«Proceedings of Gubkin University»

Computational and experimental assessment of strength and service life of main pipeline in the presence of external defects

UDC: 621.643.002.2
DOI: -

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: laboratory samples, pipeline, durability, destructive stresses, cracks, strength, resource, plasticity

Annotation:

The article presents the results of experimental and theoretical studies of the strength and service life of the main pipeline at the stage of crack formation with subsequent destruction. Experimental studies provided for static and cyclic loading of laboratory samples simulating a crack in the form of artificial incisions and real scratches. Under static loading, the destructive stresses of the samples with a bully were higher compared to the incision. The crack development was more intense here. In the case of cyclic loading, the initial formation of a crack with a bully occurred earlier than in laboratory samples with an incision. The destruction of the samples with a bully was observed at higher voltages. The durability of laboratory samples with incisions and bulges under cyclic loading was determined by the equations of fatigue curves. For incised samples, the plasticity of the material was taken into account. The bullied samples provided for the presence of plasticity and its exhaustion with a change in the mechanical properties of the material in the crack zone. The durability during the formation of a crack in the bully zone was less than in the case of an incision.

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