Reliability and durability of pipeline tubes are mainly affected by repeated alternative pressure, the processes of corrosion and erosion. These phenomena cause degradation of material on the internal surface of the tube. However the traditional methods (experimental and theoretical) of investigation of such damage processes are developed as if these processes acted separately, independently from each other. There are some works in which the joint effect of two phenomena is observed: corrosion-mechanical fatigue and erosive corrosion (or corrosive erosion). Meanwhile in reality the processes of mechanical fatigue, corrosion and hydro erosion act simultaneously and develop in the same part of the tube.

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