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ultimate tensile strength
The ultimate or fi-
nal (highest) stress sustained by a specimen in a
tension test. Rupture and ultimate stress may or
may not be the same.
ultrasonic testing
A nondestructive test ap-
plied to materials for the purpose of locating in-
ternal flaws or structural discontinuities by the
use of high-frequency reflection or attenuation
(ultrasonic beam).
uniaxial load
A condition whereby a material
is stressed in only one direction along the axis or
centerline of component parts.
unidirectional fibers
Fiber reinforcement ar-
ranged primarily in one direction to achieve
maximum strength in that direction.
urethane plastics
Plastics based on resins
made by condensation of organic isocyanates
with compounds or resins that contain hydroxyl
groups. The resin is furnished as two component
liquid monomers or prepolymers that are mixed
in the field immediately before application. A
great variety of materials are available, depend-
ing upon the monomers used in the prepolymers,
polyols, and the type of diisocyanate employed.
Extremely abrasion and impact resistant. See
also polyurethane.
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