|Brake Rotors from this Z06 Corvette were scanned|
Taking a closer look into a drilled hole revealed detailed images of the iron grains pulling directly apart. Had these fractures occurred instantaneously we might expect to see two rigid walls. However, the images suggest these fractures slowly pulled further apart over extended time due to the alignment of the grains normal to the fracture walls. The apparent decrease in diameter between the fracture walls as it protrudes away from the drilled hole simultaneously supports the likelihood that the crack forms over time.