Research Papers

Numerical Investigation of Adhesive Wear and Static Friction Based on the Ductile Fracture of Junction

[+] Author and Article Information
Aizhong Wu

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China

Xi Shi

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
State Key Laboratory of Mechanical Systems and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: xishi@sjtu.edu.cn

1Corresponding author.

Manuscript received August 21, 2012; final manuscript received November 21, 2012; accepted manuscript posted November 28, 2012; published online May 31, 2013. Editor: Yonggang Huang.

J. Appl. Mech 80(4), 041032 (May 31, 2013) (10 pages) Paper No: JAM-12-1407; doi: 10.1115/1.4023109 History: Received August 21, 2012; Revised November 21, 2012; Accepted November 28, 2012

Adhesion plays a significant role in the friction and wear in the case where the contact surfaces are continuous and smooth such that roughness-based factors are negligible. Therefore, imposing an external load to overcome the friction is, in essence, a failure process of adhesive junctions. In this work, a finite element model was developed in order to investigate the formation of adhesive wear particles and static friction based on the ductile fracture of junctions. Focusing on the cylindrical contact and the combined contact loading configuration, a modified element deletion method with three empiric fracture criteria was employed and the failed elements satisfying some fracture criterion were used to represent the cracks. Based on the different crack development stages, a qualitative adhesive wear mechanism was summarized. The simulation results indicate that the secondary crack initiated in the pile-up of material possibly accounts for the crack kinking, which is the origin of the flake-like wear particle. Friction behaviors under different loading configurations were investigated and a simple comparison for three different fracture models was presented. It was found that all three models show the same trend of friction decreasing with the increase of normal preload. Where the most conservative Bao–Wierzibicki (BW) fracture model predicts higher friction compared to two other fracture models, the Johnson–Cook (JC) model predicts a lower ductile fracture strain, thus the ductility of the material is relatively underestimated.

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Fig. 1

(a) Spherical contact under normal loading, and (b) combined normal and tangential loading

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Fig. 2

Finite element model for 2D cylindrical contact

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Fig. 3

Loading rate dependent normal contact parameter: (a) dimensionless reaction force, and (b) dimensionless contact pressure

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Fig. 4

(a) Dimensionless tangential force versus dimensionless tangential displacement under different tangential loading rates, and (b) the ratio between the kinetic energy (ALLKE) and the strain energy (ALLSE) during tangential loading with a loading rate of 0.1 m/s

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Fig. 5

Development of the fracture initiation criterion (the SBL model) during tangential loading (ω = 3.5ωc)

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Fig. 6

Simulated wear particle, kinked crack with the (a) SBL model, (b) JC model, and (c) BW model (ω = 3.5ωc)

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Fig. 7

Formation of a flake-like wear particle under combined normal and tangential loading

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Fig. 8

Fracture initiation criterion for a low normal preload of 1ωc: (a) the BW model, (b) the SBL model, and (c) the JC model

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Fig. 11

Predicted static friction coefficient with different fracture criteria

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Fig. 10

Dimensionless tangential force versus dimensionless tangential displacement: (a) ω = 3.5ωc, and (b) ω = 1ωc

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Fig. 9

Sliding inception characterized by the damage energy dissipation



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