Pure shear plastic flow and failure of titanium alloys under quasi-static and dynamic torsional loading

The pure shear responses of Ti6Al4V alloy and Ti3Al2.5V alloy, conceived for unique applications in jet engine components, are compared using Digital Image Correlation technique from quasi-static (10 ?3 /s), medium strain rate 1 /s) high rates 3 /s). A series bespoke torsion tests have been performed on a screw driven mechanical system, fast hydraulic Instron machine Campbell split Hopkinson bar, equipped with speed photographic equipment. Observations provided the dependence relation failure at rates. constitutive relationships including modulus, yield stress both alloys location initiation, four camera system. presents lower flow sensitivity higher ductility, as opposed to limited plastic deformation capacity. Associated modest estimated overall temperature rise until final collapse specimen, ductile brittle fail by adiabatic banding This is different void growth induced mild quasi-isothermal condition. present results show general description engineering design. Likewise, this study will guide characterization current future developed impact resistant alloys. • stress-strain relatively can be measured techniques. Dynamic torsional relationship similar that under simple shear, would compression Adiabatic band occur ductility low almost no ignorable thermal softening effect. material process