Life cycle durability prediction of high-pressure pipelines under the impact of low-cycle loads

DOI: 10.34759/trd-2019-108-2


Phone H. K.*, Sysoev E. O.**, Kuznetsov E. A.***, Min K. H.****

Komsomolsk-na-Amure State University, 27, Lenina str., Komsomolsk-on-Amur, 681013, Russia



Nowadays, high-pressure pipelines are widely employed aircraft and machine building in hydro-gas and fuel systems. While machines and mechanisms production and operation much attention is paid to control of high-pressure pipelines made of high-strength steel, as well as aluminum and titanium alloys. Pipelines operate under conditions of low-cycle loading impacts from the internal pressure, stretching and torsion, which affect significantly on their long-term strength at various types of the stress-strain state and shapes of loading cycle. Under real operation conditions, these structural elements operate under both linear and complex stressed states. A serious problem of materials consumption and cost reducing arises in the course of designing, ensuring herewith the strength and durability of the part. For the structures failures prevention, overstated strength margins are specified, and, as a consequence, increase their materials consumption and cost. However, with this approach microstructure damages of the material and abrupt change of the material strength while damage accumulation while fabrication and operation are not accounted for.

The problem solution consists in setting quantitative and qualitative dependencies of the material microstructure changing and long-term strength, which defines structural materials durability and residue resource of object under operation.

The acoustic emission (AE) method is the most suitable for these changes recording. The AE reflects microstructure reconfigurations of structural materials under the impact of any loads, but calculations should account for the most informative AE signals from the defects, which are not recovered during further operation, with fractal dimension of attractor signal of 1 ≤ D2attr ≤ 6 .

The article considers technique of durability forecasting of the pipelines under the impact of low-cycle loads at different loading trajectories in the two-dimensional stress space in a plane stress-strain state employing the acoustic emission method. The problem of determining the high-pressure pipelines durability depends on the dangerous damages accumulation in the structural material of pipelines as the result of plastic deformations accumulated from low-cycle loads, characterized by high stresses, various cycle forms and loading trajectories. The residual life evaluation of the existing pipelines is currently based on the latest achievements in the field of fracture mechanics, metallurgy, non-destructive testing methods, and current design standards for strength and conditions of actual operation. The existing methods herewith do not account for microstructure evolution of the structural material in real time. The acoustic emission method allows accounting for transformation of the structural material microstructure in real time, and predict the residual life.

The proposed method allows significant reduction of the laboratory tests number for predicting the high-pressure pipelines durability under the impact of low-cycle loads at various loading trajectories.


durability, low-cycle loading, plane stress-strain state, loading path, high-pressure pipelines, acoustic emission


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