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.
通过分析表明，压应力对裂纹尖端塑性区和疲劳裂纹的扩展有显著的影响。
The analysis shows that the compressive loading has a significant contribution towards the crack tip plasticity and the fatigue crack growth.
较高的疲劳性能与裂纹尖端闭合应力、断口表面粗糙度以及裂纹扩展路径弯折程度有关。
The high fatigue properties were found to be related with higher crack closure stress, rough fracture surface and tortuousity of crack path.
疲劳裂纹扩展阶段裂纹尖端附近为形成于铁素体晶粒内的位错胞及亚晶。
Dislocation cell and sub grain formed in ferrite grain are found at the stage of fatigue crack propagation in the area of crack tip.
疲劳裂纹扩展阶段裂纹尖端附近为形成于铁素体晶粒内的位错胞及亚晶。
Dislocation cell and sub grain formed in ferrite grain are found at the stage of fatigue crack propagation in the area of crack tip.
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