Effects of Filler Material on Bomb Fracture
Final rept. 13 Jun 1968-12 Jan 1969
AVCO GOVERNMENT PRODUCTS GROUP LOWELL MA AVCO SPACE SYSTEMS DIV
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A six month analytical program was undertaken which investigated the effects of the explosive filler material on the structural failure of bomb casings during impact and penetration into hard targets. A typical cylindrical shell, similar to the present BLU-31B bomb was studied. Both constant and linearly varying wall thicknesses were investigated. To obtain a basic understanding of the filler effect, only an axial load, suddenly applied and held constant, was included. A finite element solution was used to obtain resulting stresses and displacements within the casing. Results indicate the large effect of the filler on the hoop stresses. These stresses are of sufficient magnitude to induce casing failure based on current bomb designs and impacting conditions against concrete targets. Results are presented for a typical Composition B explosive filler material. Hoop stress magnitudes may be obtained for any other filler material, using given relationships between its bulk modulus and density properties compared to the Composition B properties.
- Aerial Bombs