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
In materials science, work hardening, also known as strain hardening, is the strengthening of a metal or polymer by plastic deformation. Work hardening may be desirable, undesirable, or inconsequential, depending on the context.
This strengt ...
. It occurs in the formula known as Hollomon's equation (after
John Herbert Hollomon Jr.) who originally posited it as
[J. H. Hollomon, Tensile deformation, Trans. AIME, vol. 162, (1945), pp. 268-290.]
where
represents the applied
true stress on the material,
is the
true strain
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 ...
, 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
Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...
solid and a value of 1 representing a perfectly
elastic
Elastic is a word often used to describe or identify certain types of elastomer, elastic used in garments or stretchable fabrics.
Elastic may also refer to:
Alternative name
* Rubber band, ring-shaped band of rubber used to hold objects togeth ...
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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