Supercharged boilers are widely used as the core equipment of ship steam-power plants. A 1:1 model is built considering the connection details of tube-tubesheet joints. Furthermore, numerical simulation of stress field and fatigue life based on the DBA method is conducted. The results show that the maximum equivalent stress amplitude of 253.81 MPa appears on the tube-tubesheet joint of the tube plant radiation area. The total stress amplitude is dominated by the thermal stress range. The last calculated permissible number of cycles based on the fourth strength theory is 161,744 times, which is 15.7% higher than the result calculated by the third strength theory.

增压锅炉被广泛用作船舶蒸汽发电厂的核心设备。考虑管-管板接头的连接细节，构建了1：1模型。此外，基于DBA方法进行了应力场和疲劳寿命的数值模拟。结果表明，试管植物辐射区的管-管板接头处出现最大等效应力幅值为253.81 MPa。总应力幅度由热应力范围决定。基于第四强度理论循环的上一次计算的许可数为161744倍，这比由计算出的结果高15.7％的第三强度理论。