The numerical analysis of the notch stress field and the experimentalresults both confirm that the growth rate of fatigue surface cracks canbed escrobe by the well--known paris relationship. The estimated valueof rail life agrees with the real life.

• 缺口应力场的数值分析和疲劳裂纹扩展实验均证实表面裂纹扩展速率可用帕里斯(Paris)公式描述,其估算的寿命值和实际值相吻合。