Accession Number : AD0011594


Title :   RAPID EXPANSION OF METAL CYLINDERS UNDER EXPLOSIVE LOADING. 1. STUDIES OF INITIAL EXPANSIONS WITH THE ROTATING MIRROR CAMERA


Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD


Personal Author(s) : Solem, A D ; Singleton, Jr, B N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/011594.pdf


Report Date : 04 Feb 1953


Pagination or Media Count : 30


Abstract : Fragment velocities were determined for 2-in.-inside diameter steel and Al cylinders of various wall thicknesses after detonation of Composition B explosive fillings. The expansion rates of the cylinders (with wall thicknesses between 0.0 to 0.5 in.) were studied by using a rotating mirror-slit camera. These data were for an accurate determination of initial fragment velocities and accelerations. A comparison was made of the observed values, the theoretical Gurney velocities, and the fragment velocities measured on the NOL fragment velocity range. By proper choice of the Gurney constant, the velocities calculated by the Gurney formula can be brought into good agreement with the observed values in the region above 0.05-in. wall for steel, and 0.1-in. wall for Al. For thinner cases the observed velocities diverge considerably from the Gurney predicted values. Considerations are also discussed on the effectiveness of the rotating mirror camera in fragmentation work and the errors and assumptions which enter into interpretation of the data obtained.


Descriptors :   *EXPANSION , VELOCITY , MIRRORS , THICKNESS , FRAGMENTATION , ACCELERATION , ROTATION , FRAGMENTS , DETERMINATION , FORMULATIONS , RATES , ACCURACY , CAMERAS , WALLS


Subject Categories : Explosions


Distribution Statement : APPROVED FOR PUBLIC RELEASE