Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Blend: Made by mixing traditional polymers which have already formed. The mixing results in a<br />
multi-phase system. Physical interactions between the polymers are responsible for the properties<br />
of the blend.<br />
Blister: Undesirable rounded elevation of the surface of a plastic, whose boundaries may be<br />
more or less sharply defined, resembling in shape a blister on the human skin. The blister may<br />
burst and become flattened.<br />
Block: It is the large expanded honeycomb piece before the slices are sawn.<br />
BMC: Bulk Molding Compound (Thermoset).<br />
Bobbin: A cylinder or slightly tapered barrel, with or without flanges, for holding tows, rovings,<br />
or yarns.<br />
Bond: The adhesion of one surface to another, with or without the use of an adhesive as a<br />
bonding agent.<br />
Bond Line: The layer of adhesive that attaches two adherends.<br />
Bond Ply: The ply or fabric patch that comes in contact with the honeycomb core during repair.<br />
Bond Strength: The amount of adhesion between bonded surfaces; a measure of the stress<br />
required to separate a layer of material from the base to which it is bonded. The amount of<br />
adhesion between bonded surfaces.<br />
Boron Fiber: A fiber usually of a tungsten-filament core with elemental boron vapor deposited<br />
on it to impart strength and stiffness.<br />
Braid: A system of three or more yarns which are interwoven in such a way that no two yarns<br />
are twisted around each other.<br />
Braid Angle: The acute angle measured from the axis of braiding.<br />
Braid, Biaxial: Braided fabric with two-yarn systems, one running in the +θ direction, the other<br />
in the -θ direction as measured from the axis of braiding.<br />
Braid Count: The number of braiding yarn crossings per inch measured along the axis of a<br />
braided fabric.<br />
Braid, Diamond: Braided fabric with an over one, under one weave pattern, (1 x 1).<br />
Braid, Flat: A narrow bias woven tape wherein each yarn is continuous and is intertwined with<br />
every other yarn in the system without being intertwined with itself.<br />
Braid, Hercules: A braided fabric with an over three, under three weave pattern, (3 x 3).
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