Diagnostics of damages in the pre-destruction zone during low-cycle loading in pipeline systems

Abstract

Abstract The paper considers the methodology for determining the location of fatigue destruction using non-destructive testing methods, as well as the assessment of the residual resource. The metal of the main pipeline was tested to test the determination of the stress-deformed state. The main causes of the destruction of pipeline systems were investigated and the choice of non-destructive testing methods that were adequate in terms of the diagnostics of main pipelines was justified. The developed methodology for testing low-cycle fatigue of samples of main pipelines that were in operation allows us to establish regularities of change in the stress-deformed state and magnetic characteristics of the material of main pipelines at various stages of its life cycle. The iterative cyclic experimental studies carried out make it possible to determine the potential destruction zone and evaluate the effect of the number of cycles on the residual resource of the pipeline. Experimental data correlate with data obtained using a digital network-centric system.