Improvement of Fatigue Strength through Residual Stress Reduction by Controlling the Sequence of Welding Pass.
Improvement of Fatigue Strength through Residual Stress Reduction by Controlling the Sequence of Welding Pass.
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通过控制焊接道次的顺序来减少残余应力，从而提高疲劳强度。
DOI：
10.1299/kikaia.64.2514
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Akira Hashimoto
中科院分区：
文献类型：
--
作者：
M. Mochizuki;M. Zen;T. Hattori;Michihiro Watanabe;Kimiaki Nakakado;Akira Hashimoto
研究了残余应力对多道次角焊接头焊趾疲劳强度的影响。通过控制焊接道次的顺序来改变试件中的残余应力。最后一道焊道在主板上的试件焊趾处的残余应力为80 Mpa，而最后一道焊道在附着体上的试件焊趾处的残余应力为170 Mpa。在高应力幅值下，试件的疲劳强度基本相同，但在低应力幅值下，主板最后一道焊道试件的疲劳强度大于其他试件。这种差异是由于初始残余应力的大小和循环载荷作用下残余应力的松弛造成的。残余应力的影响在修正的Goodman图中表现出来，其中残余应力被视为平均应力。
The effects of residual stress on fatigue strength at a weld toe in multi-pass fillet-welded joints were evaluated. The residual stresses in the specimen were varied by controlling the sequence of welding passes. The residual stress at the weld toe was 80 MPa in the specimen whose last welding pass was on the main plate, but it was 170 MPa in the specimen whose last pass was on the attachment. The fatigue strength of the specimens was nearly the same at high stress amplitude, but the fatigue strength of the specimen whose last welded pass on the main plate was larger than that of the other specimen at low stress amplitude. This difference is due to the magnitude of the initial residual stress and the relaxation of the residual stress under the cyclic loading. The effects of the residual stress were shown in the modified Goodman diagram, in which residual stress is treated as a mean stress.