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netting analysis
Treating composites like fi-
bers without matrix. It is not a mechanical
analysis, and is not applicable to composites.
non-air-inhibited resin
A resin in which the
surface cure will not be inhibited or stopped by
the presence of air. A surfacing agent has been
added to exclude air from the surface of the
resin.
nondestructive evaluation (NDE)
Broadly considered synonymous with nonde-
structive inspection (NDI). More specifically,
the analysis of NDI findings to determine
whether the material will be acceptable for its
function.
nondestructive inspection (NDI)
A pro-
cess or procedure, such as ultrasonic or radio-
graphic inspection, for determining the quality of
characteristics of a material, part or assembly,
without permanently altering the subject or its
properties. Used to find internal anomalies in a
structure without degrading its properties.
nonwoven fabric
A planar textile structure
produced by loosely compressing together fibers,
yarns, rovings, etc. with or without a scrim cloth
carrier. Accomplished by mechanical, chemical,
thermal, or solvent means and combinations
thereof.
non-volatile material
Portion remaining as
solid under specific conditions short of decompo-
sition.
normal stress
The stress component that is
perpendicular to the plane on which the forces
act.
notch sensitivity
The extent to which the sen-
sitivity of a material to fracture is increased by
the presence of a surface nonhomogeneity, such
as a notch, a sudden change in section, a crack
or a scratch. Low notch sensitivity is usually as-
sociated with ductile materials, and high notch
sensitivity is usually associated with brittle mate-
rials.
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