Strain hardening exponent
The strain hardening exponent (also called strain hardening index), noted as n, is a material's 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.
Tabulation
| Material | n | K (MPa) |
|---|---|---|
| Low-carbon steel (annealed) | 0.21 | 600 |
| 4340 steel alloy (tempered @ 315 °C) | 0.12 | 2650 |
| 304 stainless steel (annealed) | 0.43 | 1400 |
| Copper (annealed) | 0.44 | 530 |
| Naval brass (annealed) | 0.21 | 585 |
| 2024 aluminum alloy (heat treated—T3) | 0.17 | 780 |
| AZ-31B magnesium alloy (annealed) | 0.16 | 450 |
References
- ↑ Callister, Jr., William D (2005), Fundamentals of Materials Science and Engineering (2nd ed.), United States of America: John Wiley & Sons, p. 199, ISBN 978-0-471-47014-4
External links
This article is issued from Wikipedia - version of the 11/20/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.