Engineering model for the quantitative consideration of residual stresses in fatigue design of welded components
Engineering model for the quantitative consideration of residual stresses in fatigue design of welded components
复制标题
焊接部件疲劳设计中残余应力定量考虑的工程模型
DOI：
10.1007/s40194-017-0467-4
复制
发表时间：
2017
影响因子：
2.1
通讯作者：
K. Dilger
中科院分区：
文献类型：
--
作者：
J. Hensel;T. Nitschke–Pagel;K. Dilger
残余应力是影响焊接构件疲劳强度的主要因素之一。然而，目前IIW的平均应力修正的奖金系数的概念是有限的残余应力的影响的定性评价。通过结合残余应力测量和疲劳试验，作者得出了一个改进的奖金因素的概念，考虑残余应力定量。所提出的概念考虑了载荷平均应力和循环稳定残余应力的综合影响。指出屈服强度不能作为衡量残余应力对焊接钢疲劳强度影响是“低”还是“高”的有效尺度。建议根据反映局部加载条件的有效应力比来评估残余应力效应。
Residual stresses are one of the major factors influencing the fatigue strength of welded components. However, the current IIW bonus factor concept for the mean stress correction is limited to a qualitative evaluation of residual stress effects. By combining residual stress measurements and fatigue testing, the authors derive an improved bonus factor concept that considers residual stresses quantitatively. The proposed concept considers the combined effect of load mean stresses and cyclically stabilized residual stresses. It is pointed out that the yield strength is not a capable measure to determine whether residual stresses have “low” or “extreme” impact on the fatigue strength of welded steels. It is rather recommended to evaluate residual stress effects based on the effective stress ratio reflecting local loading conditions.