Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Heat-Convertible Resin: A thermosetting resin convertible by heat to an infusible and insoluble<br />
mass.<br />
Heat-Distortion Temperature: Temperature at which a test bar deflects a certain amount under<br />
specified temperature and a sated load.<br />
Heat Resistance: The property or ability of plastics and Elastomer to resist the deteriorating<br />
effects of elevated temperatures.<br />
Heat-Pressure Laminants: Laminants molded and cured at pressures not lower than 1000 psi.<br />
Heat Sink: A device for the absorption or transfer of heat away from a critical element or part.<br />
Helical Winding: In filament winding, a winding in which a filament band advances along a<br />
helical path.<br />
Helical: Ply lay onto a mandrel at an angle, often a 45-degree angle.<br />
Het-Acid Resin: Polyester resin with exceptional fire qualities.<br />
Heterogeneous: Descriptive term for a material consisting of dissimilar constituents separately<br />
identifiable; a medium consisting of regions of unlike properties separated by internal<br />
boundaries. (Note that all non-homogeneous materials are not necessarily heterogeneous).<br />
High Pressure Laminate: -Laminate molded and cured at pressures not lower than 6.9 MPa<br />
(1000 psi) and in the range of 6.9-14 MPa (1000-2000 psi).<br />
High Pressure Molding: A molding process wherein pressure is in excess of 6.9 MPa (1000<br />
psi).<br />
HOBE: Honeycomb before Expansion, the solid block of bonded sheets.<br />
Homogeneous: Descriptive term for a material of uniform composition throughout; a medium<br />
which has no internal physical boundaries; a material whose properties are constant at every<br />
point, in other words, constant with respect to spatial coordinates (but not necessarily with<br />
respect to directional coordinates).<br />
Honeycomb: Resin-impregnated material manufactured in, usually, hexagonal cells that serve as<br />
a core material in sandwich constructions. Honeycomb may also be metallic or polymer<br />
materials in a rigid, open structure.<br />
Honeycomb Core: Strips of paper, plastic metal, etc., joined together to form a honeycomb<br />
pattern. Used as a lightweight core in sandwich moldings.<br />
Hoop: Ply lay onto a mandrel at a 90-degree angle.