Abstract
This paper describes the experimental results obtained for polycrystalline copper at two very different strain rates and at large shear strains. Thin-walled tubular specimens were tested up to a shear strains. Γ ≈ 2.5 on closed-loop testing machine with low strain rate of the order Γ ˙ ≈ 10 − 3 s − 1 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203749173/55467cee-d444-4710-99d4-2dc1e30909b4/content/eq1890.tif"/> . The second series of tests was performed with the Split Hopkinson Torsional Bar (SHTB) at strain rate Γ ˙ ≈ 300 s − 1 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203749173/55467cee-d444-4710-99d4-2dc1e30909b4/content/eq1891.tif"/> . Specimens were loaded from consecutively 6 to 8 times to reach a shear strain Γ ≈ 3.0. Low strain rate/high strain rate tests have also been performed. All results for copper indicate a very high effect of rate sensitivity of strain hardening at large strains.
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