一种局部凸耳应力的简化热负荷评估方法

T. Matsumiya, Daniel Garcia-Rodriguez, A. Nebu, N. Takamura
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引用次数: 0

摘要

本文提出了一类管道u型凸耳局部热应力的评估方法。首先,采用三维有限元分析(3D-FEA)进行热瞬态评估,获得了实际范围内管耳系统随时间变化的温度分布。然后将这些结果用作结构3d有限元分析和非强制性附录Y[1]中相应的热应力项的输入。可以看出,附录- y中的公式不能解释通过详细的有限元计算得到的热应力。采用简化的二维有限元分析方法进行参数研究,结果表明,凸耳局部热应力受:(1)管道与凸耳厚度比,(2)相邻凸耳之间的距离,以及(3)凸耳高度的显著影响。因此,根据这些参数提出了一组校正系数。当将所提出的修正系数应用于附录Y方法时,可以获得足够保守的应力(与三维有限元结果相比)。由于这些修正系数可以从简单的几何考虑中获得,因此所提出的方法成功地考虑了复杂的耳对耳相互作用,同时保留了原始附录Y方法的简单性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Simplified Thermal Load Evaluation Method for Localized Lug Stresses Beyond Sec. III Appendix-Y
In this work an evaluation method for local thermal stresses on class 1 piping due to U-shaped lugs is presented. First, a three-dimensional finite element analysis (3D-FEA) is used to perform a thermal transient evaluation, obtaining the time-dependent temperature distribution of a realistic range of pipe-lug systems. These results are then used as an input for both a structural 3D-FEA and the corresponding thermal stress term in Non-Mandatory Appendix Y [1]. It was seen that the formula in Appendix-Y cannot account for the thermal stresses obtained through the detailed FEA evaluation. A parameter study using a simplified two-dimensional (2D) FEA approach, shows that the localized thermal stresses due to lugs are significantly affected by: (1) pipe-to-lug thickness ratio, (2) distance between adjacent lugs, and (3) lug height. A set of correction coefficients depending on these parameters is therefore proposed. When applying the proposed correction coefficients to the Appendix Y method, adequately conservative (when compared with 3D FEA results) stresses can be obtained. Since these correction coefficients can be obtained from simple geometric considerations, the proposed method successfully accounts for the complex lug-to-lug interaction while retaining the simplicity of the original Appendix Y approach.
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