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Glossary
Procedures for tension tests of metals are given in
ASTM E-8. Methods for tension tests of plastics are out-
lined in ASTM D-638, ASTM D-2289 (high strain
rates), and ASTM D-882 (thin sheets). ASTM D-2343
outlines a method for tension testing of glass fibers;
ASTM D-897, adhesives; ASTM D-412, vulcanized rub-
ber.
Time for Rupture.
Time required to rupture specimen under constant stress
and temperature in a creep test.
Torsion Test.
Method for determining behavior of materials subjected
to twisting loads. Data from a torsion test is used to con-
struct a stress-strain diagram and to determine elastic
limit torsional modulus of elasticity, modulus of rupture
in torsion, and torsional strength. Shear properties are
often determined in a torsion test. (ASTM E-143).
Torsional Deformation.
Angular displacement of specimen caused by a specified
torque in torsion test. It is equal to the angular twist (ra-
dians) divided by the gauge length (in.).
Torsional Modulus of Elasticity.
Modulus of elasticity of material subjected to twist load-
ing. It is approximately equal to shear modulus and also
is called modulus of rigidity.
B-35
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