Definitions /Dictionary/Glossary - nptel

Intra-laminar: Within the laminae of a laminate.
Discussion: describing objects (for example, voids), event (for example, fracture), or
fields (for example, stress).
Intra-ply Hybrid: A composite in which different materials are used within a specific layer or
band.
Intumescent: A fire-retardant technology which causes an otherwise flammable material to
foam, forming an insulating barrier when exposed to heat.
In-Situ: In the position which it will finally occupy, e.g. molding or forming foam.
Irreversible: Chemical reactions that proceed in a single direction and are not capable of
reversal (As applied to thermosetting resins).
Isocyanate Plastics: Plastics based on resins made by the condensation of organic isocyanates
with other compounds.
ISO: Abbreviated terminology for the isophthalic acid type resins and gel coats.
Isotropic -- Having uniform properties in all directions. The measured properties of an isotropic
material are independent of the axis of testing.
Isophthalic: A polyester resin based on isophthalic acid, generally higher in properties that a
general purpose or orthothatic polyester resin.
Izod Impact Test: A destructive test designed to determine the resistance of a plastic to the
impact of a suddenly applied force.
Jackstrawing: Prominence of fiberglass pattern having turned white in the Laminants
because the glass has separated from the resin due to excessive exothermic heat usually
associated with thick, resin rich Laminants.
Jig: Any fixture for holding parts in position, while joining them together or to maintain their
shape.
Joint: A line or distinction formed when two panels are connected. It is also referred to as a
seam.
Jammed State: It is the state of a braided fabric under tension or compression where the
deformation of the fabric is dominated by the deformation properties of the yarn.
Kerf: The width of a cut made by a saw blade, torch, water jet, laser beam, etc.
Kevlar: Trademark of DuPont for aramid fibers used as a reinforcement fiber.