抄録
Ballistic impact tests were conducted on intermediate purity titanium plate and Ti-6pctAl-4pctV-ELI alloy plate and newly developed Ti-Fe-O-N alloy plate using ogive-shaped projectile with 7. 62mm diameter to study relation between the fracture mechanisms and adiabatic shear band formation The plugging process was dominated by adiabatic shear deformation in localized bands.
Selected data and optical micrographs relating to the adiabatic shear band formation, the variation of depth of penetration and ballistic limit velocity were presented.
The fracture mechanisms associated with the shear localization and fracture process changed from bulging failure to plugging failure by a shocked pressure increase.
The results showed the differences of the fracture mechanisms between two high strength titanium alloys are responsible for significant differences in the elongation of their mechanical property and in the evolution of shear band patterns
It also showed evidence of the long shear band connected from the shocked surface to the bulging region was found in all target plates, but evidence of the long cracks connected did not be found in all target plates at impact velocity just near below each ballistic limits
