Abstract
Lim proposed a theoretical study on the velocity profile of an explosively-driven flat flyer affected by the rarefaction (or release wave) intrusion during the metal’s projection. This work shows somewhat reasonable agreement in a given range. However, this work is limited only in the early stage of detonation (~3 µs), and the larger scaled flyer projection (or extended time duration) behavior is needed for an engineering perspective. As continued work originating from this investigation, the velocity profile of explosively-driven flyers with different widths is studied based on multiple different approaches which include hydrocode simulation, the Gurney model, and Baum’s side loss correction (or effective charge mass approach), followed by a series of field experiments. In this study, the focus is on the observation of the flat flyer velocity (or terminal velocity) variation, depending on the width of the flyers which vary from 12, 25, 50, and 75 mm (or 100 mm). The terminal velocity profile variation, depending on the flyer width, is observed, and a general trend is identified.
Highlights
The Gurney model provided a great deal of improvement in the understanding of explosively-driven systems, delivering a fundamental insight of the coupling between the explosives and metallic flyer based on the conservation equations
This paper focuses on the observation and description of the two-dimensional effect of the flyer configuration to understand and review the limitation and applicability of the configuration to understand and review the limitation and applicability of the conventionalmethods, methods, while whilealso alsoexploring exploringaamore moreadvanced advancedapproach approachtotoobtain obtain anaccurate accurate conventional of the conventional methods, while exploring a more advanced approach to obtainan an accurate estimation of the flyer projection behavior
This is from a symmetrical configuration with two 10 mm thick steel plates and 20 mm thick EL506A charge in the middle, and it was able to observe the same behavior of the flyer projection velocity variation depending on the flyer width
Summary
The Gurney model provided a great deal of improvement in the understanding of explosively-driven systems, delivering a fundamental insight of the coupling between the explosives and metallic flyer based on the conservation equations It introduced a well-known parameter of the mass of the flyer divided by mass of the explosive charge (M/C) ratio, and it became a common gate-way into related research. Another limitation of the Gurney model is that the model originated from a one-dimensional point of view, and prohibits a detailed understanding of the side rarefaction (or edge effect) upon detonation of the charge, which eventually will affect the terminal velocity This is an important subject for applications where the speed of projection is considered as the measure of performance, i.e., shaped charges, fragmentation of. M is the mass of the flyer, 2E is the Gurney velocity constant, and v is the speed of the flyer
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