Spallation strength of single crystal and polycrystalline copper D. L. Tonks, D. J. Alexander, S. A. Sheffield, D. L. Robbins, A. K. Zurek and W. R. ThissellJ. Phys. IV France, 10 PR9 (2000) Pr9-787-Pr9-792DOI: https://doi.org/10.1051/jp4:20009130