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Application of a Fracture-Mechanics Approach to Gas Pipelines

Authors: Ľubomír Gajdoš, Martin Šperl


This study offers a new simple method for assessing an axial part-through crack in a pipe wall. The method utilizes simple approximate expressions for determining the fracture parameters K, J, and employs these parameters to determine critical dimensions of a crack on the basis of equality between the J-integral and the J-based fracture toughness of the pipe steel. The crack tip constraint is taken into account by the so-called plastic constraint factor C, by which the uniaxial yield stress in the J-integral equation is multiplied. The results of the prediction of the fracture condition are verified by burst tests on test pipes.

Keywords: J integral, Axial crack, Fracture-mechanics, Pipeline wall

Digital Object Identifier (DOI):

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