Tape Casting Technique for Fabrication of Graded-Density Impactors for Tailored Dynamic Compression
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0987-PP01-09
Tape Casting Technique for Fabrication of Graded-Density Impactors for Tailored Dynamic Compression L. Peter Martin, Jeffrey H. Nguyen, Jeremy R. Patterson, Daniel Orlikowski, Palakkal P. AsokaKumar, and Neil C. Holmes Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA, 94551
ABSTRACT Recently, the use of graded density impactors for dynamic compression experiments has received increasing interest. These gas gun experiments have demonstrated complex loading paths which can last microseconds, and may be capable of bridging the timescales of existing static and dynamic compression experiments. A tape casting technique has been developed for fabrication of the impactors. In the technique, a series of tapes were prepared in the Mg-Cu system with compositions ranging from 100% Mg to 100% Cu. The tapes were characterized for their density and sound wave velocity. Impactors were fabricated by punching individual layers from the tapes, stacking and laminating them, removing the organic matrix, and hot-pressing the laminated structure. The density profile is determined by the order in which the tapes are stacked in the laminate and is therefore highly flexible. The resultant thickness and average density of the impactors are consistent with the data for the individual layers. Impactors were characterized for uniformity by ultrasonic C-scan and white light interferometry. Dynamic compression experiments were performed on a two-stage helium gas gun using the graded density impactors. Results will be presented and discussed. INTRODUCTION Light-gas guns have historically been used to perform shock-compression experiments on a variety of materials.[1] In these experiments, a projectile (impactor) is accelerated to high velocity using a combination of explosive charge and compressed gas, then impacts a target material to generate high pressures, potentially in excess of 750 GPa. The impact typically generates strong shock waves in the target material, which reach peak pressures in
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