Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Fracture: When a surface ruptures without the laminate completely separating, or where there is<br />
complete separation of a body because of external or internal forces.<br />
Fracture Stress: The true, normal stress on the minimum cross-sectional area at the beginning<br />
of fracture.<br />
Fracture Toughness: The damage tolerance of a material containing initial flaws or cracks.<br />
Used in aircraft structural design and analysis.<br />
FRP: Acronym for fiber glass-reinforced or fiber-reinforced plastic, polymer or polyester.<br />
Fuzz: Creel Fuzz - In glass fiber manufacturing, the broken filaments found around and on a<br />
roving creel. Chopper Fuzz - In Composite Fabrication, the broken filaments found around the<br />
glasscutter or chopper. See Fines. In the field, the broken filaments found around a roving pallet.<br />
Fuzz Plug: Small, broken, compacted filaments of glass that collect inside the guide eye tubes<br />
feeding the chopper, preventing glass from running through.<br />
Gate: Point at which molten thermoplastic enters the injection molding tool cavity.<br />
Gel: A partial cure of plastic resins; a semisolid, jelly-like state similar to gelatin in consistency.<br />
Gel: The initial jelly-like solid phase that develops during a resin’s formation from a liquid state.<br />
It is a semisolid network of solid aggregates in which liquid is held.<br />
Gelation: The point during resin cure when viscosity has increased so much that resin barely<br />
moves when probed with a sharp instrument.<br />
Gel Coat: Surface coat of a specialized, quick-setting polyester resin, either colored or clear,<br />
providing cosmetic enhancement and weather ability to a fiberglass laminate. Gel coat is an<br />
integral part of the finished laminate.<br />
Gel Point: When a liquid begins to exhibit pseudo-elastic properties. This stage may be<br />
conveniently observed from the inflection point on a viscosity time plot.<br />
Gel Time: Time required to change a flowable liquid resin into a non-flowing gel.<br />
GFRP: Glass fiber-reinforced plastic, polymer or polyester.<br />
Glass Blends: When several different fiber types, i.e. different lengths and diameters, are<br />
blended in the fiber slurry.<br />
Glass Content: Percentage of glass in the compound.<br />
Glass Fiber Wet-Process: Process of forming a glass mat on modified papermaking equipment.