Combined Compression and Shear Impact Response of Polycrystalline Metals at Elevated Temperatures
In this paper, we present results from a series of elevated temperature combined pressure-and-shear plate impact (PSPI) experiments conducted on polycrystalline commercial purity aluminum (99.999%) and magnesium (99.9%) samples at temperatures ranging from 23 °C to 320 °C. These experiments are designed to study the effect of temperature on flow stress of fcc and hcp metals at ultra-high shear strain rates (greater than 105/s) and high shear strains (approaching 50%). In order to conduct this research, the single-stage gas-gun facility at Case Western Reserve University was modified to include a breech-end sabot heater system and a fully fiber-optics based combined NDI/TDI interferometer. The flow stress of commercial purity aluminum and magnesium, as inferred from the transverse particle velocity record measured at the free surface of a fully elastic Tungsten Carbide (WC) target plate reveal that both sample materials soften when heated to temperatures approximately 50% of their melt temperatures.
KeywordsCombined compression-and-shear plate impact High shear strain rates Elevated temperatures Dynamic flow stress Pure aluminum Pure magnesium Viscous drag
The authors would like to acknowledge the financial support of the U.S. Department of Energy through the Stewardship Science Academic Alliance (DE-NA0001989 and DE-NA0002919).
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