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Title: Nonlinear elastic-plastic stress investigations on two interacting 3-D cracks in offshore pipelines subjected to different loadings
Authors: Zhang, Yanmei
Fan, Mu
Xiao, Zhongmin
Keywords: DRNTU::Engineering::Mechanical engineering
Interacting Collinear Cracks
Offshore Pipelines
Issue Date: 2016
Source: Zhang, Y., Fan, M., & Xiao, Z. (2016). Nonlinear elastic-plastic stress investigations on two interacting 3-D cracks in offshore pipelines subjected to different loadings. AIMS Materials Science, 3(4), 1321-1339. doi:10.3934/matersci.2016.4.1321
Series/Report no.: AIMS Materials Science
Abstract: Multiple cracks can be observed in many of engineering structures such as pressure vessels and pipelines. Under continuous loading conditions, these small and closely distanced multiple cracks can grow together into a large one. Subsequently, it will pose a serious challenge to the integrity and safety of the engineering structures. Although a lot of research works were carried out for predicting fatigue growth of multiple cracks, few literatures focusing on nonlinear elastic-plastic analysis of multiple cracks’ fracture behaviors can be referred to. Therefore, to understand the influence of multiple cracks on integrity and safety of offshore pipelines is indeed desirable in engineering practice. In this study the systematic analyses on the fracture behaviors of two collinear 3-D cracks are performed for the pipelines subjected to a series of the loading conditions. A parametric study on the effect of different separation distances of the two interacting collinear cracks is performed. Based on the numerical results, the interaction factor is introduced to quantify the interaction of the two interacting cracks, and the proposed function for interaction factor can be useful for the preliminary fracture assessment of the surface crack affected by the interactions. Moreover, for biaxial loadings, the results indicate that the most severe fracture response can be produced by the tension load combined with high internal pressure.
ISSN: 2372-0468
DOI: 10.3934/matersci.2016.4.1321
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2016 Zhongmin Xiao, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution License (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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