New advanced numerical computer model enabling accurate simulation of fragmentationparameters of large L/D explosively driven metal shells has been developed and validated.The newly developed large L/D multi-region model links three-dimensional axisymmetrichigh strain high strain-rate hydrocode analyses with the conventional set of Picatinny ArsenalFRAGmentation (PAFRAG) simulation routines. The standard PAFRAG modelingtechnique is based on the Mott’s theory of break-up of idealized cylindrical “ring-bombs”, inwhich the length of the average fragment is a function of the radius and velocity of the shellat the moment of break-up, and the mechanical properties of the metal. In the newlydeveloped multi-region model, each of the shell region, the break-up is assumed to occurinstantaneously, whereas the entire shell is modeled to fragment at multiple times, accordingto the number of the regions considered. According to PAFRAG methodology, the requiredinput for both the natural and the controlled fragmentation models including the geometryand the velocity of the shell at moment of break-up had been provided from the hydrocodeanalyses and validated with available experimental data. The newly developed large L/Dmulti-region PAFRAG model has been shown to accurately reproduce available experimentalfragmentation data.
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