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Chernyatin A. S., Razumovsky I. A., Zorin A. E., Zorin N. E.
Evaluation of the crack resistance of a pipeline with an internal crack by the deformation response on the outer surface

Ukhta State Technical University, Ukhta

The aim of the presented work is to show the possibility of estimating the crack resistance of a pipeline with a surface crack located on the inner side of the wall using the recorded deformation response on the outer surface during loading / unloading of the pipeline. The solution of this problem is carried out in two stages: at the first stage, the localization and geometrical parameters of the defect are determined on the basis of mathematical processing of displacements fields of points on the pipeline surface in the defected area recorded by optical methods. At the second stage, the singular and nonsingular terms of stress expansion in the vicinity of the crack front are calculated to apply the crack resistance criteria of the so-called two-parameter fracture mechanics.

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