Simulation and Measurement of Fragment Velocity in Exploding Shells

10-2-1.jpg
10-2-1.jpg

Simulation and Measurement of Fragment Velocity in Exploding Shells

9.95

Author(s): Nigel Davies; Chung Kiat Lee; Joanna Szmelter
No pages: 7
Year: 2007
Article ID: 10-2-1
Keywords: firepower and protection, projectiles
Format: Electronic (PDF)

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Abstract: This paper presents simulations of initial velocity distribution of fragments for non-trivial shapes of casing in exploding shells, using a semi-empirical computational model. The key to the proposed approach is the use of transformation of a general geometrical shape to a hollow sphere followed by an application of Gurney principles in the transformed domain. The model is validated against an analytical model for a finite cylindrical charge bounded by a cylindrical shell and identical end-plates. A computation for 105-mm shell with steel casing and aluminium fuze illustrates aspects involved in reliable comparisons of fragmentation models against a standard trial data. Further, a simple and inexpensive experimental procedure based on a pin gauges measurement is described. Measurements obtained for short cylinders and an 81-mm mortar bomb are compared with numerical predictions. The described model responds to the need for an improved, fast assessment tool applicable to practical designs involving geometrically complex multi-material shells. The results highlight a requirement for quality experimental data obtained for complex shapes.