分析了冷扩张对疲劳裂纹尖端应力强度因子分布的影响。
The influence of cold expansion on the stress intensity factor distribution in crack tip was also analyzed.
通过开疲劳裂纹和线切割裂纹的对比试验，研究裂纹尖端的尖锐程度对球墨铸铁断裂韧性的影响；
By comparing fatigue crack with electrosparking crack, the effects of crack tip on fracture toughness of ductile iron have been studied.
采用SEM对缺口试样疲劳裂纹形成与扩展特征进行了初步分析，发现裂纹最先在缺口尖端表面形成。
The initiation and propagation of fatigue cracks at the notch roots were also observed by using SEM method. It was indicated that the crack firstly initiated from the surface of notch tip.
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