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Elastic Limit.
Greatest stress that can be applied to a material without
causing permanent deformation. For metals and other
materials that have a significant straight line portion in
their stress/strain diagram, elastic limit is approximately
equal to proportional limit. For materials that do not ex-
hibit a significant proportional limit, elastic limit is an ar-
bitrary approximation (the apparent elastic limit).
Elastic Limit, Apparent.
Arbitrary approximation of the elastic limit of materials
that do not have a significant straight line portion on a
stress/strain diagram. It is equal to the stress at which
the rate of strain is 50% greater than at zero stress. It is
the stress at the point of tangency between the stress-
strain curve and the line having a slope, with respect to
the stress axis, 50% greater than the slope of the curve at
the origin.
Apparent
Elastic
Limit
a
a/2
STRAIN
Glossary
B-11
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