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首页> 外文期刊>Engineering Structures >Fatigue strength of welded and high frequency mechanical impact (HFMI) post-treated steel joints under constant and variable amplitude loading
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Fatigue strength of welded and high frequency mechanical impact (HFMI) post-treated steel joints under constant and variable amplitude loading

机译：恒定和可变振幅载荷下的焊接和高频机械冲击（HFMI）后处理钢接头的疲劳强度

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摘要

This study presents fatigue test results of longitudinal stiffener specimens in as-welded and high frequency mechanical impact (HFMI) post-treated condition under both constant amplitude loading (CAL) and variable amplitude loading (VAL). The experiments incorporate mild steel S355 and high-strength steel 5700 samples at load stress ratios of R = 0.1 and R = -1 respectively. VAL tests are performed utilizing a straight-line distribution with a sequence length of 2.10(5) load-cycles and an omission level of 19% of the maximum stress range. The test results reveal a significant benefit of the HFMI-treatment under CAL. On the contrary, the increase in fatigue strength is majorly reduced in case of VAL. X-ray residual stress measurements for the investigated mild steel S355 specimens demonstrate that even at comparably minor load stress ranges, a certain relaxation of the HFMI-treatment induced local compressive residual stress state at the weld toe occurs. This phenomenon contributes to the decrease of the benefit by the HFMI-treatment under VAL compared to CAL. An evaluation of specified damage sums on the basis of the determination of an equivalent stress range for VAL reveals that damage sums between D = 1.0 and D = 0.5 are well applicable for a conservative fatigue assessment on the basis of the IIW-recommended fatigue design curves. However, facilitating a lightweight component design by considering experimental test results of HFMI-treated joints under CAL, a reduced specified damage sum of D = 0.3, or even of D = 0.2 in case of fluctuating mean stress states, is suggested for the fatigue assessment to avoid non-conservative results.
机译：这项研究提出了在纵向焊缝和高频机械冲击（HFMI）后处理条件下，在恒定振幅载荷（CAL）和可变振幅载荷（VAL）下，纵向加劲肋试样的疲劳测试结果。实验采用了分别在R = 0.1和R = -1时的低应力钢S355和高强度钢5700样品。 VAL测试是使用直线分布进行的，序列长度为2.10（5）个负载周期，其遗漏水平为最大应力范围的19％。测试结果表明，在CAL下进行HFMI处理具有明显的优势。相反，在VAL的情况下，疲劳强度的增加会大大降低。对研究的低碳钢S355试样的X射线残余应力测量结果表明，即使在相当小的载荷应力范围内，HFMI处理引起的焊趾处局部压缩残余应力状态也会出现一定程度的松弛。与CAL相比，这种现象导致VALMI下HFMI治疗的获益降低。在确定VAL的等效应力范围的基础上对指定的损伤总和进行评估表明，根据IIW推荐的疲劳设计曲线，D = 1.0至D = 0.5之间的损伤总和非常适用于保守疲劳评估。但是，考虑到在CAL下进行HFMI处理的接头的实验测试结果，可以简化零件的轻量化设计，建议将减小的指定损伤总和D = 0.3，或者在平均应力状态波动的情况下降低到D = 0.2，以进行疲劳评估。以避免非保守的结果。

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