Off-center crack growth analysis of inner-surface crack pipe

QI Tao

doi:10.11889/j.0253-3219.2013.hjs.36.040632

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Off-center crack growth analysis of inner-surface crack pipe

更新时间：2021-06-03

- Off-center crack growth analysis of inner-surface crack pipe
- NUCLEAR TECHNIQUES Vol. 36, Issue 4, Article number: 040632(2013)
- 作者机构：
  
  上海核工程研究设计院
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2013.hjs.36.040632
  CLC： TL353.11;O346.1
- Published：2013
- 稿件说明：
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[1]祁涛.管道内表面非中心裂纹扩展研究[J].核技术,2013,36(04):167-172.

QI Tao. Off-center crack growth analysis of inner-surface crack pipe[J]. Nuclear techniques, 2013, 36(4): 040632
[1]祁涛.管道内表面非中心裂纹扩展研究[J].核技术,2013,36(04):167-172. DOI： 10.11889/j.0253-3219.2013.hjs.36.040632.

QI Tao. Off-center crack growth analysis of inner-surface crack pipe[J]. Nuclear techniques, 2013, 36(4): 040632 DOI： 10.11889/j.0253-3219.2013.hjs.36.040632.

摘要

管道非中心裂纹和中心裂纹扩展规律有所不同

有必要进行研究。目的是得到管道内表面非中心裂纹的扩展规律和路径。采用有限元软件ABAQUS

建立了含非中心内表面裂纹管道的三维线弹性有限元模型

利用Paris公式分析了裂纹的扩展行为。结果是得到了管道内表面非中心裂纹在不同载荷作用下的扩展规律和路径

以及裂纹偏移角度对裂纹扩展的影响

并将计算结果和中心裂纹的分析结果相比较

研究两种裂纹在扩展上的差异。结论为在LBB分析中

泄漏裂纹计算时应考虑裂纹的偏心的影响

裂纹稳定性分析中则无须考虑裂纹偏心。

Abstract

Background: There is a discrepancy between off-center crack and center-crack.Purpose: Crack grow rule and path need to be investigated under different load conditions.Methods: 3D elastic finite element method is used to create an off-center inner-surface crack model based on Paris-law crack grow equation by ABAQUS.Results: Crack grow rule and path are obtained under different load conditions.The influence of the crack rotation angle to crack extension has been researched.At the same time

centered circumferential crack model has been compared with off-centered circumferential crack model

and the discrepancy has been found.Conclusions: In LBB analysis

off-center influence should be considered in crack leakage analysis

but not necessary in crack stability analysis.

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