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17A) was invented by Meyer [83] and used by Meyer and Staskewitsch [84] and Meyer et al. [27]. The advantage of this specimen geometry is to reach a wider differentiation of materials in contrast to plain compression loading. For this reason, the usual compression specimen is inclined a few degrees from the loading axis with the effect of an enhanced multi-axial compression/shear loading. Meyer and Halle [85] observed the stress distribution in a compression/shear specimen (diameter 6 mm, height 6 mm, inclination 6 ) and its dependence on axial deformation.

45% carbon steel at the beginning of the localization are about 200À250 C, 500 C at the beginning of the post-localization phase and 850 C at the end of the post-localization phase. Xue and Gray [45] investigated the annealed AISI 316L stainless steel in a Hopkinson bar assembly using hat-shaped specimens with a certain amount of compressive stress. They characterized the shear band formation through deformation steps with various loading times. Comprehensive examinations of the microstructure, including TEM observations, of this steel was done by Xue et al.

13] and Hartley et al. [14] describe the principle of the torsional Kolsky bar. The torsional Hopkinson bar set-up consists of two bars: the incident bar and the transmission bar. The torque can be stored in the incident bar or can be provided through a flying wheel. Strain rates between 102 and 103 s21 can be reached. Marchand and Duffy [15] determined the shear-stressÀshear-strain behaviour of a HY100 steel with a torsional Kolsky bar. The same specimen geometry was used by Hwang et al. [16].

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