Correction Method of Notch Equivalent Stress of Welded Structure and Application Analysis
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摘要: 为了提高16Mn钢焊接接头疲劳寿命预测的准确程度，首先应用3种不同方法对十字焊接接头的疲劳寿命进行预测，验证了切口应力等效取值法考虑了应力集中对16Mn钢疲劳寿命的影响。其次，采用基于切口应力强度因子理论的切口应力等效取值法对焊接接头的疲劳寿命进行预测。与试验结果对比表明：应用切口应力等效取值法对16Mn钢焊接接头寿命的评估结果存在误差。结合16Mn钢十字焊接接头试验结果，引入切口等效应力修正系数，得到适用于16Mn钢常用焊接接头的修正切口等效应力公式。Abstract: In order to improve the accuracy of the fatigue life prediction of 16Mn steel welded joints, this article first uses three different methods to predict the fatigue life of cross welded joints respectively, and verifies that the notch stress equivalent value method considers the effect of stress concentration on the fatigue life of 16Mn steel. Secondly, the notch stress equivalent value method based on notch stress intensity factor theory is used to predict the fatigue life of welded joints again. The comparison with the test results shows that there is larger error in the evaluation results of the 16Mn steel welded joint life using the notch stress equivalent value method. Combined with the test results of 16Mn steel cross welded joints, the notch equivalent stress correction coefficient is introduced, and a modified notch equivalent stress formula suitable for commonly used 16Mn steel welded joints is obtained.
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Key words:
- modified notch equivalent stress method /
- 16Mn steel /
- fatigue life /
- welded structure
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表 1 主S-N曲线参数(钢材)
统计依据 Cd h′ 中值 19 930.2 0.319 5 +2σ 28 626.5 0.319 5 -2σ 13 875.7 0.319 5 +3σ 34 308.1 0.319 5 -3σ 11 577.9 0.319 5 
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表 2 切口应力等效取值点分段函数式参数
参数 as/mm 1~10 10~100 100~1 000 A/mm 0.520 67 0.808 75 2.059 8 B 0.139 15 0.056 5 0.009 28 C/mm-1 -0.010 92 -8.410 88×10-4 -1.970 16×10-5 D/mm-2 6.350 04×10-4 7.238 25×10-6 1.906 44×10-8 E/mm-3 -1.602 56×10-5 -2.486 89×10-8 -6.860 43×10-12
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表 3 不同应力水平下的切口等效应力
应力水平σn、MPa 125 135 145 155 165 175 切口等效应力σy、MPa 140 151 162 174 185 196
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表 4 不同应力水平下的切口等效应力和预测寿命
Δσn/MPa Δσy/MPa 预测寿命N/次 85 95.32 1 992 970 97 108.32 1 358 154 101 112.65 1 207 394 105 116.98 1 078 146 108 121.32 988 428 110 150.78 966 707 120 133.99 717 503 125 139.92 630 088 128 142.98 590 509 140 156.03 454 377 147 164.64 386 739 151 168.97 357 746 155 173.00 333 352 163 181.97 286 431 175 196.74 226 654
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