Definitions /Dictionary/Glossary - nptel

End: A single fiber, strand, roving or yarn being or already incorporated into a product. An end
may be an individual warp yarn or cord in a woven fabric. In referring to aramid and glass fibers,
an end is usually an untwisted bundle of continuous filaments.
End Count: An exact number of ends supplied on a ball or roving.
Engineering Plastics: These materials are made by specific design. These made through the use
of particular monomers and monomer sequences to produce a plastic with desired properties,
possibly for a specific application.
Environment: The aggregate of all conditions (such as contamination, temperature, humidity,
radiation, magnetic and electric fields, shock and vibration) that externally influence the
performance of a component.
Environmental Stress Cracking: The susceptibility of a thermoplastic resin to crack or craze in
the presence of surface-active agents or other environments.
Epoxy: A chemical compound containing a resin with epoxide groups and a hardener, which
forms a durable, solid thermoset material.
Epoxy Equivalent Weight: The number of grams of resin which contain one chemical
equivalent of the epoxy group.
Epoxy Plastics: Plastics based on resins made by the reaction of epoxides or oxiranes with other
materials such as amines, alcohols, phenols, carboxylic acids, acid anhydrides and unsaturated
compounds.
Epoxy Resin: Resins which may be of widely different structures but are characterized by the
presence of the epoxy group. (The epoxy or epoxide group is usually present as glycidyl ether,
glycidyl amine, or as part of an aliphatic ring system. The aromatic type epoxy resins are
normally used in composites.)
Epoxide: A reactive group in which an oxygen atom is joined to each of two carbon atoms,
which are already united in some other way.
Euler-Bernoulli Beam Equation:
The out-of-plane displacement ‘w’ of a beam is governed by the Euler-Bernoulli Beam Equation,