Effects of Residual Stresses on the Fatigue Performance of Welded Steels with Longitudinal Stiffeners
Effects of Residual Stresses on the Fatigue Performance of Welded Steels with Longitudinal Stiffeners
复制标题
残余应力对纵向加强筋焊接钢疲劳性能的影响
DOI：
10.4028/www.scientific.net/msf.768-769.636
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Schönborn
中科院分区：
文献类型：
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作者：
J. Hensel;T. Nitschke–Pagel;K. Dilger;S. Schönborn
残余应力可能会影响焊接钢在疲劳载荷下的行为。然而，对于焊接结构的设计，焊接残余应力的高度和分布往往是未知的，因此，在屈服强度的顺序拉伸残余应力是保守地假设。研究了残余应力对低碳钢S355 NL和高强度钢S960 QL纵向加劲肋疲劳强度的影响。利用X射线和中子衍射测量了初始残余应力状态。为了表征残余应力对疲劳强度的影响，在焊接状态下和应力消除热处理后对试样进行了测试。在应力比R=-1的交变恒幅载荷下进行疲劳试验。
Residual stresses may affect the behavior of welded steels under fatigue loading. However, for design of welded structures the height and distribution of residual stresses from welding are often not known so that tensile residual stresses in the order of the yield strength are conservatively assumed. Here presented results focus on the influence of residual stresses on the fatigue strength of longitudinal stiffeners made from a mild steel S355NL and a high strength steel S960QL. The initial residual stress conditions were measured using X-ray and neutron diffraction. In order to characterize the influence of residual stresses on the fatigue strength, specimens were tested in the as-welded condition and after a stress relieving heat treatment. The fatigue testing was conducted under alternating constant amplitude loading with a stress ratio of R=-1.