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Shock waves in the  and  directions of single-crystal Al samples were studied using molecular dynamics (MD) simulations. Piston-driven simulations were performed to investigate the split shock-wave regime. At low piston velocities, the material is compressed initially to a metastable over-compressed elastic state leading to a super-elastic single shock wave. This metastable elastic state later collapses to a plastic state resulting in the formation of a two-wave structure consisting of an elastic precursor followed by a slower plastic wave. The single two-zone elastic-plastic shock-wave regime appearing at higher piston velocities was studied using moving window MD. The plastic wave attains the same average speed as the elastic precursor to form a single two-zone shock wave. In this case, repeated collapse of the highly over-compressed elastic state near the plastic shock front produces ultrashort triangle pulses that provide the pressure support for the leading elastic precursor.
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Citation / Publisher Attribution
Journal of Physics: Conference Series, v. 500, art. 172007
Scholar Commons Citation
Zhakhovsky, Vasily V.; Inogamov, Nail A.; Demaske, Brian J.; Oleynik, Ivan I.; and White, Carter T., "Elastic-Plastic Collapse of Super-Elastic Shock Waves in Face-Centered-Cubic Solids" (2014). Physics Faculty Publications. 8.