Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Hoop Stress: It is a circumferential stress in a cylindrically shaped part as a result of internal or<br />
external pressure.<br />
Horizontal Shear: Sometimes used to indicate inter-laminar shear. This is not an approved term<br />
for use in this handbook.<br />
Hot Bond Repair: Repair made on a hot-patch bonding machine to cure and monitor curing.<br />
Typically includes heat and vacuum source.<br />
Hot Bond Repair: Repair made on a hot patch bonding machine to cure and monitor curing.<br />
Typically includes heat and vacuum source.<br />
Hot Melt Adhesive: An adhesive that is applied in a molten state and forms a bond after cooling<br />
to a solid state.<br />
Hot Pot: Catalyst is mixed with the gel coat or resin in the material container prior to spraying,<br />
as opposed to internal or external gun mixing.<br />
Hot Setting Adhesive: An adhesive that requires a temperature at or above 100°C (212°F) to<br />
set.<br />
Hot Working Any form of mechanical deformation process carried out on a metal or alloy<br />
above its re-crystallization temperature but below its melting point.<br />
Humidity: Moisture content of the air.<br />
Humidity, Relative: The ratio of the pressure of water vapor present to the pressure of saturated<br />
water vapor at the same temperature.<br />
Hybrid: A composite laminate comprised of laminae of two or more composite material<br />
systems. Or, a combination of two or more different fibers such as carbon and glass or carbon<br />
and aramid into a structure (tapes, fabrics and other forms may be combined).<br />
Hybrid Composite: A composite with two or more types of reinforcing fibers.<br />
Hybrid Resin: What we call a modified resin. For example, we sometimes add a rubber<br />
modifier to an epoxy resin in order to achieve cured properties with a higher impact resistance.<br />
Hydraulic Press: A press in which the molding force is created by the pressure exerted on a<br />
fluid.<br />
Hydro-mechanical Pressure: A press in which the molding forces are created partly by the<br />
mechanical system and partly by the hydraulic system<br />
Hydrophilic: Capable of absorbing water.