Application of Two-Parameter Fracture Mechanics for Analyzing the Crack Resistance of Pipeline Systems
Authors: Pokrovskiy A.M., Zakharov P.M., Kazantsev A.I.
Published in issue: #10(178)/2026
Category: Mechanics | Chapter: Mechanics of Deformable Solid Body
For a pipe model with a longitudinal crack and a biaxially stretched plate with a crack, a comparison of the results of numerical calculation in the ANSYS finite element software package of the main parameters of two-parameter linear fracture mechanics, namely the stress intensity factor and the non-singular Txx and Tzz stresses entering the Williams asymptotic stress distribution in the vicinity of the crack front in a three-dimensional body, is carried out. It is shown that for analyzing the crack resistance of a gas pipeline, a plate computational model can be used without loss of accuracy. At the same time, the number of finite elements is reduced by more than a factor of 3 compared to the pipe model. An assessment of the crack resistance of a linear section of a main gas pipeline with a longitudinal surface semi-elliptical crack at a distance from the transverse weld is carried out. It is established that the one-parameter Irwin force fracture criterion yields underestimated results compared to the more accurate two-parameter fracture criterion, which takes into account the biaxial constraint of deformations along the crack front. It is shown that as the ratio of the semi-length of the semi-elliptical longitudinal surface crack in the gas pipeline to its depth increases, the critical crack depth decreases.
EDN WKOWAY
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