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Title: Yield strength and plasticity of high-strength pipelines
Category: Technical papers from the Journal of Pipeline Integrity
Downloadable: Yes 
Catalog No.: 2058
Date of Publication: Third Quarter, 2004
Price: $25.00 US
Authors: Alan Glover & Brian Rothwell
Abstract: Pipelines are increasingly being designed using a strain-based approach for secondary loads, and formal reliability-based approaches are being developed. These methods address the strength requirements in terms of specific limit states (tensile or compressive), and a rational approach to target reliabilities based on the consequences of exceedance. Historical stress-based approaches focused mainly on the hoop stress and its relationship to the specified minimum yield strength; no particular attention was paid to the post-yield stress-strain behavior of the material. The application of these alternative design approaches, together with the use of higher-strength pipeline steels (Grade 690, X100) have shifted that focus, and yield and early plasticity behavior becomes a critical factor. This paper will look at recent work on defining pipe yield strength relative to small-scale behavior, as well as on plasticity behavior of higher-strength materials. In designs that include strain-based approaches it becomes clear that the stress-strain properties must be clearly understood, particularly in the post-yield regime, and that the effects of realistic stress states and loading regimes must be accounted for.
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