Mach Stem Characterization in MBAR Designs Using RSR Powder
The experimental studies used in this investigation are based in part on the mach stem lens formation work by C. E. Morris, R. G. McQueen and S. P. Marsh1. One of the fortuitous aspects of the cylindrical explosion design is its suitability as a screening tool with its very high success rate of recovery. The designs allow the experimenter in one shot to observe a wide variety of pressure and strain variables. The authors2 have shown the effectiveness of this technique using solid specimens of 304 stainless steel. The effect on powder studies here is more complex, and it will be shown that the mach stem melt zone size and location is a function of several additional variables. The unique microstructure of the Rapid Solidification Rate (RSR) powder was chosen to help characterize and deliniate the effects. It should be emphasized that the powder was selected to help in the modeling of the formation of the mach stem zone and that this technique is not particularly used or recommended to compact RSR powder. In addition, the conditions explored here are in excess of those normally used to compact metallic powders.
KeywordsNickel Convection Explosive Compaction Cylin
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