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Glossary
quired to propagate a pre-cut slit across a sheet speci-
men; and ASTM D-1038 gives a method for determin-
ing tear propagation resistance that is recommended for
specification acceptance testing only.
Tear resistance of rubber is the force required to tear a 1-
inch thick specimen under the conditions outlined in
ASTM D-624. Tear resistance of textiles is the force re-
quired to propagate a single-rip tongue-type tear (start-
ing from a cut) by means of a falling pendulum
apparatus (ASTM D-1424).
Tearing Strength.
Tensile force required to rupture a pre-slit woven fabric
specimen under the conditions outlined in ASTM D-
2261 and ASTM D-2262. Edge tearing strength of paper
is the force required to tear a specimen folded over a V-
notch and loaded in a tensile test machine.
Tenacity.
Force required to break a yarn or filament, expressed in
grams per denier. It is equal to breaking strength divided
by denier.
Tensile Modulus of Elasticity.
Tangent or secant modulus of elasticity of a material sub-
jected to tensile loading. Alternate terms are Young's
modulus and modulus of elasticity in tension. It can be
measured in a tension test or in a dynamic test where it
is related to resonant frequency on a cylindrical rod by
the equation:
B-33
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