Definitions /Dictionary/Glossary - nptel

Continuous Roving: Parallel filaments coated with sizing, gathered together into single or
multiple strands, and wound into a cylindrical package. It may be used to provide continuous
reinforcement in woven roving, filament winding, pultrusion, prepregs, or high-strength molding
compounds, or it may be used chopped.
Continuous Strand Roving: A bundle of glass filaments which are fed through a chopper gun
in the spray up process.
Copolymer: A large chemical chain composed of two or more dissimilar groups.
Core: The central component of a sandwich construction to which the sandwich faces or skins
are attached; also, part of a complex mold that forms undercut parts.
Core Angle: The angle between the plane of the core slice and the cell wall. In normal cases it
should be 90°.
Core Crush: Compression damage of the core.
Core Density: It is the weight of one cubic foot of core, expressed in pounds per cubic foot
(pcf).
Core Depression: A gouge or indentation in the core material.
Core Failure: It is the sandwich panel failure caused by the core failing in compression, shear or
tension.
Core-to-facing Bond: The connection of the facings to the core by an adhesive, resin, brazing,
etc.
Core Orientation: Used on a honeycomb core to line up the ribbon direction, thickness of the
cell depth, cell size and transverse direction.
Core Separation: A partial or complete breaking of the core node bond.
Core Splicing: Joining two core segments by bonding them together.
Cored Mold: It is a mold incorporating passages for electrical heating elements, steam or water.
Count: For fabric, number of warp and filling yarns per inch in woven cloth. The sine of the
yarn based on relation of length and weight.
Coupling Agent: Any chemical substance designed to react with both the reinforcement and
matrix phases of a composite material to form or promote a stronger bond at the interface.
Coupling agents are applied to the reinforcement phase from an aqueous or organic solution or
from a gas phase, or added to the matrix as an integral blend.