基于不同S-N曲线的横向十字焊接接头疲劳寿命预测
Fatigue life prediction of transverse cross welded joint based on different S - N curve
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摘要: 通过疲劳分析软件MSC.Fatigue自动生成了3种不同S-N曲线,即试验S-N曲线、经验S-N曲线和标准S-N曲线,考虑了残余应力、平均应力、接头外形对焊接疲劳的影响,并按相关规则修正后对碳钢Q235B十字焊接接头进行了疲劳寿命预测,并进行了比较分析.结果表明,基于MSC.Fatigue的S-N曲线法模拟的焊接接头疲劳损伤部位及损伤程度与试验结果一致;试验S-N曲线预测值与标准S-N曲线预测值偏差在7.9%~28%,与经验S-N曲线预测值偏差3.3%~19%,经验S-N曲线预测结果偏高,而标准S-N曲线预测结果相对比较保守.Abstract: Three kinds of S-N curves including experimental S-N curve,experience S-N curve and standard S-N curve were established by MSC.Fatigue software.The effects of residual stress,average stress and joint shape were considered.And these curves were revised according to the related criterion and used to predict the fatigue life of Q235B cross-shaped welded joint.The results show that,the fatigue damage locations of welded joint is consistent with that of experiment by S-N curve method based on MSC.Fatigue.The deviation is 7.9%-28% between the prediction values of experiment S-N curve and that of standard S-N curve.The deviation is 3.3%-19% between the prediction values of experiment S-N curve and that of experience S-N curve.The prediction values of experience S-N curve are higher than that of experiment S-N curve and that of standard S-N curve is more conservative.
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