EngiRef / Materials Engineering Formula
Basquin Equation (Fatigue)
Basquin Equation (Fatigue): High-cycle fatigue life prediction. A Fatigue formula in materials engineering. Variables σₐ, σ'f, Nf and b, each with SI and…
Fatigue
Specification
- Name
- Basquin Equation (Fatigue)
- Discipline
- materials
- Category
- Fatigue
- LaTeX
- \sigma_a = \sigma_f^\prime (2N_f)^b
- Description
- High-cycle fatigue life prediction
- Conditions
- Empirical stress-life relation; 2Nf is reversals to failure
- Can solve for
- σₐ, Nf
- Tags
- fatigue, basquin, cycles, life
Variables
| Symbol | Name | Unit | Si Unit | Imperial Unit |
|---|---|---|---|---|
| σₐ | Stress Amplitude | Pa | Pa | psi |
| σ'f | Fatigue Strength Coefficient | Pa | Pa | psi |
| Nf | Cycles to Failure | — | — | — |
| b | Fatigue Strength Exponent | — | — | — |