Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Filler: A relatively inert material added to a plastic mixture to reduce cost, to modify mechanical<br />
properties, to serve as a base for color effects, or to improve the surface texture.<br />
Filler Ply: Additional patch to fill in a depression in repair or to build up an edge.<br />
Fillet: A rounded filing of the internal angle between two surfaces of a plastic molding.<br />
Filling Yarn: It is the transverse threads (or fibres) in a woven fabric. These are the fibres,<br />
which running perpendicular to the warp.<br />
Film Adhesive: An adhesive in the form of a thin, dry, resin film with or without a carrier,<br />
commonly used for adhesion between layers of laminates.<br />
Final Entry Point: The spot where the lightning flash channel last enters the aircraft (usually a<br />
trailing edge).<br />
Final Exit Point: The spot where the lightning flash channel last exits .the aircraft (usually a<br />
trailing edge).<br />
Finish (or Size System): A material, with which filaments are treated, which contains a coupling<br />
agent to improve the bond between the filament surface and the resin matrix in a composite<br />
material. In addition, finishes often contain ingredients which provide lubricity to the filament<br />
surface, preventing abrasive damage during handling, and a binder which promotes strand<br />
integrity and facilitates packing of the filaments.<br />
First Return Stroke: The high current surge that occurs when the leader completes the<br />
connection between the two charge centers. The current serge has a high peak current, high rate<br />
of change of current with respect to time and a high action integral.<br />
Fixed Effect: A systematic shift in a measured quantity due to a particular level change of a<br />
treatment or condition<br />
Finite Element Analysis (FEA): A process of selecting the optimum combination of materials<br />
in a composite based on software analysis.<br />
Fire Point: The lowest temperature at which a liquid in an open container will give off enough<br />
vapors to continue to burn once ignited. Fire point generally is only slightly higher than flash<br />
point.<br />
Fish Eye: It is a circular separation in a gel coat film generally caused by contamination such as<br />
silicone, oil, dust, and/or water.<br />
Flame Resistance: It is ability of a material to extinguish flame once the source of heat is<br />
removed.