Bearing Fatigue Life Calculation Report — Calculation Report
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Bearing Fatigue Life Calculation Report
Design Inputs
- Bearing Element Type: Ball Bearing
- Selection Mode: Custom Inputs
- Dynamic Load Capacity (C): 14 kN
- Equivalent Dynamic Load (P): 2.50 kN
- Rotational Speed (n): 1500 RPM
- Target Reliability Ratio: 90%
- Life Exponent (p): 3.0
Calculated Results
| Load Ratio (C/P): |
| Basic Rating Life (L10): |
| Basic Life in Hours (L10h): |
Verification Steps
1. Identify Bearing Profile & Exponent (p):
- •Selected Bearing: 6204.
- •Element Type: Ball Bearing (Point contact).
- •Rating Exponent p = 3.0000.
2. Determine Equivalent Dynamic Load (P):
- •Direct Dynamic Load Input P = 2.50 kN.
3. Calculate basic L10 rating life in Million Revolutions:
- •Formula: L10 = (C / P)^p
- •Inputs: Dynamic Rating C = 14.00 kN, Equivalent Load P = 2.50 kN.
- •Capacity-to-Load Ratio (C / P) = (14.00 / 2.50) = 5.6000.
- •Basic Rating Life (L10) = 5.6000^3.0000 = 175.6160 Million Revolutions.
4. Calculate operating fatigue life in Hours (L10h) at n = 1500 RPM:
- •Formula: L10h = (10⁶ * L10) / (60 * n)
- •L10h = (1,000,000 * 175.6160) / (60 * 1500) = 1951.3 Hours.
Engineering Disclaimer: Calculations are derived per ISO 281 fatigue models. Actual bearing operating life can be affected by lubrication cleanliness, viscosity ratio, housing stiffness, dynamic shock loads, and thermal operating cycles.