The high stress concentration effect of notch can accelerate the process of fatigue crack nucleation in the notchspecimen.
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。
2
The relationship of crack growth rate between lateral notchspecimen and plane plate specimen was studied in this paper. A formula for the relationship was established.
主要研究侧槽试样与平板试样裂纹扩展速率之间的关系，并建立了两者关系的效学表达式。
3
Besides, the fatigue damage for both the boiler steam drum and the notchspecimen under varied amplitude low cycles is investigated with the effect of average stress taken into account.