中文摘要：

在恒定的平均应力作用下,考虑焊接接头的实际工况,利用红外热像技术建立了快速预测焊接接头疲劳参数和残余寿命的模型,实现了定量热像法对非均质焊接接头疲劳性能的评估。通过红外热像仪监测焊接接头表面局部热点的变化,定性分析了损伤演化状态。结果表明：定量热像法克服了传统疲劳实验方法的局限性,可快速、准确地确定非均质焊接接头的疲劳性能。同时,通过对疲劳损伤过程中热点区域的实时监测说明其是一种有效的检测方法。

英文摘要：

With the specific nominal mean stress,considering the real operating situations of welded joints,the model for fast assessing the fatigue parameters and the residual fatigue life,was established by the infrared thermographic technique,realizing the fatigue performance evaluation of inhomogeneous welded joints using quantitative thermographic method.The damage evolution status was qualitatively analyzed by monitoring the hot-spot variation on the welded joint surface.The results show that limitations of the traditional method are avoided,and that fatigue behavior parameters of inhomogeneous welded joints can be determined fast and accurately by quantitative thermographic method.Moreover,it is proved to be an effective way for health detection resorting to the hot-spot variation detected real-timely during the fatigue process.