结构的可靠性挖掘机部分钢结构件的载荷情况是恶劣的,例如单斗挖掘机的采掘作业装置等,载荷反复循环变化,构件上生成裂纹或原有裂纹等缺陷的渐渐扩大,使这些构件或焊缝在甚至比屈服限低得多的计算应力值下就发生了破坏, Structural Reliability Excavator part of the steel structure of the load conditions are poor, such as single-bucket excavator excavation device, the load cycle repeated changes, the formation of cracks on the component or the original crack and other defects gradually expanded so that these components Or the weld breaks down even at calculated stresses much lower than the yield point,