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Title: Analysis of non-coplanar pressurized laminations in X52 steel pipe by non-linear finite elements
Category: Technical papers from the Journal of Pipeline Integrity
Downloadable: Yes 
Catalog No.: 2059
Date of Publication: Third Quarter, 2004
Price: $25.00 US
Authors: Jorge Luis González, Alfredo Morales & José Manuel Hallen
Abstract: Hydrogen-induced cracking is of great interest in the mechanical integrity assessment of sour gas pipelines. Multiple stepwise cracks with internal pressure, called laminations, are often observed in pipelines, and their interaction and coalescence may significantly affect the residual strength of the pipe. In this work, the interacting fields of non-coplanar pressurized laminations in the wall of a pipe under pressure are analyzed by non-lineal finite elements, considering an isotropic hardening law and the real tensile properties of the X52 steel. The results are presented as the evolution of the stress fields in the interlaminar region, as a function of the pressure inside the laminations. It is found that for two approaching stepwise laminations, the critical pressure follows a hyperbolic law, in which the effect of the lamination length is greater for greater lengths while for shorter lengths it is a minimum. The critical pressure is defined as pressure inside the lamination that causes plastification of the interlaminar region.
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