Microscopic modeling on tribological behaviors of seal composites for aiding the selection of sealing material in a wet clutch

Abstract

A numerical method is proposed to investigate the tribological behaviors of three sealing composite materials based on the movable cellular automata (MCA). The MCA method is a discrete approach that treats a simulated medium like an ensemble of interacting cellular automata. These sealing materials are applied to the seals that are assembled in the wet clutch of an automobile. Polytetrafluoroethylene (PTFE) matrix materials with different proportions of the same filler materials are chosen as samples in this study. Based on the discretization concept, this study visualizes the microscopic dynamic responses, formation and evolution of the frictional layer of sealing material surfaces, by considering properties of filler materials and material inhomogeneity in the composites of the seals. The changing processes of friction coefficients and worn automata are obtained within the simulation time. PTFE composites with sealing ring configurations are tested in the test rig. Scanning electron microscopy is utilized to examine composite microstructures, and the results indicate that microstructure wear mechanisms are consistent with MCA simulations. The nature of filler material is investigated and the wear patterns of PTFE materials are revealed through the MCA method, which provides an option for sealing material selection and will improve the efficiency of the sealing design in the wet clutch.

Keywords

Wet clutch sealing ring microstructure friction polytetrafluoroethylene composite

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References

Cui

. Friction and wear behavior of bronze matrix composites for seal in antiwear hydraulic oil. Tribol Trans 2015; 58: 51–58.

Choi

Park

Lee

et al . Analysis on the mechanical characteristics of PTFE oil seal for the rear part in the automotive engine. Int J Precis Eng Man 2011; 12: 485–490.

Abubakar

Myler

Zhou

. Constitutive modelling of elastomeric seal material under compressive loading. Model Numer Simul Mater Sci 2016; 6: 28–40.

Ahmed

Shafy

El-Megeed

et al . The effect of γ-irradiation on acrylonitrile–butadiene rubber NBR seal materials with different antioxidants. Mater Des 2012; 36: 823–828.

Gronitzkiand

Poll

GWG

. Optimization of the tribological performance of rectangular seals in automotive transmissions. Proc IMechE Part J J Eng Tribol 2007; 221: 259–270.

Liu

Zhao

Wen

et al . On frictional performance of sintering materials used by mechanical seals in water. Ind Lubr Tribol 2014; 66: 23–30.

Sefkow

Maciejewski

Klamecki

. Improving the long-term performance of elastomeric seals by material behavior design. J Tribol 2009; 131: 042203: 1–9.

Jones

Arnell

Kelly

. On the potential of CVD diamond films as mechanical seal face materials. Tribol Trans 2008; 51: 33–43.

Thakare

Mason

Owen

et al . Effect of sliding speed and counterface properties on the tribo-oxidation of brush seal material under dry sliding conditions. Tribol Int 2016; 96: 373–381.

10.

Cao

Zhang

Zou

et al . Sealing performances research on PTFE rotating seal under deep-Sea environment. Open Mech Eng J 2015; 9: 475–482.

11.

Yang

Jin

et al . Frictional behavior investigation on three types of PTFE composites under oil-free sliding conditions. Ind Lubr Tribol 2009; 61: 254–260.

12.

Trabelsi

Kharrat

Dammak

. Impact of lubrication on the tribological behaviour of PTFE composites for guide rings application. Bull Mater Sci 2016, 39: 1205–1211.

13.

Mnif

Jemaa

MCB

Kacem

et al . Impact of viscoelasticity on the tribological behavior of PTFE composites for valve seals application. Tribol Trans 2013; 56: 879–886.

14.

Shen

Khonsari

Spadafora

et al . Tribological performance of polyamide-imide seal ring under seawater lubrication. Tribol Lett 2016; 62: 1–9.

15.

Zhao

Wei

Yuan

et al . Theoretical and experimental study of cavitation effects on the dynamic characteristic of spiral-groove rotary seals (SGRSs). Tribol Lett 2016; 64: 50–67.

16.

Mazza

Belforte

. Analytical/experimental study of the contribution of individual seals to friction force in pneumatic actuators. J Tribol 2017; 139: 022202: 1–10.

17.

Minet

Brunetière

Tournerie

. A deterministic mixed lubrication model for mechanical seals. J Tribol 2011; 133: 042203: 1–11.

18.

Wenk

Stephens

Lattime

et al . A multi-scale finite element contact model using measured surface roughness for a radial lip seal. Tribol Int 2016; 97: 288–301.

19.

Man

Zhou

Tao

et al . Micro-scale numerical simulation on metal contact seal. Proc IMechE Part C J Mech Eng Sci 2013; 228: 2168–2177.

20.

Achenbach

. Service life of seals–numerical simulation in sealing technology enhances prognoses. Comput Mater Sci 2000; 19: 213–222.

21.

Ayadi

Brunetière

Tournerie

et al . Experimental and numerical study of the lubrication regimes of a liquid mechanical seal. Tribol Int 2015; 92: 96–108.

22.

Chen

Liu

. The effect of the O-ring on the end face deformation of mechanical seals based on numerical simulation. Tribol Int 2016; 97: 278–287.

23.

Nyemeck

Brunetière

Tournerie

. A multiscale approach to the mixed lubrication regime: application to mechanical seals. Tribol Lett 2012; 47: 417–429.

24.

Shi

Salant

. Numerical study of a rotary lip seal with a quasi-random sealing surface. J Tribol 2001; 123: 517–524.

25.

Geng

Wei

. Multiscale molecular dynamics using the matched interface and boundary method. J Comput Phys 2011; 230: 435–457.

26.

Renouf

Cao

Nhu

. Multiphysical modeling of third-body rheology. Tribol Int 2011; 44: 417–425.

27.

Liu

Chu

Hou

et al . Micromechanical damage modeling and multiscale progressive failure analysis of composite pressure vessel. Comput Mater Sci 2012; 60: 137–148.

28.

Jia

Fang

Liu

et al . A molecular dynamics investigation into the mechanisms of subsurface damage and material removal of monocrystalline copper subjected to nanoscale high speed grinding. Appl Surf Sci 2014; 303: 331–343.

29.

Stachowiak

Podsiadlo

. Classification of tribological surfaces. Tribol Int 2004; 37: 211–217.

30.

Wolski

Podsiadlo

Stachowiak

et al . Multiscale characterisation of 3D surface topography of DLC coated and uncoated surfaces by directional blanket covering (DBC) method. Wear 2017; 388–389: 47–56.

31.

Gong

Liu

Zhang

et al . Experimental investigation on frictional behavior and sealing performance of different composites for seal application. Wear 2015; 342–343: 334–339.

32.

Gong

Wan

Zhang

. Tribological properties and failure analysis of PTFE composites used for seals in the transmission unit. J Wuhan Univ Technol 2013; 28: 26–30.