含点蚀缺陷三通管塑性极限载荷分析

Plastic Limit Load Analysis of the Piping Branch Junctions with Defect Pitting Corrosion

三通管在使用中受介质的腐蚀或冲刷而产生局部减薄,从而降低其使用的安全性。因此,采用弹塑性有限元方法,分析了含点蚀缺陷引起的局部减薄对三通管极限载荷的影响。在对常用三通管几何尺寸简化为等径等壁厚的基础上,借助ANSYS软件中的设计语言(APDL),构建了参数化有限元模型。通过改变三通管及缺陷的几何参数,建立任意含点蚀缺陷三通管的有限元模型,实现三通管分析流程的过程控制。并研究了三通管几何参数对其塑性极限载荷的影响,为压力管道分析及使用安全提供一定的参考。

Erosion or corrosion can cause the local thinning of piping branct junctions and degrade its integrity. In view of this ,the restrictive element method is used to analyse the impact of the local thinning on the load of the piping branch junctions. In this paper,using software powerful parametric design language （APDL） designed in ANSYS, the finite element model about parameters of the piping branch junctions is established. By altering the piping banch junctions and the geometric parameters of their flaws,a finite element model is then established of any link of the piping branch junctions to realize process control of the flaws of the piping junctions in service. On the basis of this, the effects on plastic limit load with different parameters of the piping branch junctions are studied, providing reference for the design and use of the piping branch junctions.