Abstract
Methods of investigating the plastic flow of materials at high rates are reviewed, and experiments are described in which thin-walled tubular specimens were subjected to dynamic torsional loading. These experiments were performed using a modified version of a torsional Hopkinsonbar apparatus used in earlier work. The results show that, at strain rates of order 103 sec−1, the stress-strain curve of the alloy tested does not differ significantly from that found at 10−3 sec−1. In tests involving the propagation of a stress increment, however, it was found that the speed of propagation was that of elastic shear waves, indicating that the initial response of the material is essentially rate dependent.
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Nicholas, T., Campbell, J.D. Shear-strain-rate effects in a high-strength aluminum alloy. Experimental Mechanics 12, 441–447 (1972). https://doi.org/10.1007/BF02328813
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DOI: https://doi.org/10.1007/BF02328813