Filled Crack - A crack-like discontinuity, open to the surface, but filled with some foreign material-oxide, grease, etc.- which tends to prevent penetrants from entering.Fillet - a radius (curvature) imparted to inside meeting surfaces a blended curve joining an internal corner to two lateral surfaces.Field Intensity - A term used to describe the strength of the electromagnetic field.Ferrous - Describing a metal that is more than 50% iron, such as steel, stainless steel, cast iron, ductile (nodular) cast iron, etc.Ferromagnetic Materials - Materials that can be magnetized.Fraction of the test coil area filled by the test specimen. Ferromagnetic - It is a measure of coupling between the coil and test object.It may have a small amount of carbon (less than 0.02 wt%). Ferrite - Essentially pure iron in the microstructure of an iron or steel specimen.Feed-Through Coil - See encircling probe.Fatigue Strength - The maximum stress that can be sustained for a specified number of cycles without failure, the stress being completely reversed within each cycle unless otherwise stated.If the stress is not completely reversed, the value of the mean stress, the minimum stress, or the stress ratio should be stated. Fatigue Limit - The maximum stress below which a material can presumably endure an infinite number of stress cycles.Fatigue Crack - Crack in a material formed because of repeated stress below the maximum stress of the material, rather than because of overload.
Fatigue fractures are progressive, beginning as minute cracks that grow under the action of the fluctuating stresses.
Faraday, Michael - a chemist in England during the early 1800's and is credited with the discovery of electromagnetic induction, electromagnetic rotations, the magneto-optical effect, diamagnetism, and many other discoveries.False Indication - A test indication that could be interpreted as originating from a discontinuity but which actually originates where no discontinuity exists.
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