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Glossary
M10-94400-1
Splitting Resistance.
Measure of the ability of felt to withstand tearing. It is
the load required to rupture a slit felt specimen by grip-
ping lips of the cut in jaws and pulling them apart
(ASTM D-461). An alternate term is tear resistance.
Springback.
Degree to which a material returns to its original shape
after deformation. In plastics and elastomers, it is also
called recovery.
Stiffness.
Measure of resistance of plastics to bending. It includes
both plastic and elastic behavior, so it is an apparent
value of elastic modulus rather than a true value (ASTM
D-747).
Strain.
Change per unit length in a linear dimension of a part or
specimen, usually expressed in % Strain, as used with
most mechanical tests, is based on original length of the
specimen.
True or natural strain is based on instantaneous length, and
is equal to:
l
ln ⋅
,
l
o
where l is the instantaneous length and l
is the original
0
length of the specimen. Shear strain is the change in an-
gle between two lines originally at right angles.
B-28
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