The **strain hardening exponent** (also called **strain hardening index**), noted as *n*, is a materials constant which is used in calculations for stress-strain behavior in work hardening.

In the formula σ = K ε n,

σ represents the applied stress on the material,

ε is the strain,

K is the strength coefficient.

The value of the strain hardening exponent lies between 0 and 1. A value of 0 means that a material is a perfectly plastic solid, while a value of 1 represents a 100% elastic solid. Most metals have an n value between 0.10 and 0.50.

Read more about Strain Hardening Exponent: Tabulation

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