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Mechanical and ballistic tests were performed on Ti-6Al-4V titanium alloy subjected to three heat treatment conditions. For the samples annealed above the beta transition temperature, a loss in ballistic performance was noted and the samples exhibited little bulk deformation and bulging, but extensive adiabatic shear banding. Samples annealed below the beta transus temperature exhibited extensive bulk deformation and rear surface bulging, delaminations perpendicular to the penetrator path with shear bands parallel to the direction of impact. In mechanical tests, dynamic strength and failure behaviour of Ti-6Al-4V under compression and biaxial compression/shear loading has been investigated. Scanning electron microscopy (SEM) was used to correlate deformation structures of shear cracks from ballistic tests with that of shear laboratory specimens. Indications of an relationship between the ballistic performance and mechanical behaviour under compression/shear loading of different heat treated titanium targets were noted, e.g. dynamic strength and sensitivity to adiabatic shear failure

Analysis of Shear Band Effects in Titanium Relative to High Strain-Rate Laboratory/Ballistic Impact Tests