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Glossary
where E is modulus of elasticity; l, length of the rod; ρ,
density; f, resonant frequency; k, radius of gyration of
the rod about an axis normal to the rod axis and plane of
motion (d/4 for cylindrical rods); and j, a constant de-
pendent on the mode of vibration. Tensile modulus of
elasticity is approximately equal to compressive modu-
lus of elasticity within the proportional limit.
Tensile Strength.
Ultimate strength of a material subjected to tensile load-
ing. It is the maximum stress developed in a material in
a tension test.
Tension Impact Test.
Method for determining energy required to fracture a
specimen under shock tensile loading (ASTM D-1822).
Tension Set.
Extent to which vulcanized rubber is permanently de-
formed after being stretched a specified amount for a
short time. It is expressed as a % of the original length
or distance between gage marks (ASTM D-412).
Tension Test.
Method for determining behavior of materials under ax-
ial stretch loading. Data from test are used to determine
elastic limit, elongation, modulus of elasticity, propor-
tional limit, reduction in area, tensile strength, yield
point, yield strength and other tensile properties. Tension
tests at elevated temperatures provide creep data.
B-34
2
2
2
ρ f
4π
l
E =
2
4
k
j
M10-94400-1
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