针对管节点有限元分析中，热点应力插值参考点没有节点结果的问题，对管节点热点应力计算方法进行研究。在管节点相交区域建立相贯线的参数方程，并通过曲线积分与数值计算的方法得到相贯线外延线的方程。通过外延线离散的关键点建立面的方式，对网格节点的大小与位置进行控制。并编写管节点热点应力计算程序，以T型及KT型管节点为例，比较数值计算与规范公式得到的热点应力的差异。结果表明，利用本文提出的方法，划分的网格可以容易且准确的提取参考点的应力结果，并且可以编写在APDL程序中，实现建模到结果分析的自动化处理，不仅提高疲劳校核效率，同时提高计算结果的精度。
In the finite element analysis of tubular joints, there usually wasn't node where the interpolation reference points lay, so the calculation method was studied. The parametric equation of intersecting line was established at the intersection of tubular joints. And the equation of extended line from intersecting line was obtained by the method of curvilinear integral and numerical calculation. The size and position of the grid were controlled by establishing area through keypoint. The program to calculate hot spot stress of pipe joints was compiled. And the T type and KT type tubular joints were analyzed. The differences between numerical calculation and standard formula were compared. Research suggests that the results of reference points can be easily and accurately obtained by the method this paper proposed. The method can be written in APDL program in order to realize the automatic analysis from modeling to post process. This method can not only improve the efficiency of fatigue check, but also improve the calculation accuracy.
2016,(s1): 118-122 收稿日期：2016-07-26
DOI：10.3404/j.issn.1672-7619.2016.S1.021
分类号：P751
基金项目：国家自然科学基金资助项目（51409068；51209046）；中国博士后科学基金资助项目（2015M571396）
作者简介：秦培江(1991-),男,硕士研究生,研究方向为船舶与海洋结构物设计制造。
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