The strain hardening exponent (also called the strain hardening index), usually denoted
, a constant often used in calculations relating to
stress–strain behavior in
work hardening. It occurs in the formula known as Hollomon's equation (after
John Herbert Hollomon Jr.
John Herbert Hollomon Jr. (March 12, 1919 – May 8, 1985) was a noted American engineer and founding member of the National Academy of Engineering.
Biography
Hollomon was born in Norfolk, Virginia, and in 1946 received his D.Sc. from the Mas ...
) who originally posited it as
[J. H. Hollomon, Tensile deformation, Trans. AIME, vol. 162, (1945), pp. 268-290.]
where
represents the applied
true stress
True most commonly refers to truth, the state of being in congruence with fact or reality.
True may also refer to:
Places
* True, West Virginia, an unincorporated community in the United States
* True, Wisconsin, a town in the United States
* Tr ...
on the material,
is the
true strain, and
is the strength coefficient.
The value of the strain hardening exponent lies between 0 and 1, with a value of 0 implying a perfectly
plastic solid and a value of 1 representing a perfectly
elastic solid. Most metals have an
-value between 0.10 and 0.50.
Tabulation
References
External links
More complete picture about the strain hardening exponent in the stress–strain curve on ''www.key-to-steel.com''
Mechanical engineering
Solid mechanics
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