Fig. 5.

Characteristics for orientation C: (a) test record, which was stopped after the occurrence of the first three pop-ins; (b) fractograph of the corresponding specimen having distinctive macro-delaminations; (c) magnification of inset-image of (b) showing a stretched zone and local crack propagation through ductile failure; (d) magnification of inset-image of (c) looking at the transition between pre-crack and stretched zone with single micro-delaminations.