Definitions /Dictionary/Glossary - nptel

Interlaminar: Descriptive term pertaining to an object (for example, voids), event (for example,
fracture), or potential field (for example, shear stress) referenced as existing or occurring
between two or more adjacent laminae.
Interlaminar Shear: Shearing force that produces a relative displacement between two laminae
in a laminate along the plane of the interface.
Intumescent: Fire-retardant technology causing an otherwise flammable material to foam,
forming an insulating barrier when exposed to heat.
Irreversible: Not capable of re-dissolving or re-melting. It is a chemical reaction that proceeds
in a single direction and are not capable of reversal (as applied to thermosetting resins).
Isocyanate Plastics: Plastics based on resins made by the reaction or organic isocyanates with
other compounds.
Isophthalic: Polyester resin based on isophthalic acid, generally higher in properties than a
general purpose or orthothatic polyester resin.
Isotropic: Having uniform properties in all directions.
Izod Impact Test: A test for shock loading in which a notched specimen bar is held at one end
and broken by striking, and the energy absorbed is measured.
Jackstrawing: Visual effect of glass fiber turning white in a cured laminate. It may not affect
the strength of a laminate, but could indicate air entrapment or water contamination.
Kevlar: An organic polymer composed of aromatic polyamides having a para-type orientation
(parallel chain extending bonds from each aromatic nucleus).
Knitted Fabric: It is a textile structure produced by interlooping one or more ends of yarn or
comparable material.
Knot: The means of joining strands of two doffs of roving. The knot is generally a reduced triple
loop surgeon's knot, square knot or overhand knot.
Laminate: Primarily means a composite material system made with layers of fiber
reinforcement in a resin. Sometimes used as a general reference for composites, regardless of
how made. Examples of usage: laminate consumption by market, compression-molded laminate.
Land: Portion of a mold which provides the separation or cutoff of the flash from the molded
article; in the screw of an extruder, the bearing surface along the top of the flights; in an
extrusion die, the surface parallel to the flow of material; in a semi-positive or flash mold, the
horizontal bearing surface; in a two-piece mold, a platform build up to the split line.