Crane Designer's Fatigue Design
(4/8)
Description
Purpose of calculation:
Determine fatigue strength of mechanical component.
Calculation Reference
BS2573: Pt 2 Appendix C
ISO 4301/1
Calculation Procedure
Ultimate strength of material (max 1100MPa)
Applied stress
Diameter
Stress state factor
Size factor
Surface finish factor (approximate values using linear curve fit to tabulated data).
- As Forged
- Hot Rolled
- Rough turned (peak to valley height 30μm)
- Turned/rough ground (peak to valley height 12μm)
- Fine turned (peak to valley height 6.5μm)
- Fine ground (peak to valley height 2.5μm)
- Lapped/rough polished (peak to valley height 1μm)
- Mirror polished
Stress concentration factor
Notch sensitivity factor
Fatigue notch factor
Fatigue limit factor
Fatigue reference stress factor
Fatigue reference stress (90% probability of survival)
Design Stress
Demand to capacity ratio
Allowable Stress Amplitude
Demand to capacity ratio
Calculate σall for given N using power trend line (fit equation: y=cxb)
Generate SN Diagram
Generate Goodman Diagram
Calculation Reference
Petersons Stress Concentration Factors
Machinery's Handbook 18th ed.
Crane Design
BS2573
ISO 4301
Calculation Preview
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