Journal
JOURNAL OF DYNAMIC BEHAVIOR OF MATERIALS
Volume 6, Issue 1, Pages 24-33Publisher
SPRINGERNATURE
DOI: 10.1007/s40870-019-00223-w
Keywords
High Rate Testing; Kolsky Bar; Metal Plasticity
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Several miniature Kolsky bars are used to obtain stress-strain curves for nanocrystalline Cu-10Ta over a range of high strain-rates. The smallest bar (steel) has a 305 mu m diameter, and achieved rates up to 700x10(3)/s. Different sample sizes are needed to obtain different strain-rates, and it is shown that there is no appreciable sample size effect when different sizes are tested at similar strain-rates, even though the sample sizes vary by over an order of magnitude. No significant increase in strain-rate sensitivity is noted over the strain-rate range studied, i.e., the strength increases linearly with the logarithm of strain-rate from 0.001/s to 700 x 10(3)/s.
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