Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Braid/Braider: A narrow tubular or flat fabric produced by intertwining a single set of yarns<br />
according to a definite pattern.<br />
Breakup: see Dispersion<br />
Breathing: Opening and closing a mold so that gas can escape early in the molding cycle. Also<br />
called "degassing"; sometimes called "bumping" in Phenolic molding.<br />
Bridging: It is the condition in which fibers do not move into or conform to radii and corners<br />
during molding, resulting in voids and dimensional control problems.<br />
Broad Strand: see Wides or Matchsticks<br />
Broken Strand: see Broken End<br />
Broken End: In the roving operation, a severed strand (bundle), this causes the forming cake to<br />
stop running.<br />
Broken Fibers: see Fuzz<br />
B-Stage: Intermediate stage in the reaction of certain thermosetting resins in which the material<br />
softens when heated, is plastic and is fusible but may not entirely dissolve or fuse. It is also<br />
called "resistol" or "resitol." Resin in an uncured prepreg or premix is usually in this stage.<br />
Buckling (Composite): It is a failure mode generally characterized by an unstable lateral<br />
material deflection due to compressive action on the structural element involved.<br />
Buildup: Glass bundles or chopper fuzz that collect on the chopper, cot, static bars or machine<br />
frame.<br />
Bulk Molding Composite (BMC): Thermosetting resin mixed with short strand reinforcement,<br />
filler, and other materials to form a viscous compound for compression or injection molding.<br />
Bundle: A discrete collection of many parallel glass filaments. It is a collection of individual<br />
filaments; a sub-strand.<br />
Burst Strength:<br />
• Hydraulic pressure required to burst a vessel of given thickness. It is commonly used in<br />
testing filament-wound composite structures.<br />
• Pressure required to break a fabric by expanding a flexible diaphragm or pushing a<br />
smooth spherical surface against a securely held circular area of fabric. The Mullen<br />
expanding diaphragm and Scott ball burst machine are examples of equipment used for<br />
this purpose.<br />
Bushing: Plate with holes through which molten glass is pulled to produce glass fibers.