Abstract
ABSTRACTThe experiment was conducted by the radical collapse of thick-walled cylinders. Optical microscopic examination showed that sample ( = 7.3 × 104 s−1, εef = 0.45) failed to produce adiabatic shear bands (ASBs), while ASBs were obtained in samples ( = 1.48 × 105 s−1, εef = 0.86; = 1.18 × 105 s−1, εef = 0.81), which shows that the energy barrier in shear band formation was decreased with the increase of shear strain rate. With the increase of strain rate, the number of ASBs decreased and the spacing and the average length increased, and the propagation rate of ASBs increased from 213 m s−1 ( = 1.18 × 105 s−1) to 417 m s−1 ( = 1.48 × 105 s−1).
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