Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Copolymer: A resin produced by copolymerization. A process in which unlike molecules are<br />
arranged in alternate sequence in a chain.<br />
Core: A low-density material used between two FRP skins. Examples are end-grain balsa wood,<br />
urethane foam, PVC foam and various honeycomb materials. The central member, usually foam<br />
or honeycomb, has a sandwich construction to which the faces of the sandwich are attached or<br />
bonded. It is the central member of a plywood assembly. A channel in a mold for circulation of<br />
heat transfer media. A device on which prepreg is wound.<br />
Coronizing: Continuous heat cleaning and weave setting.<br />
Corrosion Resistance: A material’s ability to withstand ambient natural factors or those of a<br />
particular artificially created atmosphere, without degrading or changing in properties. For<br />
metals, this could be pitting or rusting; for or organic materials, it could be crazing.<br />
Coupling Agent: Any chemical substance designed to react with both the reinforcement and<br />
matrix phases of a composite material to form or promote a stronger bond at the interface.<br />
Crazing: It is the cracking of gel coat or resin due to stress. It is the region of ultra-fine cracks,<br />
which may extend in a network on or under the surface of a resin or plastic material. It may<br />
appear as a white band. Often found in a filament-wound pressure vessel or bottle.<br />
Creel: Glass Fiber Manufacturing - A framework used to hold forming cakes so they can be<br />
wound or roved into roving doffs. Creels generally hold 10 to 33 forming cakes that are replaced<br />
randomly when they run out or as doffs are roved.<br />
Composite Fabrication: The area in which pallets of roving are placed and "threaded up"<br />
through metal tubes or guide eyes to a chopper.<br />
Creep: The slow movement of a plastic material with time.<br />
Creep, Rate of: Rate of the slope of the creep-time curve at a given time. It is deflection with<br />
time under a given static load.<br />
Cross-linking: Chemical links between molecule chains in thermosetting resins. Styrene<br />
monomer is a cross-linking agent in polyester resins.<br />
C-Stage: Final stage in the reaction of certain thermosetting resins in which the material is<br />
practically insoluble and infusible.<br />
CTE: see Coefficient of Thermal Expansion<br />
Cure: Cross-linking or total polymerization of a resin’s molecules that alters a material’s<br />
properties, changing it from a liquid to a solid.