Abstract
In order to investigate the relationship between tribo-magnetization and wear phenomena, a series of sliding-friction tests were carried out using a pin-on-block reciprocator type device, which was specially designed to generate sliding friction and to detect magnetic fields. The tribological behavior was observed by a charge-coupled device (CCD) camera in real time, and the magnetic signal was detected by using a two-axis magnetic sensor. It was found that as the friction continues, both the tangential and the normal components of magnetic field on the material surface increase gradually, and that both the average value of the tangential magnetic field ΔH(x)mean and the peak-to-peak value of the normal magnetic field Vpp at the wear scar clearly reflect changes of the wear state. Furthermore, in order to better understand the tribo-magnetization phenomenon, the changes of surface morphology and wear debris in different wear stages were analyzed. Moreover, an improved magnetic dipole model that considered the distribution of magnetic charges on the worn surface was established. This model can successfully describe the tribo-magnetization phenomenon during the stable wear stage, and should be useful for characterizing frictional wear phenomena in the future.
Highlights
In order to investigate the relationship between tribo-magnetization and wear phenomena, a series of sliding-friction tests were carried out using a pin-on-block reciprocator type device, which was specially designed to generate sliding friction and to detect magnetic fields
The purpose of this paper is to further study the variation of a magnetic field on a sample surface during reciprocating sliding, and to reveal the relationship between tribo-magnetization and wear state
In the following analysis, the mean value of the tangential magnetic field increment in the wear scar is proposed to characterize the changes of the magnetic field
Summary
Friction and wear are among the most common natural phenomena in our lives, and the main cause for the failure of moving parts. Tribo-magnetization is a common phenomenon in friction, and has been studied to evaluate wear states [6,7]. Y. Chang has investigated that the effects of sliding speed and normal load on the surface magnetization mechanisms of self-mated iron pairs under the dry severe wear process, and has concluded that severe friction phenomena are the prerequisite conditions for tribo-magnetization [11]. We have carried out a series of studies of the phenomenon of reciprocating friction magnetization under the condition of dry friction, studied the influence of the initial magnetic field, normal load and sliding speed on the tribo-magnetic effect with and without geomagnetic shielding, and found that the surface magnetic field at the wear scar position can be used to evaluate the wear state [14,15]. The simulation results prove to be in remarkable agreement with the actual results
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