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以U型管式换热器管板为例,利用Ansys有限元软件的瞬态分析模块对其动应力进行了有限元计算,通过有限元分析对模型进行了简化和当量处理,并对换热器管板进行了强度和疲劳评定.结果表明:计算和分析结果更符合U型管式换热器管板真实的动应力分布,其最大动应力在管板与壳程筒体连接应力槽处,适当增大过渡圆角半径可使管板两侧应力趋于相等;由温度产生的热应力对管板总应力影响很大,在计算中不能忽略温度载荷的影响;评定结果表明,该换热器符合强度和疲劳要求.
Taking the tube plate of U-tube heat exchanger as an example, the transient stress analysis module of Ansys finite element software is used to calculate the dynamic stress. The finite element method is used to simplify and treat the model. The results show that the calculation and analysis results are more in line with the true dynamic stress distribution of the U-tube heat exchanger tubesheet, and the maximum dynamic stress is between the tube plate and the shell-side barrel connected with the stress groove , The appropriate increase of the fillet radius can make the stress on both sides of the tube plate tend to be equal; the thermal stress caused by the temperature has a great influence on the total stress of the tube plate, and the influence of temperature load can not be neglected in the calculation; The heater meets the strength and fatigue requirements.