Fatigue Life ની ગણતરી કેવી રીતે કરવી
Fatigue Life શું છે?
Fatigue life estimation predicts component life under cyclic loading. Failure occurs at stress levels well below static strength.
પગલું દ્વારા પગલું માર્ગદર્શિકા
- 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
Worked Examples
ઇનપુટ
Stress range 200 MPa, material steel, 10⁶ cycle life, actual 5×10⁸ cycles required
પરિણામ
Life exceeded; fatigue safe
Approximate S-N curve lookup
Common Mistakes to Avoid
- ✕Using static stress limits for cyclic loading
- ✕Neglecting size effect on fatigue strength
Frequently Asked Questions
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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