Effect of elevated temperature on fretting wear under electric contact

Liu, Xin-long; Cai, Zhenbing; He, Junping; Peng, Jinfang; Zhu, Minhao

doi:10.1016/j.wear.2017.02.036

Cited by 27 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a power and signal transmission system, the reliability, stability, accuracy, and service life of the system depend on the electrical contact materials [2,3]. Most of the electrical contacts are permanent connections, however, the relative motion of the contacts still occur owing to changing vibrations and temperatures because of the different thermal expansion coefficients of the electrical contacts [4][5][6]. Researchers have focused on the electrical conductivity and wear resistance of sliding contact components.…”

Section: Introductionmentioning

confidence: 99%

Conductive and tribological properties of TiN-Ag composite coatings under grease lubrication

2020

View full text Add to dashboard Cite

TiN-Ag composite coatings were prepared by pulsed bias arc ion plating. X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS) were applied to analyze the compositions of the coatings. Tribological properties of the coatings were studied using an MFT-R4000 ball-on-disk friction tester in the presence of lubricating greases containing multilayer graphene. Scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used to analyze the worn surface compositions of the lubricating films. The results show that with the decrease in Ag in the film, hardness increased but electrical conductivity decreased. The coating with 10 at% Ag content shows the best friction-reducing and anti-wear properties, which can be attributed to the moderate content of Ag embedded in the TiN crystal gap that enhanced the grain bonding force to improve the anti-wear and self-lubricating ability. Graphene can be adsorbed on the coating as a solid lubricant.

show abstract

Section: Introductionmentioning

confidence: 99%

Conductive and tribological properties of TiN-Ag composite coatings under grease lubrication

2020

View full text Add to dashboard Cite

show abstract

“…A preload is applied to clamps to form good contact, and the ECR and TCR are calculated based on pressure and temperature. During powering on, the HGR of clamps is calculated based on equation (1), and the heat flow density is computed based on equation ( 2) to obtain the temperature distribution. The elevated temperature affects the material properties to change the contact state in the mechanical field and also affects the electrical conductivity in the electrical field, thereby further influencing the current density and HGR distribution.…”

Section: Multi-field Coupling Mechanismmentioning

confidence: 99%

“…Thus, some researchers have carried out experimental and numerical studies on wear to reveal the failure mechanism of the electrical contact interface. 1,2 Available findings provide important theoretical support for the performance optimisation and life extension of electrical connectors. However, the numerical simulation of electrical connectors adopts a simplified model and ignores the effect of surface morphology.…”

Section: Introductionmentioning

confidence: 97%

Numerical study on thermal-electrical-mechanical coupling mechanism of electrical connectors considering contact resistance

Feng

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Electrical connectors are widely used in electromechanical equipment. Their rough surfaces inevitably induce electrical contact resistance (ECR) and thermal contact resistance (TCR), which generates a significant influence on electricity and heat conducting at the faying surface and affects the accuracy of the thermal-electrical-mechanical coupling (TEMC) numerical calculation. Thus, a TEMC model with ECR and TCR of a parallel groove clamp is necessary to investigate the TEMC mechanism. Firstly, appropriate ECR and TCR models are created based on the available experimental results. Secondly, a refined TEMC finite element model is established by optimising the mesh size at the faying surfaces, and the cyclic coupling calculation method is adopted to achieve efficient and consistent numerical calculations. Meanwhile, the validity of the simulation model is verified by experimental results. Finally, the transient real contact area, current density, and heat generation rate (HGR) are obtained to analyse the TEMC mechanism during temperature rise. The results indicate that the mechanical characteristics during temperature rise are different under two loading conditions of tight and loose, thereby resulting in different changing laws in terms of the maximum current density and HGR. In addition, two coupling mechanisms exist until the steady-state temperature is achieved.

show abstract

“…The effect of temperature on fretting wear cannot be ignored. Temperature not only will affect the change in geometric shape of the friction pair but also the contact characteristics between the friction surfaces [20][21][22]. Srivastava et al [23] proposed a finite element-based fretting and fretting fatigue prediction method for compression shafts.…”

Section: Introductionmentioning

confidence: 99%

Fretting Wear and Lubrication Characteristics of the Steel Ring of a Metal Belt-Type Continuously Variable Transmission

Han

Zhao

Cao

et al. 2022

Preprint

View full text Add to dashboard Cite

The multi-field coupling mechanism of a continuously variable transmission (CVT) system has a greater impact on its overall friction loss. The friction loss of steel rings represents the internal loss of the metal belt occurring between the steel ring group and friction plate, and it is the main reason for the loss of CVT energy. This study is based on the dissipative wear model of the CVT steel ring friction pair, and it innovatively establishes a steel ring wear depth model that relates the wear depth to the macro- and micro-factors. Here, a mixed lubrication model between the friction pairs of steel rings is constructed, and the change law of oil film thickness, pressure, and temperature between the contacting bodies is obtained. On the basis of the wear depth model of the steel ring, the results of the wear depth of the steel ring are obtained via simulation using torque, speed, fretting frequency, and other operating parameters. The surface wear of the steel ring at different fretting frequencies is observed via SEM, and the simulation and test results are compared. Subsequently, the obtained results of the wear depth and oil film thickness tests are used to determine the safety margin of the application efficiency of the steel ring friction pair in the CVT working range via the interpolation processing method. According to the simulation results, the overall performance area of the safety margin of the application efficiency of the steel ring friction pair is between −1 and 1. When the torque is greater than 130 N•m, the safety margin value decreases below 0, the safety failure probability of the steel ring increases significantly, and the safety margin decreases gradually. This research can provide new insights into solving the reliability and service life of CVTs.

show abstract

Effect of elevated temperature on fretting wear under electric contact

Cited by 27 publications

References 11 publications

Conductive and tribological properties of TiN-Ag composite coatings under grease lubrication

Conductive and tribological properties of TiN-Ag composite coatings under grease lubrication

Numerical study on thermal-electrical-mechanical coupling mechanism of electrical connectors considering contact resistance

Fretting Wear and Lubrication Characteristics of the Steel Ring of a Metal Belt-Type Continuously Variable Transmission

Contact Info

Product

Resources

About