Strain hardening exponent
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The strain hardening exponent (also called strain hardening index), noted as n, is a materials constant which is used in calculations for stress-strain behaviour in work hardening.
In the formula σ = K ε n, σ represents the applied stress on the material, ε is the strain and 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.
[edit] Tabulation
| Material | n | K (MPa) |
|---|---|---|
| Low-carbon steel (annealed) | 0.21 | 600 |
| 4340 steel alloy (annealed) | 0.12 | 2650 |
| 304 stainless steel (annealed) | 0.44 | 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 |
[edit] References
- ^ Callister, Jr., William D (2005), Fundamentals of Materials Science and Engineering (2nd ed.), United States of America: John Wiley & Sons, p. 199, ISBN 9780471470144
[edit] External links
- More complete picture about the strain hardening exponent in the stress-strain curve on www.key-to-steel.com
- A discourse on textbook prices by Kevin P. Siu
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