Stress intensity factors for inclined external surface cracks in pressurised pipes

Li, C, Fu, G and Yang, W 2016, 'Stress intensity factors for inclined external surface cracks in pressurised pipes', Engineering Fracture Mechanics, vol. 165, pp. 72-86.


Document type: Journal Article
Collection: Journal Articles

Title Stress intensity factors for inclined external surface cracks in pressurised pipes
Author(s) Li, C
Fu, G
Yang, W
Year 2016
Journal name Engineering Fracture Mechanics
Volume number 165
Start page 72
End page 86
Total pages 15
Publisher Elsevier
Abstract Corrosion, manufacturing defects or complex stress state can induce inclined surface cracks on pipes that lead to failure by mixed mode fracture. Very few studies have been undertaken on stress intensity factors for inclined cracks with mixed modes. This paper presents a combined J integral and finite element method to determine the stress intensity factors for inclined external surface cracks in pressurized pipes. A meshing technique is proposed to model the complex region around the crack. To facilitate the practical use of the proposed method, formulae for the influence coefficients of stress intensity factors with mixed modes are developed. Based on numerical results, it is found that the influence coefficients of Mode I and equivalent stress intensity factors decrease with the increase of the inclination angle along the whole crack front whilst those of Mode II and Mode III reach the maximum when the inclination angle is 45°. It is also found that the influence coefficients of all three modes increase with the increase of crack relative depth along the whole crack front. The results presented in the paper can be used by practitioners to assess the fracture conditions of both brittle and ductile pipes.
Subject Infrastructure Engineering and Asset Management
Keyword(s) Finite element method
Inclined surface cracks
Influence coefficient
J-integral
Pressurized pipes
DOI - identifier 10.1016/j.engfracmech.2016.08.014
Copyright notice © 2016 Elsevier Ltd. All rights reserved.
ISSN 0013-7944
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