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research-article

Fatigue Crack Growth at ERW Seam of API 5L X-70 Steel Line Pipe at Varied Orientations

[+] Author and Article Information
Craig Taylor

Past Graduate Student Centre for Engineering Research in Pipelines (CERP) University of Windsor, Windsor, Ontario, Canada N9B 3P4
taylor1z@uwindsor.ca

Sreekanta Das

Professor of Structural Engineering and ASME Member Centre for Engineering Research in Pipelines (CERP) University of Windsor, Windsor, Ontario, Canada N9B 3P4 519 253 3000 Ex. 2507
sdas@uwindsor.ca

Laurie Collins

Director, Research EVRAZ North America Regina, Saskatchewan, Canada S4P 3C7
Laurie.Collins@evrazna.com

Muhammad Rashid

Sr. Research Engineer EVRAZ North America Regina, Saskatchewan, Canada S4P 3C7
Muhammad.Rashid@evrazna.com

1Corresponding author.

ASME doi:10.1115/1.4035385 History: Received July 19, 2016; Revised November 24, 2016

Abstract

Very few studies have been conducted concerning fatigue in steel line pipe and fewer using full-scale testing. Further, at the time of this study, no research based on full-scale testing was available in open literature regarding longitudinal fatigue cracks, despite being considered more critical. In the current research work, fatigue crack growth was investigated in NPS 20, API 5L X 70 grade, ERW straight-seam steel line pipes in the base metal and at the weld seam for various orientations. It was found that there was no significant difference between fatigue crack growth in the base metal and at the weld seam for the tested stress ratio. Increasing the angle of inclination of the crack with respect to the weld line was found to decrease the rate of fatigue crack growth due to a decrease in the Mode I stress component. Finally, it was observed that despite the difference in fatigue crack growth rates, the crack aspect ratios were nearly identical for all cracks at the same crack depth.

Copyright (c) 2016 by ASME
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