Marks left on a fatigue fracture surface as a result
of the advance or growth of the fatigue crack
resulting from one load application. To visualize
a single fatigue striation or
even a
series of fatigue striations requires extremely high
magnifications. Individual striations are often
visible at high magnifications in a scanning
electron microscope (SEM).
The yellow marker pictured below traverses
approximately 13 fatigue striations 9.8 microinches
(9.8 X 10-6 inches or 0.0000098 inches).
Photograph A Example of fatigue
striations
as seen through a SEM at a magnification of
10,000x.
