Abstract
A method is proposed for predicting the growth of surface cracks in the wall of a main pipeline under the action of exploitative forces. An elastoplastic model for the growth of surface cracks under biaxial loading is described using steel 20 as an example. Using the ANSYS program, a crack growth modeling algorithm has been developed which takes into account residual stresses. The forms and magnitudes of crack opening for variable cycles of pipeline loading are determined. The influence of the stress state before the crack tip at variable loads on the growth rate of cracks has been established. The effect of overload cycles on crack growth is researched. A method for predicting the development of cracks according to the internal diagnostics of the pipeline and monitoring their loading is described.
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