Dynamic strength and edge effects at spall fracture for titanium alloys of varying oxygen content

The results of VISAR free-surface velocity measurements for Ti-6Al-4V alloys with different oxygen content and the HEL, the spall strength, the spall fracture energy data are presented. The peak shock stress was varied from 4 to 75 GPa, the load duration from ∼10−7 s to ∼10−5 s. The Hugoniot elastic limit grows by ∼20% with increasing the oxygen content from 0.105% up to 0.24%. The alloy with the largest oxygen content exhibits also a greatest viscosity. The measurements have not revealed a notable variations in the spall strength magnitudes as a function of the oxygen content. The specific energy of spall element separation is practically the same for the all three types of samples tested.