B2 stress index for structurally distorted pipe bends under in-plane opening bending moment

被引：10

作者：

Balakrishnan, S. ^{[1
]}

Veerappan, A. R. ^{[1
]}

Shanmugam, S. ^{[1
]}

机构：

[1] Natl Inst Technol, Dept Mech Engn, Tiruchirappalli 620015, Tamil Nadu, India

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 2019年 / 176卷

关键词：

Nuclear pipe bends; Twice-elastic slope; Nonlinear finite element analysis; Opening bending moment; Ovality; LIMIT LOADS; INTERNAL-PRESSURE; ELBOWS; OVALITY;

D O I：

10.1016/j.ijpvp.2019.103957

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present study determines the effect of shape imperfections on the B-2 index of pipe bends subjected to in plane opening moment using 3D nonlinear finite element (FE) methodology. The analysis considers the large strain formulation option and the material behavior is elastic-perfectly plastic. The reaction moment versus angular rotation curves are plotted for all the simulated pipe bends and the plastic collapsing moments are determined using Twice-elastic slope technique as recommended in ASME B&PV, section III (clause NB-3213.25). The B-2 stress index was computed for each model from their respective collapse moment. The variable wall thickening in the pipe bends cross section yields negligible effect and the presence of ovality has a momentous effect on B-2 stress indices. A mathematical equation is suggested to compute B-2 stress index for pipe bends with ovality subjected to in-plane opening bending moment.

引用

页数：11

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