Definitions /Dictionary/Glossary - nptel

Bulk Molding Compound: Thermosetting resin mixed with strand reinforcement, fillers, etc.
into a viscous compound for compression or injection molding.
Bundle: It is a general term used for a collection of essentially parallel filaments or fibres. It is a
general term for a collection of essentially parallel filaments or fibers.
Burst Strength:
(1) Hydraulic pressure required to burst a vessel of given thickness. It is commonly used in
testing filament-wound composite structures.
(2) Pressure required to break a fabric by expanding a flexible diaphragm or pushing a
smooth spherical surface against a securely held circular area of fabric. The Mullen
expanding diaphragm and Scott ball burst machine are examples of equipment used for
this purpose.
Butt Joint: A joint in which parts are joined with no overlap.
C-Glass: A glass with a soda-lime-borosilicate composition that is used for its chemical
stability in corrosive environment.
C-Scan: The back and forth scanning of a specimen with ultrasonic. A non- destructive testing
technique for finding voids, delamination, defects in fibre distribution.
C-Stage: The final stage of the curing reaction of a thermosetting resin in which the material has
become practically infusable and insoluble (Normally considered fully cured and sometimes
referred to as resite).
CAD/CAM: Computer-aided design/computer-aided manufacturing.
Capstan: A friction type take-up device which moves braided fabric away from the fell. The
speed of which determines the braid angle.
Carbon-Carbon: A composite material consisting of carbon or graphite fibres in a carbon or
graphite matrix.
Carbon Fibers: Fibers produced by the pyrolysis of organic precursor fibers such as rayon,
polyacrylonitrile (PAN), and pitch in an inert atmosphere. The term is often used
interchangeably with "graphite"; however, carbon fibers and graphite fibers differ in the
temperature at which the fibers are made and heat-treated, and the amount of carbon produced.
Carbon fibers typically are carbonized at about 2400°F (1300°C) and assay at 93 to 95% carbon,
while graphite fibers are graphitized at 3450 to 5450°F (1900 to 3000°C) and assay at more than
99% elemental carbon.
Caroxyl: The chemical group characteristic of organic acids, which are incorporated into the
polyester reaction process.