某构件焊缝疲劳开裂的寿命预测方法应用对比

某轨道车辆的一个横向减振器座的焊缝在服役过程中出现了疲劳裂纹.?为了找到疲劳开裂的原因,在获得疲劳载荷谱的情况下,分别采用名义应力法、热点应力法以及结构应力法对开裂焊缝进行了疲劳寿命数值仿真计算.?数值仿真计算的结果表明,与名义应力和热点应力法相比较,结构应力法的计算结果最符合实际情况,且在焊缝应力集中的识别能力上,结...

Comparison of fatigue life predicting methods used in cracked welded component

Fatigue cracks appeared in a weld on a transverse shock absorber seat of a railway vehicle during service. By using the fatigue load spectrum, the numerical simulation calculation of fatigue life of cracked welds is carried out by using the nominal stress, hot spot stress and structural stress method respectively. The numerical simulation results show that, the calculation results of the structural stress method are the most consistent with the engineering practice compared with the nominal stress method and the hot spot stress method, and the structural stress method is also obviously better than the other two methods in the identification ability of the stress concentration. Combined with this specific engineering example, this paper further discusses the essential differences of these three methods, and puts forwards a concluding opinion, that is, the structural stress method is most worthy of being popularized in application in the process of anti-fatigue design of welded structures.