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The hat specimen is often used by Meyers [28À31] and Beatty et al. 9). The advantage of the hat-shaped test is that it can be used to produce shear bands even in very ductile materials in a Hopkinson Compression Set-up and that a comparison between small and larger failure strains can be made [33]. Due to the geometry, very high strains at high strain rates can be reached, but the shear-stress measurement is influenced by edge effects. The shear deformability can be measured and assessed. To investigate the microstructure of shear band formation, the displacement of the hat specimen can be limited easily in the axial direction by using stopper rings.

As the result of this test, it can be determined whether or not there is an occurrence of adiabatic shear failure. 22 Dependence of compression/shear stress ratio in a compression/shear specimen at two different locations, according to Meyer and Halle [85]. 23 Influence of inclination of the compression/shear specimen on failure strain performed in a drop-weight test, according to Meyer et al. [86]. 24 Compression stressÀstrain behaviour of two tempering conditions at bi-axial compression/shear test at static and dynamic loading, according to Pursche [36].

Compression Test The dynamic compression test method is used frequently to test the susceptibility of materials to the occurrence of adiabatic shear failure. Only a simple specimen geometry is necessary, and the results are straightforward for engineers. Test rigs such as the split-Hopkinson pressure bar (SHPB) and the drop-weight tower are common. 18), strain rates of up to 104 s21 are possible by use of small specimens (about 1 mm long). A further assembly can be a gas or electromagnetic gun, which can provide a very high loading velocity, strain rates up to 106 s21 and high pressure.

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


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