Cum se calculează Fatigue Life
Ce este Fatigue Life?
Fatigue life estimation predicts component life under cyclic loading. Failure occurs at stress levels well below static strength.
Ghid pas cu pas
- 1Use S-N curves or Miner's rule for fatigue analysis
- 2Calculate stress range and mean stress effects
- 3Account for surface finish, size, and stress concentration
Exemple rezolvate
Intrare
Stress range 200 MPa, material steel, 10⁶ cycle life, actual 5×10⁸ cycles required
Rezultat
Life exceeded; fatigue safe
Approximate S-N curve lookup
Greșeli frecvente de evitat
- ✕Using static stress limits for cyclic loading
- ✕Neglecting size effect on fatigue strength
Întrebări frecvente
What is endurance limit?
Maximum stress below which infinite life is achieved (for steel ~0.5 × ultimate strength).
How do stress concentrations affect fatigue?
Stress concentrations reduce fatigue strength significantly; notches and holes are critical.
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