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采用红外热像法对循环载荷下AZ31B镁合金电子束焊接接头的疲劳行为进行研究。对试件在疲劳试验中表面温度演变规律和产热机制进行分析,并在此基础上对其疲劳极限进行预测,同时通过分析试件表面温度和热点区域的演变规律对其疲劳损伤进行定量评估。结果表明:采用红外热像法不仅能够实现对镁合金电子束焊接接头疲劳极限的快速预测,而且可以对其疲劳损伤进行实时定量监测。镁合金电子束焊接接头疲劳极限预测结果同传统S-N试验结果保持一致。试件表面温度以及热点区域演变可作为评价镁合金电子束焊接接头疲劳损伤的有效依据。
The fatigue behavior of electron beam welded joints of AZ31B magnesium alloy under cyclic loading was studied by infrared thermography. The surface temperature evolution law and the thermo-mechanical mechanism of the specimen during fatigue test were analyzed. Based on this, the fatigue limit was predicted. Meanwhile, the fatigue damage was quantitatively evaluated by analyzing the surface temperature of the specimen and the evolution of hot spots . The results show that the infrared thermography method can not only predict the fatigue limit of magnesium alloy electron beam welded joints but also monitor the fatigue damage quantitatively in real time. The predicted fatigue limit of magnesium alloy electron beam welded joint is consistent with that of conventional S-N test. The surface temperature of the specimen and the evolution of the hot spot area can be used as an effective basis to evaluate the fatigue damage of electron beam welded joints of magnesium alloy.