An enhancement of the current design concepts for the improved consideration of residual stresses in fatigue-loaded welds
An enhancement of the current design concepts for the improved consideration of residual stresses in fatigue-loaded welds
复制标题
增强当前设计概念，更好地考虑疲劳载荷焊缝中的残余应力
DOI：
10.1007/s40194-021-01065-8
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发表时间：
2021
影响因子：
2.1
通讯作者：
J. Hensel
中科院分区：
文献类型：
--
作者：
T. Nitschke–Pagel;J. Hensel
疲劳载荷焊接中的残余应力的考虑目前只是定性地进行，而没有关于其真实的分布、量和前缀的可靠知识。因此，在设计概念中能够或多或少考虑不安全因素的工具主要是基于不安全的经验和可疑的假设。由于使用明确确定的残余应力外的焊接社区是最先进的，本文的目标是显示一个切实可行的方法，在当前的设计工具中的残余应力的增强考虑。这不仅限于焊接引起的残余应力，而且还限于焊后处理工艺，如HFMI或喷丸。低强度钢和高强度钢的纵向角焊缝和对接焊缝的扩展实验结果明显表明，在疲劳强度近似中改进使用残余应力能够更好地评估喷丸工艺以及材料调整焊接工艺或焊后应力消除处理。这一概念表明，克服现有的极其保守但不安全的规则和条例通常是可能的，并且还可以改进高强度钢的使用。
The consideration of residual stresses in fatigue-loaded welds is currently done only qualitatively without reliable knowledge about their real distribution, amount and prefix. Therefore, the tools which enable a more or less unsafe consideration in design concepts are mainly based on unsafe experiences and doubtful assumptions. Since the use of explicitly determined residual stresses outside the welding community is state of the art, the target of the presented paper is to show a practicable way for an enhanced consideration of residual stresses in the current design tools. This is not only limited on residual stresses induced by welding, but also on post-weld treatment processes like HFMI or shot peening. Results of extended experiments with longitudinal fillet welds and butt welds of low and high strength steels evidently show that an improved use of residual stresses in fatigue strength approximation enables a better evaluation of peening processes as well as of material adjusted welding procedures or post-weld stress relief treatments. The concept shows that it is generally possible to overcome the existing extremely conservative but although unsafe rules and regulations and may also enable the improved use of high strength steels.