Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Doubler: Localized area of extra layer reinforcement, usually to provide stiffness or strength for<br />
fastening or other abrupt load transfers.<br />
Draft: The tape or slope of the vertical surfaces of a mold designed to facilitate removal of<br />
molded parts.<br />
Draft Angle: A mandrel's taper or angle for ease of part removal.<br />
Drain Out: The leaking, sagging and puddling of the laminating resin from the laminate.<br />
Drape: The ability of pre impregnated broad goods to conform to an irregular shape; textile<br />
conformity.<br />
Drawn Fibre: It is fibre with a certain amount of orientation imparted by the drawing process by<br />
which it was formed.<br />
Drilled Core: Honeycomb that has holes drilled in the cell walls to allow gases or fluids to<br />
escape from the cells.<br />
Dry: A material condition of moisture equilibrium with a surrounding environment at 5% or<br />
lower relative humidity.<br />
Dry Spot: Area of incomplete surface film on laminated plastics; in laminated glass, an area<br />
over which the interlayer and the glass have not become bonded.<br />
Dry Chop: Chopping a roving without the simultaneous admixture of resin and catalyst.<br />
Dry Fiber Area: Area of fiber not totally encapsulated by resin.<br />
Dry Laminate: The laminate containing insufficient resin.<br />
Dry Lay-up: Construction of a laminate by the layering of pre-impregnating reinforcement in a<br />
female mold or on a male mold usually followed by bag molding or autoclave molding.<br />
Dry Winding: A type of filament winding in which pre-impregnated roving is used.<br />
Ductility: The ability of a material to deform plastically before fracturing.<br />
Duplication Mold: A mold made by casting over or duplicating another article.<br />
Durometer of Hardness: The hardness of a material determined by Shore durometer.<br />
Dwell Point: A lightning attachment point.<br />
Dwell Time: The time that the lightning channel remains attached to a single spot Ion the<br />
aircraft.