Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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L/D Ratio: A term used to define an extrusion screw, which denotes the ratio of the screw length<br />
to the screw diameter.<br />
Lubricant: A material added to most sizing to improve the handling and processing properties<br />
of textile strands, especially during weaving.<br />
M-Glass: A high beryllia (BeO2) content glass designed especially for high modulus of<br />
elasticity.<br />
Macro: In relation to composites, denotes the gross properties of a composite as a structural<br />
element but does not consider the individual properties or identity of the constituents.<br />
Macro-strain: The mean strain over any finite gage length of measurement which is large in<br />
comparison to the material's inter-atomic distance.<br />
Male Mold: A convex mold where the concave surface of the part is precisely defined by the<br />
mold surface.<br />
Mandrel: A form fixture or male mold used for the base in the production of a part by lay-up,<br />
filament winding or braiding.<br />
Mass: The quantity of matter contained in a specific body. In reference to polyesters, mass is<br />
measured in mils or inches thickness of a film or casting.<br />
Master (Plug): The permanent tool used to build molds for the manufacture of fiberglass parts.<br />
Mat: A fibrous material consisting of randomly oriented chopped or swirled filaments loosely<br />
held together with a binder.<br />
Mat Binder: Resin applied to glass fiber and cured during the manufacture of mat, to hold the<br />
fibers in place and maintain the shape of the mat.<br />
Matched Die Molding: The technique for producing long runs of identical parts with two<br />
finished sides.<br />
Matched Metal Molding: A reinforced plastics manufacturing process in which matching male<br />
and female metal molds are used to form the part, with time, pressure and heat.<br />
Matched Molds: Two or more tools arranged in a set as a male and female mold. Normally<br />
used in a press.<br />
Matched Metal Molding: A reinforced plastics manufacturing process in which matching male<br />
and female metal molds are used ( similar to compression molding) to form the part - as opposed<br />
to low pressure laminating or spray-up.<br />
Material Acceptance: The testing of incoming material to ensure that it meets requirements.