Stress Fractures in Metal

Seen in the video is an example of a stress fracture occurring in aluminum. Stress fractures are common and are caused by metal fatigue through excess use or strain.

Stress Fracture

When observing fractures on a microscopic scale, self-similarity becomes apparent. In the above image, there appears to be stress fractures inside of the larger crack.

When viewed from a mathematical standpoint, cracks propagate in a nearly linear fashion. They can be predicted to a certain extent within bounds, as cracks tend to stay along the same path. These properties show that they can be thought of as fractals.

For more information on fatigue, view the notes at the link below from a Materials Science course:
http://www.sv.vt.edu/classes/MSE2094_NoteBook/97ClassProj/anal/kelly/fatigue.html

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