基于不同应力法的焊接构架纵向角接头疲劳累积损伤评估
Fatigue cumulative damage assessment of longitudinal fillet welded gusset in welded frame based on different stress approaches
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摘要: 在焊接构架结构应力计算整体有限元模型基础上，通过考虑接头角焊缝和1 mm焊趾虚拟缺口半径，对转臂定位座板与箱形侧梁下盖板的组焊纵向角接头进行逐步细化，构建热点应力和有效缺口应力计算局部模型.在动态疲劳试验载荷等效的9级载荷谱作用下，分别基于名义、热点及有效缺口三种不同应力参量，结合ⅡW建议的疲劳设计S-N曲线进行累积损伤计算.结果表明，有效缺口应力的累积损伤远高于名义和热点应力，极有可能引起评估结果过于保守.为充分发挥有效缺口应力法的优势，需要以更加符合结构实际的缺口几何数据和强度数据作为支撑.Abstract: Based on the global FE model of structural stress calculating for welded frame and considering the geometry of fillet welds and 1mm fictitious notch radius, the local hot spot stress and effective notch stress FE model of longitudinal fillet welded gusset, connecting the axle lever plate and box side-beam lower flange, were refined. The 9 levels equivalent fatigue load spectra were determined according to dynamic fatigue testing loads. The cumulative damage calculations based on nominal stress, hot spot stress and effective notch stress were carried out respectively by using the relative fatigue design S-N curves recommended by ⅡW. The result shows that, the resultant cumulative damage based on effective notch stress is far greater than nominal stress and hot spot stress, and the assessment result may be too conservative. In order to take advantage of the effective notch stress approach better, the more real notch geometries and notch strength data should be used.
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