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Abstract

The damage evolution in a material during quasi-static and dynamic tests can be studied by interrupting the test at predetermined elongation values and post-mortem analyses of the specimens. While it is straightforward to interrupt quasi-static tests at a predetermined level of elongation, this interruption presents difficulties at high-strain-rate conditions. In the present work, tests at high strain rate using a split Hopkinson tensile bar have been interrupted by an interruption mechanism as a modification of this device. This interruption mechanism is based on the use of two rings of a soft material that absorb the impact energy by deforming plastically. The influence of the dimensions of damper rings on the stress waves and also the ability of the system to support the interruption of the deformation process were considered in the numerical analyses and verified by the experimental results. The relationship between the recommended ring thickness and maximum reached strain for aluminium alloy A16082 will be presented. Finally, the influence of strain on the damage evolution of the ZC71 particulate-reinforced magnesium matrix was reported.

Keywords

strain evolution dynamic test deformation process interruption mechanism split Hopkinson tensile bar

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Numerical simulation and experimental study of a mechanism for Hopkinson bar test interruption

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