Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Bushing Tip: It is a small tapered protrusion on the bottom of bushings, each containing an<br />
orifice through which molten glass flows and from which continuous filaments are drawn.<br />
Cabled Yarn: The yarn that is plied more than once or made by plying two or more previously<br />
plied yarns.<br />
Carbon: Element that provides the backbone for all organic polymers. Graphite is a more<br />
ordered form of carbon. Diamond is the densest crystalline form of carbon.<br />
Carbon-Carbon: Composite material consisting of carbon or graphite fibers in a carbon or<br />
graphite matrix.<br />
Carbon Fiber: Fiber produced by the pyrolysis of organic precursor fibers, such as rayon,<br />
polyacrylonitrile (PAN), and pitch, in an inert environment.<br />
Carding: It the process of untangling and partially straightening fibers by passing them between<br />
two closely spaced surfaces which are moving at different speeds of which one or more is<br />
covered with sharp points, thus converting a tangled mass of fibers into a filmy web.<br />
Casting: Process of pouring resin, fillers and/or fibers into a mold vs. building up layers through<br />
lamination. Casting results in physical properties that are different than those resulting from<br />
lamination.<br />
Catalyst (Hardener): A substance that markedly speeds up the cure of a compound by<br />
decomposing in the presence of a promoter to release active oxygen radical. Catalyst content can<br />
vary from 0.2% to 2.0% with higher catalyst levels giving faster gel times. Examples are methyl<br />
ethyl ketone peroxide, benzoyl peroxide.<br />
Catastrophic Failures: Totally unpredictable failures of a mechanical, thermal, or electrical<br />
nature.<br />
Catenary: A consolidated group of individual strands which, when checked between two fixed<br />
points of length, exhibit strands of different lengths. The resulting curve between fixed points of<br />
the inextensionable material is defined as catenary. The amount of catenary is measured by the<br />
distance between the topmost and lowermost strands when stretched between two fixed points.<br />
Caul Plates: Smooth metal plates free of surface defects with the same size and shape as a<br />
composite lay-up that contacts the lay-up during curing. Caul plates transmit normal pressure and<br />
temperature to the finished laminate while providing it with a smooth surface.<br />
Cavity: Space inside a mold in which a resin or molding compound is poured or injected. It is<br />
the female portion of the mold. That portion of the mold that encloses the molded article (often<br />
referred to as the die). Depending on the number of such depressions, molds are designated as a<br />
single cavity or multiple cavities.