Fatigue Analysis for the Lower Assembly of a U-Tube Steam Generator

Moli Cao
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Abstract

The lower assembly of a U-tube steam generator consists of a hemispherical primary channel head with a flat bottom, a perforated tubesheet, a partition plate, and a portion of lower shell. The partition plate divides the primary channel head into two halves. Each half contains a primary nozzle and a manway opening. The fatigue analysis of the lower assembly of a U-tube steam generator can be a challenge due to the complexities of the geometry and loading conditions. In this paper, the development of a global finite element model including all important features and several submodels to cover the effects of all these features is described. The tubesheet is simulated using equivalent solid properties with orthotropic material properties. The thermal loads from the inner surfaces of the tubes embedded in the tubesheet are implemented using surface elements. The submodeling technique is utilized to evaluate the local small features, such as tube holes at primary and secondary faces of the tubesheet, with the constraints at the cut-boundaries and the temperature fields of the submodel being extracted from the global model.
u型管蒸汽发生器下总成疲劳分析
一种u型管蒸汽发生器的下组件,由具有平底的半球形主通道头、穿孔管板、隔板和部分下壳体组成。隔板将主通道头分成两半。每半部分包含一个主喷嘴和一个通道开口。由于u型管蒸汽发生器的几何形状和负载条件的复杂性,对其下部组件进行疲劳分析是一项挑战。本文描述了一个包括所有重要特征和几个覆盖所有这些特征影响的子模型的全局有限元模型的发展。采用等效固体特性和正交各向异性材料特性对管板进行了模拟。嵌入管板的管的内表面的热负荷是用表面元件来实现的。利用子模型技术对管板主、次面管孔等局部小特征进行评估,从全局模型中提取切界约束和子模型的温度场。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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