Abstract
This paper presents a biaxial fretting fatigue test bench which provides the capability of performing fretting fatigue experiments on individual wires of a conductor combining the effect of both alternating tension and bending loadings to represent a more realistic state of a conductor individual strand under periodic loading caused by aeolian vibrations. Preliminary tests with only uniaxial alternating tension loading were carried out on 1350-H19 aluminum wires having the same mechanical and geometric characteristics as those of the ACSR Bersfort conductor aluminum strands. Different levels of alternating stress were tested in order to validate the performance of the apparatus. Preliminary results showed that the experimental setup allows reproducing the local loading state which leads to the fretting fatigue damage on the tested wires. Biaxial tests were also conducted at a high level of alternating loadings. The results of these tests reveals that, at high alternating stress amplitudes, the biaxial loading allows to observe some fretting fatigue failures, whereas early plain fatigue failures were observed when applying similar uniaxial loading.
Highlights
The knowledge of the performance over time of overhead conductors requires the creation of a series of tools to evaluate their fatigue strength
The method of fatigue testing of overhead conductors is well explained at the global scale from an experimental point of view in IEC 62568 international standard [1], fatigue test results are mainly available for ACSR conductors and there are only few results available for other conductor types [2]
The design of a biaxial fretting fatigue test bench has been presented in this paper
Summary
The knowledge of the performance over time of overhead conductors requires the creation of a series of tools to evaluate their fatigue strength. The numerical model of a clamp/conductor system developed by LALONDE [3] takes into account inter-wire and clamp wire contacts in a stranded conductor and provides a more realistic description of the local loading state. It has been shown, based on the experimental results of LÉVESQUE tests [4], that this numerical approach is capable of evaluating the state of local solicitation in terms of stress and strain at any point of the conductor, which makes it possible to locate the critical zones that are susceptible to failure. The combined effect of these two loading parameters may need to be taken into consideration to better describe the stress state that leads to wires failure
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