Nonlinear elastic-plastic stress investigation for two interacting 3-D cracks in offshore pipelines

Under continuous loading conditions, small closely distanced cracks can grow and coalesce into a large one that may subsequently pose a threat to the integrity and safety of structures. Although many research works were carried out for predicting fatigue growth of multiple cracks, few papers focusin...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2015-05, Vol.38 (5), p.540-550
Main Authors: Zhang, Y. M., Ariffin, M. Z., Xiao, Z. M., Zhang, W. G., Huang, Z. H.
Format: Article
Language:English
Subjects:
Crack propagation
Cracks
CTOD
Fatigue failure
fracture assessment
Fracture mechanics
Mathematical models
Metal fatigue
Nonlinearity
Offshore
Offshore engineering
Pipelines
Three dimensional
two interacting cracks
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Summary:Under continuous loading conditions, small closely distanced cracks can grow and coalesce into a large one that may subsequently pose a threat to the integrity and safety of structures. Although many research works were carried out for predicting fatigue growth of multiple cracks, few papers focusing on nonlinear elastic–plastic analysis of multiple cracks' fracture behaviours can be referred to. In this study, 3‐D elastic–plastic investigation has been performed on fracture behaviours of two collinear cracks located in offshore pipelines. The influences of the cracks configuration, the separation distance and internal pressure of the pipeline on the crack behaviours are investigated. On the basis of the numerical results, a new strain‐based crack tip opening displacement estimation method is proposed for assessing the fracture behaviour of flawed pipelines with two interacting collinear cracks.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12259