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文中采用有限元与试验方法系统地分析了主圆支方K型管节点在平面内弯矩作用下的应力集中系数。使用ABAQUS软件进行了125组在平面内弯矩作用下节点的数值模拟,得到了K型管节点在平面内弯矩作用下焊缝区域的应力集中系数,并且对主管和支管的应力集中系数进行了系统研究,分析了节点几何参数对主管和支管的应力集中系数的影响。结果表明,β(支管与主管直径比值)和2γ(主管直径与壁厚比值)值对节点的应力集中系数影响较大,而τ(支管与主管壁厚比值)对主管和支管的应力集中系数影响较小。主管的应力集中系数值主要出现在鞍点的附近,而支管的应力集中系数值出现的位置主要由β、2γ和τ等几何参数来决定。根据有限元模型的分析结果,通过曲线拟合提出了计算平面内弯矩作用下主圆支方K型管节点应力集中系数的参数方程,并对该方程的准确性进行了评价。最后,通过节点平面内弯曲试验再次验证了本文提出的应力集中系数公式的可靠性和安全性。
In this paper, the finite element method and the test method are used to systematically analyze the stress concentration factor under the action of in-plane bending moments of K-tube joints. ABAQUS software was used to carry out the numerical simulation of 125 joints under in-plane bending moment. The stress concentration coefficient of the weld zone under the action of in-plane bending moment was obtained. The stress concentration factor of the main pipe and branch pipe A systematic study was conducted to analyze the effect of node geometry on the stress concentration factor of the main and branch pipes. The results show that the values of β (branch-to-branch diameter ratio) and 2γ (branch-to-branch diameter to wall thickness ratio) have a greater influence on the stress concentration factor of joints, while τ (branch to branch wall thickness ratio) Less affected. The stress concentration factor of the supervisor mainly appears in the vicinity of the saddle point, while the location of the stress concentration factor of the branch pipe mainly depends on the geometric parameters such as β, 2γ and τ. According to the analysis results of the finite element model, the parametric equation of stress concentration factor of the K - tube joint under the action of in - plane bending moment was proposed by curve fitting, and the accuracy of the equation was evaluated. Finally, the reliability and safety of the stress concentration factor formula proposed in this paper are verified again by the in-plane bending test.