The high stress concentration effect of notch can accelerate the process of fatigue crack nucleation in the notch specimen.
缺口试样在缺口的高应力集中效应下，加快疲劳裂纹形核过程。
Then the effect of Stress Concentration and the Stress Gradient were introduced into the prediction of fatigue life through Correction Coefficient of Stress with the wider suitable life scope.
通过应力修正系数对危险点最大应力进行修正，将应力集中和应力梯度效应引入到寿命的估算中，因而扩大了传统的应力寿命法可适用的寿命范围。
The results show the stress concentration caused by acute angle effect and the high temperature are the primary cause of producing crack.
结果表明，尖角效应引起的应力集中和热处理淬火加热温度偏高是导轨端面产生裂纹的主要原因。
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