Fatigue Crack Initiation Point in Load Carrying Fillet Welded Cruciform Joints.
Fatigue Crack Initiation Point in Load Carrying Fillet Welded Cruciform Joints.
复制标题
承载角焊十字形接头中的疲劳裂纹起始点。
DOI：
10.2207/qjjws.17.94
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Mitsuru Ichimiya
中科院分区：
文献类型：
--
作者：
T. Mori;Mitsuru Ichimiya
承载角焊十字接头有两个疲劳裂纹萌生点。它们是发生高应力集中的焊趾和焊根。两者中的哪一个是起始点取决于焊缝尺寸、板厚和焊缝熔深，并且该机制可以容易地理解。一些实验结果表明，疲劳裂纹起源点还受到应力范围大小的影响。然而，这种现象的原因尚不清楚。本文通过对焊接接头试样的疲劳试验、焊接残余应力的热弹塑性有限元分析和消除残余应力的疲劳裂纹扩展分析，查明了其原因。
Load carrying fillet welded cruciform joints have two fatigue crack initiating points. They are weld toes and weld roots at which high stress concentrations occur. Which of the two is to be the initiating point depends on weld size, plate thickness and weld penetration, and this mechanism can be easily understood. Some experimental results indicated that fatigue crack originating point was also influenced by the magnitude of stress range. The reason for this phenomenon, however, is not clear yet. In this study, in order to make clear the reason, fatigue tests on the welded joint specimens, analyses of welding residual stresses with the aid of the thermo-elastic-plastic finite element method and fatigue crack propagation analyses in considera-tion of the residual stresses are carried out.