Effect of waviness and roughness on cylinder liner friction

Author(s)

Tomanik, Eduardo ^[1] ; El Mansori, Mohamed ^[2] ; Souza, Roberto ^[1] ; Profito, Francisco ^[1]

Affiliation

^[1] Univ Sao Paulo, Polytech Sch, Surface Phenomena Lab LFS, Av Prof Mello Moraes 2231, BR-05508030 Sao Paulo, SP - Brazil

^[2] ENSAM, MSMP EA7350, 2 Tours Arts & Metiers, F-13617 Aix En Provence - France

• Document type: Journal article
• Source: TRIBOLOGY INTERNATIONAL; v. 120, p. 547-555, APR 2018.
• Web of Science Citations: 9

Abstract

The tribological performance of piston ring-cylinder bore was investigated through deterministic mixed lubrication modeling. Bore topographies measured from regular honed Gray Cast Iron (GCI) to ``Mirror-Like{''} coated bore surfaces were used in the investigation. In contrast with typical honed GCI bores composed of relatively well-distributed peaks and valleys, coated bores are composed of a much smoother plateau and localized deep pores. Simulation results indicated that coated bore surfaces generate significantly higher hydrodynamic pressure and lower asperity contacts when compared with regular GCI topographies. The influence of roughness filtering and the associated cut-offs values were also considered in the analysis, showing that the choice of cut-off affects both the predicted hydrodynamic and asperity contact pressures. Furthermore, the simulation results also revealed that most of the fluid pressure was generated by the honing grooves rather than by the localized pores present on coated bore surfaces. (AU)

• FAPESP's process: 09/54891-8 - Tribological challenges in flex-fuel engines
• Grantee: Roberto Martins de Souza
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)