Abstract
Previous works have shown that fretting fatigue can be modelled as a notch problem due to the mild superficial damage produced in the partial slip regime during fretting. In this context, the aim of this numerical and experimental study is to estimate the fatigue life of aluminium 6201-T81 wires, used in overhead conductors, containing geometric discontinuities. These discontinuities induce a stress field analogous to the fretting problem. To perform the fatigue life assessments theLM-Nfrelationship, which is an extension of the Theory of Critical Distance (TCD), was applied. TheLM-Nfrelationship was calibrated using twoS-Ncurves, one of a plain wire and other of a notched wire. The validation of the numerical approach estimations was performed using a wire containing a through hole. The estimations were fallen almost entirely among factor 3 bands when compared with the experimental results. This factor 3 represents the biggest scatter in theS-Ncurves used to calibrate theLM-Nfrelation. The TCD approach applied, in terms of point method, provide accurate life estimations in the range 105and 106cycles.
Highlights
Failure in overhead conductor, used in power transmission lines, is mainly associated to the fretting fatigue
We present the results of fatigue test for the plain wire, notch wire and wire containing a through hole with diameter of 0.7 mm
The Line Method (LM)-Nf relationship, when calibrated with fatigue data from the plain wire and the notched wires, generated good life estimations for the wires containing through hole of 0.7 mm of diameter
Summary
Failure in overhead conductor, used in power transmission lines, is mainly associated to the fretting fatigue. The Aeolian vibration is caused by the vortices and these are formed alternately from the top and bottom of the conductor This vibration causes the cable to bend in the vicinity of a “rigid” device [5, 6]. The combination of the bending stress, the mean stretching load of the conductor and the clamping force generate complex mechanical interactions due to the relative movements between cable wires and between the cable external wires and the suspension clamp. Some of this interactions causes slip and high multiaxial stress state in the contact zones [4, 7]. The failure in the conductor is recognized as a fretting fatigue problem [8]
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