Wave speeds in single-crystal and polycrystalline copper

•“Top hat” target design and planar impact provided precise timing information.•Error determined through a comparison of ambient and high-pressure sound speeds.•Differences in shock Hugoniot values between orientations within estimated error. There is a need in the scientific community to improve pr...

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Bibliographic Details
Published in:International journal of impact engineering 2020-05, Vol.139 (C), p.103506, Article 103506
Main Authors: Thomas, Sarah A., Hixson, Robert S., Hawkins, M. Cameron, Strand, Oliver T.
Format: Article
Language:English
Subjects:
Copper
Crystal structure
Crystals
Elastic waves
Empirical analysis
Error analysis
Hugoniot
Hugoniot curves
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Polycrystals
Single crystal
Single crystals
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Summary:•“Top hat” target design and planar impact provided precise timing information.•Error determined through a comparison of ambient and high-pressure sound speeds.•Differences in shock Hugoniot values between orientations within estimated error. There is a need in the scientific community to improve predictive hydrodynamic codes. Empirical data are necessary to improve and constrain these models. This work considers the potential differences between the shock Hugoniots of single-crystal and polycrystalline copper. Polycrystalline materials are composed of grains of randomly oriented single crystals, so knowledge of these is necessary to build mesoscale representations of bulk materials. In this work, we measure the shock speeds of three different orientations of single-crystal copper, [100], [110], and [111], as well as polycrystalline copper. Symmetric planar impacts with a “top hat” target design provide timing information for the elastic and plastic waves. We use a comparison of ultrasonically measured ambient longitudinal sound speeds with the elastic wave speeds at pressure to constrain error bars for our analysis. Our results show that differences between the various orientations of single-crystal copper and polycrystalline copper are within the error of the experiment.
ISSN:0734-743X
1879-3509
DOI:10.1016/j.ijimpeng.2020.103506