摘要
在传统的认知中,材料在某一应力作用下达到107周次仍然不会断裂,则称材料有无限寿命。但在最新的研究中,在应力循环周次大于107周次时,焊接接头仍会发生断裂,不存在传统意义上的疲劳极限。综述了近年来对于结构钢焊接接头的超高周疲劳性能的研究成果,包括S-N曲线的特征,断口特征与裂纹的萌生机理,超声冲击处理对焊接接头超高周疲劳性能的影响,最后给出了需要进一步的研究方向。
In traditional cognition, the material doesn't break under a stress in 107 cycles, then the material has infinite life. But in latest research, when the stress cycle is bigger than 107 cysles, the welded joint still breaks and there is no traditional fatigue limit. The research results of ultra high cycle fatigue properties of structural steel welded joint in recent years were summarized, including the characteristics of S-N curve, fracture characteristics, crack initiation mechanism, and the effect of ultrasonic impact treatment on ultra high cycle fatigue properties of welded joints. Finally, the direction of further research was given.
引文
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