Penetration of 15-Grain Bomb Fragments into Wallboard
Final rept. 1 Jun 1969-1 Jan 1970
AIR FORCE ARMAMENT LAB EGLIN AFB FL
Pagination or Media Count:
The primary objective of this program was to define a function between the striking velocity for 15-grain random shaped bomb fragments and their depth into the wallboard trade named Nu-Wood. These fragments were fired from a 20mm Mann Barrel into bundled Nu-Wood. The striking velocities were in the 500 ftsec to 5000 ftsec range. The graph of fragment striking velocity as a function of depth into Nu-Wood showed a wide range of depths for approximately 1000 ftsec, 3000 ftsec, and 5000 ftsec striking velocities. A least squares curve would not be valuable since the penetration spread is too wide at given velocities. Fragment penetration into Nu-Wood from firing cylinders does not give a realistic picture of 15-grain actual bomb fragmentation spread. The fragment penetration into Nu-Wood was found to be a momentum as opposed to a kinetic energy effect. The depth of penetration is not a primary function of the presented area and perimeter of the impacting fragments for 3000 ftsec and 5000 ftsec velocities. Shots at 1000 ftsec reveal a dependence on the presented area and perimeter of the impacting fragment.
- Aerial Bombs