Fatigue behavior of load-carrying fillet welded cruciform joints with plates of different thickness
Fatigue behavior of load-carrying fillet welded cruciform joints with plates of different thickness
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不同厚度板承重角焊十字接头的疲劳性能
DOI：
10.2207/qjjws.22.557
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
In
中科院分区：
文献类型：
--
作者：
S. Kainuma;Y. Kusumoto;N. Hosomi;In
在焊接钢结构中，承载角焊缝接头广泛用于连接结构构件。在钢桥次构件等焊接接头处观察到典型的疲劳裂纹。本研究的目的是阐明板厚差异对承载角焊十字形接头疲劳性能的影响。对不同板厚的节点进行了疲劳试验。主板的厚度为9，14或25毫米和交叉板的厚度为6或14毫米。疲劳裂纹扩展和强度分析，使用断裂力学也进行了各种板厚的接头。试验结果表明，无论主板和跨板厚度如何，疲劳裂纹几乎沿着未焊透焊缝的延长线萌生和扩展。试验和分析结果表明，当十字板厚度小于主板厚度时，各主板厚度差越大，疲劳强度越低。
Load-carrying fillet welded joints in welded steel structures are extensively used for connecting the structural members. Typical fatigue cracks have been observed at the welded joints such as secondary structural members of steel bridges. The object of this research is to clarify the influence of the difference in plate thickness on the fatigue behavior of load-carrying fillet welded cruciform joints. Fatigue tests were carried out on the joints with plate of different thickness. The main plate thickness was 9, 14 or 25 mm and the cross plate thickness was 6 or 14 mm. Fatigue crack propagation and strength analyses using fracture mechanics were also performed on the joints with various plate thickness. The tested specimens indicates that the fatigue cracks are initiated and propagated almost along extended line of non-penetration weld line regardless of the main plate and the cross plate thickness. The experimental and the analytical results show that the larger the difference of thickness in each main plate is, the lower the fatigue strength is, when the cross plate thickness is smaller than that of the main plate.