文献类型：期刊文献

英文题名：Finite element-based limit load of piping branch junctions under combined loadings

作者：Xuan, Fu-Zhen[1]; Li, Pei-Ning[1]

机构：[1]E China Univ Sci & Technol, Sch Mech Engn, Shanghai 200237, Peoples R China

年份：2004

卷号：231

期号：2

起止页码：141

外文期刊名：NUCLEAR ENGINEERING AND DESIGN

收录：;EI(收录号：2004268233045);WOS:【SCI-EXPANDED(收录号:WOS:000222422300002)】；

语种：英文

外文关键词：Defects - Finite element method - Linear equations - Loading - Method of moments - Nonlinear control systems - Piping systems - Quadratic programming - Waveguide junctions

摘要：The limit load is an important input parameter in engineering defect-assessment procedures and strength design. In the present work, a total of 100 different piping branch junction models for the limit load calculation were performed under combined internal pressure and moments in use of non-linear finite element (FE) method. Three different existing accumulation rules for limit load, i.e., linear equation, parabolic equation and quadratic equation were discussed on the basis of FE results. A novel limit load solution was developed based on detailed three-dimensional FE limit analyses which accommodated the geometrical parameter influence, together with analytical solutions based on equilibrium stress fields. Finally, six experimental results were provided to justify the presented equation. According to the FE limit analysis, limit load interaction of the piping tees under combined pressure and moments has a relationship with the geometrical parameters, especially with the diameter ratio d/D. The predicted limit loads from the presented formula are very close to the experimental data. The resulting limit load solution is given in a closed form, and thus can be easily used in practice. (C) 2004 Elsevier B.V. All rights reserved.