Effect of different atmospheres on the electrical contact performance of electronic components under fretting wear

Liu, Xin-long; Cai, Zhenbing; Cui, Yan; Liu, Shan-Bang; Xu, Xiaojun; Zhu, Minhao

doi:10.1088/1361-6463/aab30d

Cited by 18 publications

(4 citation statements)

References 44 publications

(47 reference statements)

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“…When oxidation wears these bumps down, their total area decreases resulting in increased contact resistance and decreased electrical conductivity [6] . Different working conditions cause varying degrees of material wear morphology affecting conductive properties differently [7] . quickly evaluating materials' electrical conductivity can be achieved using machine vision methods instead of human observation by segmenting worn mark morphology according to pixel distribution brightness color information and extracting different texture features combined with measuring contact resistance for determining component service life.…”

Section: Introductionmentioning

confidence: 99%

Research on electrical contact performance based on machine vision

Li,

Ou,

You

et al. 2024

International Conference on Algorithm, Imaging Processing, and Machine Vision (AIPMV 2023)

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The electrical connection serves as a vital and abundant link in power, electronic equipment, and systems, with the electrical contact acting as its core component. In practical working conditions, fretting wear occurs during the usage of electrical contacts, leading to surface destruction and a decline in their performance. Determining the degree of wear on electrical contacts is crucial for assessing their failure in engineering applications. This study focuses on conducting fretting wear tests on copper material under different cycles for electrical contacts while utilizing machine vision algorithms to detect the morphological characteristics of wear marks. Gray threshold segmentation is applied to extract texture features from wear marks after various oxidation conditions. Pseudocolorization techniques are employed to process extracted morphologies, followed by calculating their characteristic areas. Finally, combining these results with contact resistance curves allows for judging the electrical conductivity of the electrical contact under different cycles.

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Section: Introductionmentioning

confidence: 99%

Research on electrical contact performance based on machine vision

Li,

Ou,

You

et al. 2024

International Conference on Algorithm, Imaging Processing, and Machine Vision (AIPMV 2023)

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“…However, varied service environments (temperature, humidity, atmosphere, etc.) also play a role in in uencing current-carrying friction and wear in addition to operational conditions [8][9][10] . Taking the pantograph catenary system supplying current to high-speed train through sliding contact as an example, it is an open and complex current-carrying tribological system.…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

Ji,

Xiao,

et al. 2024

Preprint

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The environmental temperature alters the frictional behaviour by changing the state of the current-carrying contact interface, which makes the electrical contact invalid. In this work, the effects of three different temperatures (-20 ℃, 0, 20 ℃) on the current-carrying tribological behaviour of C-Cu tribo-pairs in high humidity environment (85%) were discussed. The evolution laws of friction coefficient, wear volume, contact surface properties, and contact resistance of C-Cu contact pairs under the coupling effect of temperature and current were studied, and the current- carrying wear mechanism of C-Cu at low temperature was analyzed in depth. The friction coefficient at each temperature exhibits a similar changing rule before and after current-carrying, demonstrating that the friction coefficient increases as temperature falls. However, the average friction coefficient at each temperature is lower than that without current. Although it will hasten the material surface's oxidation, a drop in ambient temperature will effectively lessen the transfer behavior of copper to carbon surface and reduce the wear volume of carbon material. The amount of copper transferred increases as current rises. Compared with the current, the change of temperature has a greater impact on the damage of tribo-pairs. At room temperature, the contact resistance under high current is greater than that of low current, the low temperature is just the opposite. In addition, at 0℃, although the contact resistance of low current (5 A) decreases significantly in the early stage of friction, its average resistance and fluctuation amplitude are the largest. As the temperature decreases, the current-carrying wear mechanism of C-Cu contact pairs gradually changes from adhesive wear to fatigue wear.

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“…Extensive experimental investigations focused on the fretting wear behavior of electrical contacts and its influence on ECR [10][11][12]. Based on common-used fretting testing equipment, the four-point method is widely used to measure the ECR of electrical contacts.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Coupled Electrical-Thermal-Mechanical-Wear Behavior in Electrical Contacts

Shen

2021

Metals

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Electrical contacts involve complicated electrical, thermal, and mechanical phenomena. Fretting wear as a surface damage mechanism significantly weakens the performance of electrical contact components. In this study, a numerical approach is developed to investigate the electrical-thermal-mechanical-wear coupling behavior of electrical contacts. An electrical contact conductance law is used with the current conservation model to evaluate the electrical behavior. A transient heat transfer model, including the Joule heating behavior and a thermal contact conductance law, is employed to calculate the temperature field. Both contact conductance laws are related to the contact pressure distribution obtained by the contact stress analysis. Based on the predicted contact stress and relative slip on contact surfaces, the energy wear model is used to study the evolution of fretting wear depth and contact surface geometry. The material properties in these models are temperature-dependent. The proposed numerical approach is implemented in a finite element modeling of electrical contacts, which is validated by comparing the predicted and experimental results of the wear scar profile. The effects of the fretting wear on the electric potential, current density, contact resistance, temperature, and contact pressure are numerically studied.

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Effect of different atmospheres on the electrical contact performance of electronic components under fretting wear

Cited by 18 publications

References 44 publications

Research on electrical contact performance based on machine vision

Research on electrical contact performance based on machine vision

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

Numerical Study of Coupled Electrical-Thermal-Mechanical-Wear Behavior in Electrical Contacts

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