Abstract
The objective of this study was to investigate the wear characteristics of the U-shaped rings of power connection fittings, and to construct a wear failure prediction model of U-shaped rings in strong wind environments. First, the wear evolution and failure mechanism of U-shaped rings with different wear loads were studied by using a swinging wear tester. Then, based on the Archard wear model, the U-shaped ring wear was dynamically simulated in ABAQUS, via the Umeshmotion subroutine. The results indicated that the wear load has an important effect on the wear of the U-shaped ring. As the wear load increases, the surface hardness decreases, while plastic deformation layers increase. Furthermore, the wear mechanism transforms from adhesive wear, slight abrasive wear, and slight oxidation wear, to serious adhesive wear, abrasive wear, and oxidation wear with the increase of wear load. As plastic flow progresses, the dislocation density in ferrite increases, leading to dislocation plugs and cementite fractures. The simulation results of wear depth were in good agreement with the test value of, with an error of 1.56%.
Highlights
"west–east power transmission" project in China, so the state grid of China has increased the construction of Xinjiang Ultra High Voltage (UHV) transmission lines [1]
The wear rate of the upper U-shaped ring is higher than that of the lower one, which demonstrates that the wear of the upper U-shaped ring is more serious than that of the lower U-ring
This phenomenon is consistent with the actual transmission line wear failure
Summary
Xinjiang plays an important role in the "One Belt And One Road" strategy and the "west–east power transmission" project in China, so the state grid of China has increased the construction of Xinjiang Ultra High Voltage (UHV) transmission lines [1]. The above scholars all studied the wear of the connection fittings through experimental methods, with the maximum wear number of up to 250,000 times, and a wear frequency of 1. Based on the above research content, the wear subroutine for connection fittings was written, and the wear simulation was carried out, which could greatly shorten the research time, and create a new method for the study of the wear of connection fittings. The wear test of the U-shaped rings of power connection fittings was carried out by using the swing wear tester to obtain the wear failure mechanism and damage law. Based on the generalized Archard wear model, Fortran language was used to write a wear subroutine for connection fittings, to simulate the wear depth of U-shaped rings dynamically
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