蒸汽冷凝管壁残余应力分析

采用盲孔法现场测试残余应力和数值仿真分析相结合的方法研究超临界发电机组蒸汽冷凝管焊口部位的应力状态，为爆管事故原因分析提供依据。管屏拼装过程中焊接和强制对口等因素所产生的残余应力和工作应力叠加，部分管口会处于较高的应力水平，有时甚至会超过其屈服强度。同时依据现场应力检测和数值模拟分析，对蒸汽冷凝管壁开槽处理效果进行了分析论证。

Analysis on Residual Stress of Steam Condenser Pipe

Using the blind-hole method to test the residual stress of the condenser tube，and using the numerical analysis method，the stress state of crater location in steam condenser pipe was analysed to provide the basis for the analysis of the cause of the tube bursting accident. The residual stress and working stress caused by welding and forced counterpart were superimposed in the assembling process of tube panel，part of the weld will be at a higher level of stress，sometimes even more than its yield strength. Analysis and demonstration of the slotting effect of the steam condenser pipe wall were also carried out by the method of stress testing and numerical simulation analysis.