Figure 2. Representative SEM micrographs of fracture surfaces. (A) Semi-circular flaw produced by indentation is the crack origin (white box); the adhesive resin island in the middle of fracture surface has some fracture markings and represents a failure mode 2 (x80). (B) Enlargement of white box area of (A) showing the size of the crack semi-minor axis (a = 76.3 µm) (x300). (C) SEM image and x-ray elemental maps (lower right) of fracture surface representing fracture mode 5. The label at the top of x-ray maps indicates the elements and their intensity.