The effects of axial length on the fracture and fragmentation of expanding rings

D.R. Jones, D.E. Eakins, A.S. Savinykh, S.V. Razorenov
2012 EPJ Web of Conferences  
Rings of Ti-6Al-4V with aspect ratios (wall thickness:axial length) of 1:1, 1:2 and 1:4 have been expanded to failure at radial strain ratesε r ∼ 1 × 10 4 s −1 using 4340 (EN24T) steel and Cu-ETP cylindrical drivers containing a column of RDX. Expansion velocity was measured using VISAR enabling calculation of the stress-strain history of the ring alongside fragment recovery with up to 98% original ring mass recovered. Using the recovered samples average fragment length and mass and final
more » ... ass and final strain have been measured along with analysis of the fracture sites to determine the active failure mechanisms. Perfect rings (aspect ratio 1:1) were found to undergo necking before failure, whereas the longer rings failed though ductile tensile cracking at 45 • to the radius. This data is then compared with finite element analysis results.
doi:10.1051/epjconf/20122601032 fatcat:t72n7jxforfprcbxitzf6rb7qy