2310 2125 2220900 1695 1765 1780 1880 1680 1760 2120 2200 1980 20901000 1570 1665 1680 1780 1580 1675 2000 2100 1860 1970REMAINING VELOCITY (F/S) AT SPECIFIC DISTANCETARGETDISTANCE20mm AP-T M602(HVAP-T DM-43)20mm APM7520mm APT M9549.5“ B
