Improving Fatigue Strength of Butt Welded Joints by Laser Peening and Its Main Factor
Improving Fatigue Strength of Butt Welded Joints by Laser Peening and Its Main Factor
复制标题
激光喷丸提高对接焊缝疲劳强度及其主要因素
DOI：
10.2207/qjjws.29.146
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
You
中科院分区：
文献类型：
--
作者：
Y. Sakino;Y. Sano;R. Sumiya;You
激光喷丸是在焊接构件表面引入残余压应力的一种有效方法，焊后残余拉应力是降低疲劳寿命的重要因素之一。结构用钢广泛用于桥梁、建筑物等，然而，激光喷丸对结构钢的影响还没有很好地确定。在这项研究中，残余应力，维氏硬度和疲劳强度的对接焊接接头的趾激光喷丸预处理，并与未经激光喷丸处理的进行了比较。进一步将这些结果与退火试样的结果进行比较，以阐明提高疲劳强度的主要因素。主要结果总结如下。1)激光喷丸在对接接头趾部产生了较大的残余压应力。2)维氏硬度也增加了激光喷丸，但增量水平很小。3)经激光喷丸处理后，焊接接头的107周疲劳强度明显提高。4)可以认为，提高疲劳强度的主要因素是残余压应力的产生。
Laser peening which introduces compressive residual stress on surface is effective in extending fatigue lives of welded components, because tensile residual stress after welding is one of the most important factors reducing the fatigue lives. Steels for structures are widely used for bridges, buildings, etc., however the effects of laser peening on steels for structures are not well established. In this study, the residual stress, Vickers hardness and fatigue strength of the toe of butt welded joints pretreated by laser peening were examined and compared to those without laser peening. These results were further compared to those of annealed specimens in order to clarify the main factor of improving the fatigue strength. Main results are summarized as follows. 1) Large and deep compressive residual stress was generated around the toe of the butt welded joints by laser peening. 2) Vickers hardness also increased by laser peening but the incremental level was small. 3) Fatigue strength at 107 cycles of the butt welded joints became much higher by laser peening. 4) It can be considered that the main factor of improving fatigue strength is the generation of compressive residual stress.
通过脱气处理铸造铝合金的喷丸处理提高疲劳强度
DOI：
--
发表时间：
2006
期刊：
International Journal of Modern Physics B 20・25,26,27
影响因子：
--
作者：
Y.Ochi;K.Masaki;T.Matsumura;Y.Kumagai;T.Hamaguchi;Y.Sano
通讯作者：
Y.Sano
DOI：
10.1016/j.msea.2005.11.017
发表时间：
2006-02-15
影响因子：
6.4
作者：
Sano, Y;Obata, M;Ochi, Y
通讯作者：
Ochi, Y