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The development of shear bands was determined by microscopy and finite element simulations of the compression/shear specimen. Pursche [36] and Pursche and Meyer [37] examined different quenched and tempered steels with different heat-treatment conditions with a hardness range between 300 and 600 HB. The propensity of adiabatic shear failure of the materials was determined with the bi-axial dynamic compression/shear test. 24). Under static loading, both tempering conditions can be deformed to the prescribed deformation limit without failure.

Under this condition, adiabatic shear failure often initiates. This failure perhaps starts on the outer surface under the influence of tension stresses and propagates to the inner surface by changing the mode into an adiabatic shear band development. According to Bai and Dodd [8], aluminium and copper fail by a ductile mechanism, and titanium alloys and uranium alloys exhibit brittle failure behaviour at cylinder explosive tests. Steels can exhibit a ductile or brittle behaviour, dependent on heat treatment.

They measured the local temperature on the surface and determined the strain distribution during the shearing process, and, respectively, the shear band formation process. Similar investigations with the same test procedure and specimen were done on AISI 4340 steel by Mgbokwere et al. [17]. With this type of torsion specimen, Duffy and Chi [10] and Lee and Lin [18] investigated the dynamic torsion behaviour of TiÀ6AlÀ4V in unaged and overaged (formation of precipitations) conditions, each with two different initial microstructures.

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Adiabatic shear localization : occurrence, theories and applications by coll.

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