内压下焊制管道三通塑性极限载荷有限元分析

本文采用理想弹塑性材料及小形形假设的有限元技术,系统分析并验廉政管径比d/D≥0．5管道焊接三通的塑性极限压力及风格密度,单元类型和约束形式对数值解的影响,结果表明,在管径d/D0≥0．5的范围内,等径三通的极限承载能力优于d/D=0.83和d/D=0.65的主管径厚比D／T相同的异径等强度三通,且在D／T较大时尤为明显,采用小变形的分析方法能够得到满足工程要的极限压力数值解。

Finite Element Analysis of Plastic Ultimate Load for Welded T Junction Pipe Subjected to Internal Pressure

In this paper, the finite element technique based on the hypotheses of ideal elastic plastic material and small defection was applied to systematically analyze the affections of plastic ultimate pressure, the type of the elements and constraints to the value of the numerical solution for welded pipe with T junction when the ratio of d/D is greater than or equal to 0.5. It is proved from the calculation and experiment that within the scope stated above, equal diameter T junction pipe has the better ability to sustain the pressure load than unequal diameter T junction pipes that have the diameter ratio d/D of 0.83 and 0.65 and have the same ratio of D/T. It is more apparent when the ratio of D/T is larger. The numerical solution that meets the requirement in engineering use can be obtained by use of the analysis method based on the hypothesis of small deflection.