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Old March 6th, 2015, 21:56   #70
docholiday
docholidayy
 
Join Date: Feb 2012
Location: Toronto
ThunderCactus, good job putting this together.

I think MIL-DTL-43511D has been replaced by MIL-PRF-32432.

From Revision product description for the Desert Locust:
Quote:
EXCEEDS U.S. MILITARY BALLISTIC IMPACT REQUIREMENTS FOR GOGGLES (MIL-PRF-32432, CLAUSE 4.4.3.3.5, SUPERSEDING FORMER MIL-DTL-43511D, CLAUSE 3.5.10)
EXCEEDS ANSI Z87.1-2010 BALLISTIC IMPACT AND OPTICAL REQUIREMENTS
http://www.revisionmilitary.com/prod...goggle-system/



U.S. MILITARY BALLISTIC IMPACT REQUIREMENTS FOR GOGGLES MIL-PRF-32432, CLAUSE 4.4.3.3.5 as outlined below:

Quote:
4.4.3.3.5 Ballistic fragmentation protection, Class 2 and Class 3. Class 2 Goggles shall be hit three (3) times with a 0.22 caliber, 17 (+/- 0.5) grain, T37 shaped projectile at 550-560 ft./sec, once on the left side and once on the right with both impacts at normal incidence (0 degree obliquity) to the primary lens at a location within the critical area. The third shot shall be in the center at the vertical center line at normal incidence (0 degree obliquity) to the primary lens. Class 3 shall be impacted in the same manner, with the exception that the center shot shall not be taken. The critical area is defined as a circle having a 20 mm radius centered on the horizontal centerline and 32 mm from the vertical centerline). A shot shall be considered valid if the projectile hits within the critical area or within 10 mm of the designated impact point, if the velocity requirements have been met for the shot (i.e., considered “fair” per paragraph 4.4.3.3.2), if obliquity requirements have been met for the shot, if the impact location is at least two projectile diameters (1.09 cm) away from the edge of a lens, and the projectile does not impact the frame. Projectiles shall be a fragment simulating project (FSP) of shape and dimensions as specified in Figure 4 and shall be manufactured from cold rolled, annealed steel conforming to composition 4340H; the projectile hardness shall be Rockwell C30 (+/-2).
Projectiles will be visually inspected for damage in between each shot. Projectiles may be reused after they have been fired unless visual observation indicates that the projectile has been damaged or deformed. The test item shall be mounted on an EN head form (small or medium) in the as-worn position. Compressed gas propulsion (N2 or He) of the projectile may be used. The test item shall be removed after each impact for inspection of both the sample and the witness sheet and any other observations noted. Damage to the witness sheet or eyewear and all observations (i.e. breakage, cracks, complete dislodgement, partial dislodgement, delamination, flaking, etc.) shall be noted. Ballistic fragmentation testing shall be conducted on a sample size of ten (10) for each configuration tested initially, and a sample size of three (3) for each post exposure (such as post chemical and post environmental). The test shall be considered a failure if one or more of the following occur:
1) if the witness sheet is perforated or if there is a complete penetration of the test item, 2) if the primary lens is cracked, fractured, or shattered,
3) if one or more fragments become dislodged on the inside of the eyewear (to include coatings)
4) if eyewear component needed to retain the eyewear on the head becomes completely separated from the eyewear
5) if the primary lens becomes completely separated from the eyewear
6) if the eyewear falls off the head form
7) if the inside laminate is cracked and results in a loose flap of material larger than the diameter of the projectile (for laminated lens structures only)
A lens crack is defined as a fissure that propagates beyond the impact site from one surface of the lens to the other. Petalling is not considered a crack.
http://everyspec.com/MIL-PRF/MIL-PRF...F-32432_45247/
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