Fatigue Sn Curves: steel_4140_QT
Fatigue S-N curve data � stress amplitude vs. cycles to failure for various materials, loading types, and surface conditions per ASM Atlas of Fatigue Curves and MMPDS
| material id | cycles | Sut MPa (MPa) | Sut ksi (ksi) | endurance limit MPa (MPa) | endurance limit ksi (ksi) | loading type | stress amplitude MPa (MPa) | stress amplitude ksi (ksi) | stress ratio | surface condition |
|---|---|---|---|---|---|---|---|---|---|---|
| steel_4140_QT | 1,000 | 1,040 | 150.8 | 520 | 75.4 | rotating_bending | 936 | 135.8 | -1 | machined |
| steel_4140_QT | 5,000 | 1,040 | 150.8 | 520 | 75.4 | rotating_bending | 820 | 118.9 | -1 | machined |
| steel_4140_QT | 10,000 | 1,040 | 150.8 | 520 | 75.4 | rotating_bending | 763 | 110.7 | -1 | machined |
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