Fatigue crack growth rate da/dN = C·(ΔK)^m. Integrates the life from initial to critical crack size.
Formula
$$ \frac{da}{dN} = C \cdot (\Delta K)^m $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $C$ | Paris regression constant | - | material/environment |
| $m$ | Paris exponent | - | material |
| $ΔK$ | Stress-intensity range | MPa·√m | stress analysis |
Sources
- Paris & Erdogan (1963) - Crack propagation.