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首页> 外文期刊>Fatigue & Fracture of Engineering Materials & Structures >A new proposal for assessment of the fatigue strength of steel butt-welded joints improved by peening (HFMI) under constant amplitude tensile loading
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A new proposal for assessment of the fatigue strength of steel butt-welded joints improved by peening (HFMI) under constant amplitude tensile loading

机译：恒定振幅拉伸载荷下通过喷丸（HFMI）改进的钢对焊接头疲劳强度评估的新建议

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摘要

Experimental fatigue data for butt-welded joints in as-welded condition and under constant amplitude tensile loading were analysed using the effective notch stress system and a new master curve analysis that takes the local stress ratio, R_(local), into account. The local stresses needed for computation of R_(local) are calculated with the notch strain approach in conjunction with the reference radius concept. The main focus was to predict with the derived master curve the fatigue strength of peened butt-welded joints. The lowest surface residual stresses after peening were first estimated based on reported measurements and an analytical lower bound result. The predictions showed quite similar strength dependences and FAT values as reported for high-frequency mechanical impact treated welds for applied stress ratio R = 0.1. The benefits of peening reduce faster for higher strength steels when R increases. When R = 0.5, the FATs are practically the same for all steel grades.
机译：使用有效的缺口应力系统和考虑了局部应力比R_（local）的新的主曲线分析，分析了在焊接条件下和恒定振幅拉伸载荷下对接焊接接头的实验疲劳数据。计算R_（local）所需的局部应力是通过缺口应变方法结合参考半径概念来计算的。主要重点是通过导出的主曲线来预测对接焊缝的疲劳强度。首先根据报告的测量结果和分析的下限结果估算喷丸后的最低表面残余应力。这些预测显示出与施加的应力比R = 0.1的高频机械冲击处理焊缝所报告的强度依赖性和FAT值非常相似。当R增加时，高强度钢的喷丸处理效果会更快降低。当R = 0.5时，所有钢种的FAT几乎相同。

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