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The strain hardening exponent , usually denoted n {\displaystyle n} , a constant often used in calculations relating to stress–strain behavior in work hardening. It occurs in the formula known as Hollomon's equation who originally posited it as
σ = K ϵ n {\displaystyle \sigma =K\epsilon ^{n}}
where σ {\displaystyle \sigma } represents the applied true stress on the material, ϵ {\displaystyle \epsilon } is the true strain, and K {\displaystyle K} 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 n {\displaystyle n} -value between 0.10 and 0.50.