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An extended engineering critical assessment for corrosion fatigue of subsea pipeline steels

Lookup NU author(s): Ankang Cheng, Dr Nianzhong Chen

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

© 2017 Elsevier Ltd Engineering critical assessment (ECA) is widely used to assess the structural integrity in offshore industry. But industry standards provide limited guidance on ECAs of structures subjected to corrosion fatigue (CF). In this paper, a critical stress intensity factor (SIF) derived from a corrosion-crack correlation model is proposed to improve the traditional ECA for steel structures in seawater. The proposed critical SIF extends the traditional ECA for CF in that it accounts for the influence of load frequency and initial crack size on the model selection within current ECA guidelines for the ECA of marine structures under CF. The extended ECA is applied for × 65 carbon pipeline steels subjected to CF. The crack growth curves are built using a three-stage CF crack growth model and the experimental data. Fatigue lives are calculated based on those curves as well as traditional ECA models. Results show that the critical SIF can effectively improve the ECA for × 65 carbon pipeline steels under CF. The extended ECA provides a reasonable assessment with reduced conservatism in contrast to the traditional ECA for CF.


Publication metadata

Author(s): Cheng A, Chen N-Z

Publication type: Article

Publication status: Published

Journal: Engineering Failure Analysis

Year: 2018

Volume: 84

Pages: 262-275

Print publication date: 01/02/2018

Online publication date: 01/12/2017

Acceptance date: 28/11/2017

Date deposited: 18/12/2017

ISSN (print): 1350-6307

ISSN (electronic): 1873-1961

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.engfailanal.2017.11.012

DOI: 10.1016/j.engfailanal.2017.11.012


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