The Cross-Scale Life Prediction for the High-Speed Train Gearbox Shell Based on the Three-Interval Method

Table 8

The number of permitted cycles of sample structure under 3sigma equivalent stress.

	Equivalent stress S (MPa)	The number of permitted cycles N
1sigma	85.7	9.204 × 10^6
2sigma	124	1.167 × 10^6
3sigma	269	1.539 × 10^4