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Glossary
M10-94400-1
Torsional Strain.
Strain corresponding to a specified torque in the torsion
test. It is equal to torsional deformation multiplied by
the radius of the specimen.
Torsional Strength.
Measure of the ability of a material to withstand a twist-
ing load. It is the ultimate strength of a material sub-
jected to torsional loading, and is the maximum
torsional stress that a material sustains before rupture.
Alternate terms are modulus of rupture and shear
strength.
Torsional Stress.
Shear stress developed in a material subjected to a speci-
fied torque in torsion test. It is calculated by the equa-
tion:
Tr
S =
J
where T is torque, r is the distance from the axis of twist
to the outer-most fiber of the specimen, and J is the po-
lar moment of inertia.
True Strain.
Instantaneous % of change in length of specimen in me-
chanical test. It is equal to the natural logarithm of the ra-
tio of length at any instant to original length.
B-36
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