Analysis of mechanical properties of large particles in contact process and their impact on powder lubrication

Abstract

Impurities or wear particles are almost impossible to avoid during powder lubrication. This condition causes three-body contact with rough surfaces in the condition of mixed in large particles. The mechanical properties of large particles in the process of powder lubrication are analysed in this study by combining the caulking effect, covering effect and three-body elastic contact model. The relationship and influencing factor between load and the contact area and the separation between the two surfaces in the presence of a third body are determined. Furthermore, the impact of large particles on the lubricating effect is analysed. Experiments are conducted to observe the destruction of the powder layer of friction, the impact of large particles and specific forms of damage.

Keywords

Rough surface Powder lubrication Larger particles

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References

Godet

: ‘The third body approach: a mechanical view of wear’, Wear, 1984, 100, (1-3), 437–452.

Xiaoming

, Fei

and Rong

: ‘Advances in materials’ friction characteristics of the three-body system’, Prog. China Mater. Sci., 2009, 28, (2), 8–13.

Johnson K

: ‘Contact mechanics’; 1985, Cambridge, Cambridge University Press.

Greenwood

and Williamson

JBP

: ‘Contact of nominally flat surfaces’, Proc. R. Soc., 1966, A295, 300–319.

Greenwood J

and Tripp J

: ‘The contact of two nominally flat rough surfaces’, Proc. Inst. Mech. Eng., 1970, 625–633.

Majumdar

and Bhushan

: ‘Fractal Model of Elastic plastic Contact Between Rough Surfaces’, J. Tribol., 1991, 113, l–11.

Heshmat

: ‘The quasi-hydrodynamic mechanism of powder lubrication—part III: on theory and rheology of triboparticulates’, Tribol. Trans., 1995, 382, 269–276.

Wei

, Xiaojun

and Wei

: ‘Studies of liquid–solid two-phase fluid lubrication considering the impact of the particle distribution’, Chin. Mech. Eng, 2007, 18, (24), 2993–2996.

Wei

, Xiaojun

and Kun

: ‘Effects of particle size and its distribution on the granular media friction's tribological properties’, Chin. Mech. Eng, 2012, 23, (7), 757–761.

10.

Fengbi

and Youbo

: ‘The research of third body contact theory’, Chin. J. Mech. Eng., 1977, 33, (3), 27–31.

11.

Avcu

, Fidan

, Yildiran

and Sınmazcelik

: ‘Solid particle erosion behaviour of Ti6Al4V alloy’, Tribology, 2013, 7, (4), 201–210.

12.

Kabir

, Lovell MR and Higgs

: ‘Utilizing the explicit finite element method for studying granular flows’, Tribol. Lett., 2008, 29, (2), 85–94.

13.

Kabir

, Jasti

, Higgs

and Lovell MR : ‘An evaluation of the explicit finite element method approach for modelling dense flows of discrete grains in a Couette shear cell’, Proc. Inst. Mech. Eng. J. Eng. Tribol., 2008, 222, (6), 715–723.

14.

Heshmat

: ‘The rheology and hydrodynamics of dry powder lubrication’, Tribol. Trans., 1991, 34, (3), 433–439.

15.

Higgs

and Wornyoh

EYA

: ‘An in situ mechanism for self-replenishing powder transfer films: experiments and modeling’, Wear, 2007, 264, 131–138.

16.

Wei

, Xiaojun

and Kun

: ‘The analysis of powder layer's microscopic failure modes and mechanisms on the process of lubrication’, Tribology, 2012, 32, (3), 258–263.