Fretting Fatigue Test and Simulation Analysis of Steam Generator Heat Transfer Tube

In a steam generator, the heat transfer tubes are supported by contact with support plates and anti-vibration bars. The two-phase flow flows over causes vibration when operating. fatigue analysis, tube is simplified to beam model, contacts bars as simple-supported boundary conditions. This linear simplification improves computational efficiency but cannot simulate actual situation of area. consideration this situation, in downwards modified S–N curve used envelop fretting. For different materials pressure, modification needs be obtained through experimental analysis. paper, effect fretting on performance material 690 alloy discussed means high cycle test specimen room temperature air, low sheet water environment, SWT (Smith–Watson–Topper) predicting simulation, conservatism design discussed. It shown that, range cycle, strength lower than mean curve, it can still enveloped ASME (the American Society Mechanical Engineers). However, under condition ultra-high no longer performance, so further downward necessary ensure safety design.