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Experimental and numerical investigations on size effect of friction in meso-/micro-forming without lubricant

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Abstract

The main purpose of this paper is to investigate the variation mechanism of tribological size effect in meso-/micro-forming processes. The effects of specimen size on friction behavior in meso-/micro-forming were investigated through the pure copper upsetting experiments without lubricant. It reveals that the friction coefficient on contact surface is getting smaller with the decreasing of specimen size. Then, the influence mechanisms of specimen size on friction behavior were studied by the combination of experimental and numerical methods. It indicates that as the specimen size decreases, the reducing friction coefficient is caused by the decreasing of normal pressure on contact surface in meso-/micro-forming processes without lubricant. The investigation results are very useful for predicting friction behavior in meso-/micro-forming processes without lubricant.

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Abbreviations

A :

Contact surface area of deformed specimen

A r :

Actual contact area of deformed specimen

D :

Specimen diameter

F n :

Forming force

k :

Shear yield strength

m c :

Shear film strength coefficient

n :

Strain hardening exponent

p :

Contact normal pressure

p ave :

Average normal pressure

R T :

Top radius of deformed specimen

R M :

Largest radius of deformed specimen

σ 0 :

Initial yield strength

σ :

Yield strength of material

α :

Real contact ratio (α = Ar/A)

τ :

Friction stress

μ :

Friction coefficient

θ :

Shape parameter

ΔH :

Specimen height reduction

H :

Initial specimen height

ΔH/H :

Height reduction ratio

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Funding

This study was supported by the National Natural Science Foundation of China, No. 51505256 and No. 51775311.

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Authors and Affiliations

  1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, Shandong, People’s Republic of China

    Juanjuan Han, Yao Lin & Guangchun Wang

  2. School of Materials Science and Engineering, Shandong Jianzhu University, Jinan, 250101, Shandong, People’s Republic of China

    Wei Zheng

Authors
  1. Juanjuan Han
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  2. Yao Lin
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  3. Wei Zheng
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  4. Guangchun Wang
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Correspondence to Wei Zheng or Guangchun Wang.

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Han, J., Lin, Y., Zheng, W. et al. Experimental and numerical investigations on size effect of friction in meso-/micro-forming without lubricant. Int J Adv Manuf Technol 106, 4869–4877 (2020). https://doi.org/10.1007/s00170-020-04959-x

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  • DOI: https://doi.org/10.1007/s00170-020-04959-x

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