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Wear and Lubrication Behaviors of Cu-Based Friction Pairs with Asperity Contacts: Numerical and Experimental Studies

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Abstract

This paper aims to investigate the wear and lubrication behaviors of wet Cu-based friction pairs. A mixed lubrication model in plane contacts is developed, and the tests of pin-on-disk are carried out. Wear losses are measured by the oil spectrum analysis method. The wear loss, the real contact area ratio, and the load sharing ratio are analyzed. Effects of sliding velocity, temperature, and pressure are considered. The results show that the temperature is the most significant influence on the wear loss of lubricated Cu-based friction pairs. As the temperature rises from 30 to 150 °C, wear loss increases from less than 0.4 mg to about 2.3 mg. The wear factor of the lubricated Cu-based friction pair in asperity contact areas is \(K_{c} = 9.4 \times 10^{ - 9}\) (g/Nm). When the lubricated wear is slight, the oil spectrum analysis method is an effective approach to accurately determine the wear loss.

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Abbreviations

a :

Half length of solution domain

A :

Nominal contact area

A c :

Real contact area

c s :

Specific heat capacity

E :

Young’s modulus

E′ :

Effective Young’s modulus

h :

Local film thickness

h a :

Average central film thickness

h o :

Minimum local film thickness

L :

Load

L l :

Load supported by hydrodynamic film

L c :

Load supported by asperity contacts

p l :

Hydrodynamic pressure

p c :

Asperity contact pressure

R a :

Asperity height

S q :

Root mean square (RMS) surface roughness

T :

Local Kelvin temperature

ΔT :

Local temperature rise

u :

Relative sliding velocity

ξ :

Surface deformation

W :

Wear loss

x, y :

Coordinates

α s :

Thermal diffusivity

ϕ A :

A c /A, contact area ratio

ϕ L :

L c /L, load sharing ratio of asperity contact

η :

Lubricant viscosity

η o :

Ambient lubricant viscosity

λ :

h a /σ, film thickness ratio

ρ :

Density of lubricant

ρ o :

Ambient density of lubricant

υ :

Poisson’s ratio

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Acknowledgements

Funding was provided by National Natural Science Foundation of China (Grant No. 51575042).

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Authors and Affiliations

  1. Beijing Institute of Technology, Beijing, China

    Er-Hui Zhao, Biao Ma & He-Yan Li

  2. Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, China

    Biao Ma & He-Yan Li

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  1. Er-Hui Zhao
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  2. Biao Ma
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Correspondence to He-Yan Li.

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Zhao, EH., Ma, B. & Li, HY. Wear and Lubrication Behaviors of Cu-Based Friction Pairs with Asperity Contacts: Numerical and Experimental Studies. Tribol Lett 65, 69 (2017). https://doi.org/10.1007/s11249-017-0852-6

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