Damage on Sliding Electrical Contact Interface With Considering Velocity Skin Effect

Abstract

In the process of sliding electrical contact, the current would cluster locally under the effect of velocity skin effect (VSE) and complex damage on the contact interface would occur under the coupling effect of Joule heat, frictional heat, and high-speed impact, which would seriously affect the safety and stability of sliding electrical contact systems. In this article, a modified smoothed particle hydrodynamics (SPHs) method is introduced into the study of the damage to the sliding electrical contact interface while considering the VSE in the process of sliding electrical contact. First, the magnetic induction equation is introduced into the SPH method. Then, the distribution characteristics of multiple physical fields are simulated, and the effects of velocity while considering the VSE are analyzed. Furthermore, considering the nonuniform distribution of current caused by the VSE, the effects of the vertical velocity of the slider on the characteristics of gouge damage are studied. The results show that in the process of sliding electrical contact, the magnetic field and current would gather on the sliding electrical contact interface and thus lead to a concentrated temperature rise at the end of the slider. Additionally, the greater the velocity of the slider, the more obvious the VSE becomes. The results also show that the vertical velocity plays a vital role in the morphology of gouge crater. When the vertical velocity is relatively high, a new gouge crater may appear based on the original damage. The critical vertical velocity that would induce gouge damage is also discussed in this article.