Hugoniot Elastic Limit and Spall Strength of Aluminum and Copper Single Crystals over a Wide Range of Strain Rates and Temperatures

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Abstract
Anomalous rise of the Hugoniot elastic limit (HEL) with increasing temperature was observed for aluminum and copper single crystals. Within the temperature range from 20°C to 650°C the HEL of aluminum single crystals increased from 0.12 to 0.96 GPa for 3 mm thick samples and to 3 GPa for ∼0.25 mm thick samples. The spall strength decreased from 2.3 GPa and 3.2 GPa at room temperature to 1.3 GPa and 2.2–3 GPa near the melting temperature for thicker and thinner samples, respectively. For copper single crystals a HEL of 2.6 GPa was recorded at 833°C; whereas the spall strength decreased from 5.4 GPa at room temperature to 4.8 GPa at 485°C.