Net-section limit moments and approximate J estimates for circumferential cracks at the interface between elbows and pipes

被引：7

作者：

Song, Tae-Kwang ^{[1
]}

Kim, Yun-Jae ^{[1
]}

Oh, Chang-Kyun ^{[2
]}

Jin, Tae-Eun ^{[2
]}

Kim, Jong-Sung ^{[3
]}

机构：

[1] Korea Univ, Dept Mech Engn, Seoul 136713, South Korea

[2] Korea Power Engn Co, Yongin 449713, Gyeonggi Do, South Korea

[3] Sunchon Natl Univ, Dept Mech Engn, Sunchon 540742, Jeonnam, South Korea

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 2009年 / 86卷 / 08期

关键词：

Circumferential crack; Elbow; Elastic-plastic J; Finite element limit analysis; In-plane bending; Net-section limit load; Reference stress approach; REFERENCE STRESS; FINITE-ELEMENT; SURFACE CRACKS; PIPING ELBOWS; PLASTIC LOADS; CYLINDERS; DEFECTS; PLATES; BENDS;

D O I：

10.1016/j.ijpvp.2009.03.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper firstly presents net-section limit moments for circumferential through-wall and part-through surface cracks at the interface between elbows and attached straight pipes under in-plane bending. Closed-form solutions are proposed based on fitting results from small strain FE limit analyses using elastic-perfectly plastic materials. Net-section limit moments for circumferential cracks at the interface between elbows and attached straight pipes are found to be close to those for cracks in the centre of elbows, implying that the location of the circumferential crack within an elbow has a minimal effect on the net-section limit moment. Accordingly it is also found that the assumption that the crack locates in a straight pipe could significantly overestimate the net-section limit load (and thus maximum load-carrying capacity) of the cracked component. Based on the proposed net-section limit moment, a method to estimate elastic-plastic J based on the reference stress approach is proposed for circumferential cracks at the interface between elbows and attached straight pipes under in-plane bending. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：495 / 507

页数：13

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