Ultra High speed imaging of dynamic fracture in transparent Spinel ceramic

Ultra High speed imaging of dynamic fracture in transparent Spinel ceramic. The videos where film at frame rate of 2,5,7.5 and 8 milion frame per second. The Spinel bar, 3mm thick, is standing upright and unsupported. It is shock-loaded by a steel bar (Hopkinson) on the right hand side. The crack is initiated at the opposite left side, which is in tension.